AARON, J.

Roxborough, Pomerance, Nye & Adreani, Edward D. Pomerance, Vincent S. Gannuscio and David R. Ginsburg, Woodland Hills, for Defendant and Appellant.

Anthony Lewis, Noah Graff, R. Timothy O'Connor, Eric P. Jones, Pleasanton, Tony M. Chang, Pasadena, and Seaton Tsai for Plaintiff and Respondent.

AARON, J. I.

INTRODUCTION

Defendant ReadyLink Healthcare, Inc. (ReadyLink) is a nurse staffing company that places nurses in hospitals, typically on a short-term basis. Plaintiff State Compensation Insurance Fund (SCIF) is a public enterprise fund created by statute as a workers' compensation insurer. Like private workers' compensation insurers, SCIF provides workers' compensation insurance to employers. The premiums that SCIF charges are based in part on the employer's payroll for a particular insurance year.

SCIF and ReadyLink have been engaged in a multiyear, multijurisdictional dispute over the final amount of workers' compensation insurance premium that ReadyLink owes to SCIF for the 2005 policy year, from September 1, 2005 to September 1, 2006, based on an audit of ReadyLink's payroll for that year performed by SCIF. During the audit, SCIF determined that certain payments made by ReadyLink to its nurses, which ReadyLink characterized as per diem payments, should instead be considered to be payroll under the relevant workers' compensation regulations. SCIF's audit resulted in a significant increase in ReadyLink's premium for the policy year at issue.

ReadyLink challenged SCIF's application of the regulations by filing an appeal of the audit to the Insurance Commissioner. The Insurance Commissioner approved SCIF's application of the relevant regulation. A trial court rejected ReadyLink's petition for a writ of administrative mandamus to prohibit the Insurance Commissioner from enforcing its decision, and an appellate court affirmed the trial court's judgment.

SCIF subsequently filed the action underlying this appeal, pleading causes of action including breach of contract, and seeking a judgment for damages against ReadyLink for its failure to pay the additional premium amount that SCIF had calculated was owed pursuant to its audit of ReadyLink's 2005 policy year payroll. ReadyLink answered SCIF's complaint and asserted a number of affirmative defenses, including estoppel, waiver, and fraud. ReadyLink was later granted leave to file an amended answer, in which it provided additional factual allegations supporting its affirmative defenses.

SCIF moved for judgment on the pleadings, claiming that the issue of the premium that ReadyLink owed for the 2005 policy year had been previously determined in the administrative proceeding and had been affirmed by subsequent judicial review of the administrative decision, and further claiming that issues related to ReadyLink's affirmative defenses had also been litigated in the prior proceedings. The trial court agreed with SCIF and concluded that SCIF's "action was necessary to reduce SCIF's claim to the premium owed to a judgment," and that "[t]he amount owed is precisely what was determined in the underlying administrative decision and appeals." The trial court granted SCIF's motion for judgment on the pleadings and entered a judgment in favor of SCIF in the amount of $555,327.53, plus prejudgment interest of $571,606.99.

On appeal, ReadyLink contends that the trial court erred in granting SCIF's motion for judgment on the pleadings, and also asserts that the trial court erred in denying ReadyLink's motions to compel further discovery responses from SCIF. According to ReadyLink, the trial court erred in concluding that the amount of premium it owes SCIF for the 2005 policy year was determined in prior proceedings. ReadyLink concedes that it previously litigated and lost its challenge to SCIF's decision to include per diem amounts as payroll for the 2005 insurance year, but argues that it has never had the opportunity to challenge whether SCIF otherwise properly calculated the premium amount that it claims is due, pursuant to the terms of the contract between the parties, or whether SCIF's past conduct, which ReadyLink alleges includes SCIF's acceptance of ReadyLink's exclusions of its per diem payments from payroll in prior policy years and SCIF's exclusion of per diem amounts in paying out on workers' compensation claims filed by ReadyLink employees, might bar SCIF from being entitled to collect that premium amount under the contract.

We agree with ReadyLink that the trial court erred in granting SCIF's motion for judgment on the pleadings. A full review of the collateral administrative and judicial proceedings demonstrates that ReadyLink and SCIF have not previously litigated the vast majority of issues raised by SCIF's action seeking to collect additional premium amounts from ReadyLink, and further reveals that those issues could not have been litigated in the administrative action. We therefore reverse the judgment, as well as the court's interlocutory order denying ReadyLink's motion to compel further discovery responses from SCIF. We remand the matter for further proceedings.

II.

FACTUAL AND PROCEDURAL BACKGROUND

A. Factual background

1. Background regarding ReadyLink and its payments to its nurse employees

Appellant ReadyLink is a nurse staffing company based in Thousand Palms, California. It contracts with registered nurses, licensed vocational nurses, and certified nursing assistants from throughout the United States and places them at hospitals. During the relevant time period, ReadyLink paid its nurses an hourly wage and, with respect to its California nurses for whom the workers' compensation insurance is at issue in this case, also paid a "per diem" amount. The per diem component that ReadyLink relied on in paying its nurses was calculated using location-specific federal tables, known as "CONUS" tables. ReadyLink pays the per diem to nurses as an expense, which is taken from its general and administrative account, rather than as payroll.

2. SCIF's role as ReadyLink's workers' compensation insurer

SCIF is a public enterprise fund, created pursuant to Insurance Code section 11770 et seq., as a workers' compensation insurer. In September 2000, ReadyLink applied for workers' compensation insurance through SCIF, and SCIF issued a policy to ReadyLink. ReadyLink's workers' compensation policy with SCIF was renewed annually until ReadyLink cancelled its coverage with SCIF in February 2007.

Pursuant to the terms of the insurance policy, at the end of each policy year, SCIF was permitted to audit ReadyLink's payroll records to determine the amount of wages that ReadyLink had paid to its employees that year, and to use that amount to determine the final premium owed. Workers' compensation insurers report the results of such audits to the Workers' Compensation Insurance Rating Bureau (WCIRB), which uses the data supplied to support its classification and rating systems. ( ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1169, 148 Cal.Rptr.3d 881.) SCIF conducted routine audits for ReadyLink's 2001, 2002, 2003, and 2004 policy years. In each of those years, SCIF did not question ReadyLink's use of the per diem payment system, thereby essentially permitting ReadyLink to exclude the per diem payments from its payroll calculation for purposes determining the amount of its premium. According to a declaration submitted by ReadyLink's Executive Vice President, during these policy years, SCIF paid out workers' compensation benefits to ReadyLink's injured employees and excluded the per diem amounts when calculating salary replacement.

3. SCIF's audit of the 2005 policy year and invoice for additional premiums based on the inclusion of per diem payments as payroll

SCIF began its audit of ReadyLink's 2005 policy year in January 2007. During the audit of the 2005 policy year, SCIF requested from ReadyLink information regarding its per diem program. A senior auditor in SCIF's "[S]pecial [R]isk [D]ivision" had noticed that ReadyLink was paying its nurses a minimum wage of approximately $6.75 an hour and providing them with unusually high stipulated per diem amounts. This senior auditor had conducted dozens of audits of nurse staffing agencies and registries and had never before seen a nurse staffing agency pay more than 50 percent of its remuneration to nurses in the form of per diem payments; nor had she seen a nurse staffing agency pay its nurses hourly wages that were significantly below the average hourly rate that was typically paid to nurses who were trained, licensed, and registered nurses in California. ( ReadyLink Healthcare, supra , 210 Cal.App.4th at 1170, 148 Cal.Rptr.3d 881.) The auditor questioned ReadyLink regarding its per diem payments and requested documentation to substantiate that the per diem payments met the standards for such payments set forth in the USRP. ReadyLink responded to SCIF's inquiries by stating that ReadyLink was in compliance with federal per diem guidelines. ReadyLink provided no additional documentation to SCIF regarding its per diem payment program.

SCIF provided ReadyLink with its final audit for the 2005 policy year in June 2007. The audit categorized ReadyLink's per diem payments to nurses during the policy year as payroll for reporting purposes, and included the per diem amounts in calculating ReadyLink's final premium for the policy year. SCIF determined that with the per diem payments included as payroll, ReadyLink owed more than $550,000 in additional premium payments for the 2005 policy year.

4. ReadyLink's appeal of SCIF's decision to include the per diem amount as payroll in calculating ReadyLink's 2005 premium to the Department of Insurance

ReadyLink disputed SCIF's decision to include the per diem amounts as payroll under the USRP rules, and SCIF referred the dispute to its internal customer assistance program. ( ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1170, 148 Cal.Rptr.3d 881.) SCIF's internal customer assistance program "requested that ReadyLink provide ‘verifiable documentation’ of the per diem payments, in the form of ‘invoices, receipts and other third-party paperwork’ showing reimbursement for ‘travel expenses, lodging, food expenses, and the like.’ " ( Ibid. ) "ReadyLink did not provide any documentation" in response to this request. ( Ibid. ) In the absence of documentation to support ReadyLink's assertion that the per diem payments were made to reimburse nurses for their travel expenses while away from home, rather than having been made to compensate them for their nursing services, SCIF's internal customer assistance program determined that the per diem amounts were properly included in the adjusted premium calculation for the 2005 policy year. ( Ibid. ) In April 2008, ReadyLink appealed SCIF's audit decision to include per diem amounts as payroll to the California Department of Insurance (DOI appeal). The issue to be decided in that appeal, as stated by the ALJ, was: "For policy year 2005, did SCIF properly include per diem payments made to registry nurses as ‘payroll’ or ‘remuneration’ pursuant to USRP, Part 3, Section V?" As explained by the ALJ, the USRP defines per diem payments as "reimbursement for additional living expense by virtue of job location." The ALJ further explained that these amounts "shall not be considered payroll if ‘the amount is reasonable and the employer's records show that the employee worked at a job location that would have required the employee to incur additional expenses not normally assumed by the employee.’ " The ALJ noted that whether SCIF could properly include ReadyLink's per diem payments as payroll constituted a question of first impression.

The DOI appeal proceeded through discovery, and the ALJ conducted a three-day hearing on March 25–27, 2009. After the hearing, and after considering the parties' posthearing briefing, the ALJ issued a 40-page Proposed Decision, dated August 6, 2009. In the Proposed Decision, the ALJ stated, among other things:

"Appellant [ReadyLink] has not met its burden of proof to show SCIF's 2005 payroll calculations were improper with regard to the inclusion of per diem monies. More specifically, Appellant failed to prove the per diem amounts paid to its employees were ‘reasonable’ and further failed to prove the nurses worked in locations that required them to incur additional expenses not normally assumed."

In reaching this conclusion, the ALJ specifically found that of the 259 nurses ReadyLink employed during the 2005 policy year, 142 of them lived within 50 miles of the hospitals to which they had been assigned, and as to the remaining 117, there was an absence of "any facts demonstrating [that] these 117 employees actually had a separate residence or that they incurred duplicate living expenses while in ReadyLink's employ as required by the plain language of the USRP." Thus, "all per diem payments made to [the 142 nurses who lived within 50 miles of their assignments] are properly considered payroll for premium calculation purposes" and "all per diem payments made to [the remaining 117 nurses for whom there was no demonstration of the incurring of duplicate living expenses] must be included in ReadyLink's payroll calculation for workers' compensation purposes."

The ALJ's Proposed Decision concluded with the following one-sentence order, "SCIF's decision regarding the 2005 policy year audit is affirmed."

The Insurance Commissioner adopted the ALJ's Proposed Decision and designated the decision as "precedential" by way of an order filed September 30, 2009.

5. ReadyLink's petition for writ of administrative mandamus in the Superior Court and its appeal of the trial court's denial of its petition

ReadyLink sought judicial review of the Insurance Commissioner's decision by petitioning the superior court for a peremptory writ of administrative mandamus under Code of Civil Procedure section 1094.5. In its petition, ReadyLink argued: "(1) the Commissioner exceeded his authority by effectively promulgating a ‘new’ regulation without proceeding through the required public hearing process; (2) the new rule was improperly applied retroactively to ReadyLink; and (3) the Commissioner failed to recognize that the IRS regulations [regarding per diem payments] are presumptively reasonable." ( ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1172, 148 Cal.Rptr.3d 881.)

The trial court issued a 10-page ruling denying ReadyLink's petition. ( ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1172, 148 Cal.Rptr.3d 881.) ReadyLink appealed the trial court's denial of the petition to the Second District Court of Appeal. ( Ibid. )

The appellate court affirmed the trial court's ruling denying ReadyLink's petition for a peremptory writ of administrative mandamus. ( ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1180, 148 Cal.Rptr.3d 881.) In reviewing the trial court's judgment, the appellate court concluded that (1) the trial court had applied the correct standard of review in considering ReadyLink's writ petition; (2) the Insurance Commissioner's decision was not preempted by federal tax law, as ReadyLink had argued for the first time on appeal; (3) the Insurance Commissioner's decision did not constitute a "new regulation" for which notice and a public hearing would be required because the Insurance Commissioner had merely "interpreted the USRP's subsistence payments rule to determine whether ReadyLink's per diem payments constituted payroll"; and (4) the equitable considerations that ReadyLink raised did not prevent the "retroactive" application of the Insurance Commissioner's decision to a prior policy year. ( Id. at pp. 1172–1179, 148 Cal.Rptr.3d 881.)

6. ReadyLink's separate federal action

While ReadyLink's appeal from the trial court's denial of its petition for a peremptory writ of administrative mandamus was pending, ReadyLink filed a putative class action lawsuit in federal district court against SCIF and the Insurance Commissioner. ReadyLink's "federal complaint alleged that IRS regulations preempted the [Insurance] Commissioner's decision, requested both declaratory and injunctive relief, and asserted various state-law damage claims." ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund (9th Cir. 2014) 754 F.3d 754, 757.)

The federal district court issued an order granting the defendants' motions to dismiss, concluding that with respect to ReadyLink's request for declaratory and injunctive relief based on federal preemption, the requirements for abstention were met under Younger v. Harris (1971) 401 U.S. 37, 91 S.Ct. 746, 27 L.Ed.2d 669 ( Younger ), and, further concluding that it was appropriate to decline to exercise supplemental jurisdiction over the remaining state-law claims. ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at p. 757.)

ReadyLink appealed the federal district court's judgment to the Ninth Circuit Court of Appeals. ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at p. 756.) While ReadyLink's federal appeal was pending, California's Second District Court of Appeal issued its opinion in ReadyLink Healthcare, supra , 210 Cal.App.4th 1166, 148 Cal.Rptr.3d 881, and the California Supreme Court denied review ( ibid. ), rendering the Second District's opinion final.

In providing background relevant to its determination of ReadyLink's appeal, the Ninth Circuit described what had occurred in ReadyLink's appeal of SCIF's decision to include the per diem amounts in the calculation of payroll to the Insurance Commissioner as follows:

"When SCIF audited ReadyLink for the 2005 policy year, it found that ReadyLink had failed to report certain per diem payments to employees as payroll, and billed ReadyLink for an additional premium of $555,327.53. ReadyLink appealed that decision to the California Department of Insurance, see Cal. Ins. Code § 11737(f), and an administrative law judge (ALJ) approved SCIF's premium calculation." (

ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at p. 757, italics omitted.)

In the sections of the opinion discussing whether the federal district court was correct in dismissing ReadyLink's complaint, the Ninth Circuit considered and decided two issues: (1) Had the district court properly abstained from adjudicating ReadyLink's federal preemption argument on Younger abstention grounds? and (2) Given the issuance of an opinion by the California Second District Court of Appeal's during the intervening time, in which the state appellate court rejected ReadyLink's federal preemption argument, did principles of issue preclusion bar ReadyLink's claim for declaratory relief? ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at pp. 757–760, 760–762.) The Ninth Circuit determined that the district court had erred in abstaining from adjudicating the federal preemption argument, but that ReadyLink was barred by the doctrine of issue preclusion from litigating its claim for declaratory relief. ( Ibid. ) B. Procedural background

1. SCIF's complaint and ReadyLink's answer

SCIF filed the action underlying this appeal in Riverside County Superior Court on January 13, 2015. SCIF alleged causes of action against ReadyLink for breach of contract, money due on an open book, and common count.

According to SCIF's complaint, ReadyLink entered into a written insurance contract with SCIF that was effective between September 1, 2005 and September 1, 2006. SCIF alleged that ReadyLink had breached the insurance contract by 1) failing to accurately report all of its payroll, in that it had improperly characterized some of its payroll as expense reimbursement; and 2) failing to pay SCIF the full premium when due under the policy, as established pursuant to SCIF's audit of the 2005 payroll records. SCIF sought damages in the amount of $555,327.53, plus prejudgment interest at the legal rate.

ReadyLink filed its answer to SCIF's complaint in March 2015. The answer included a general denial and asserted nine affirmative defenses: failure to state a cause of action, statute of limitations, waiver, estoppel, speculative damages, laches, ratification, unclean hands, and accord and satisfaction.

2. SCIF's Initial Motion for Judgment on the Pleadings

In August 2016, SCIF filed a motion for judgment on the pleadings. SCIF argued that ReadyLink's "boilerplate" affirmative defenses had not been properly stated because ReadyLink had failed to allege any facts to support them. SCIF further argued that these defenses were barred by principles of collateral estoppel and res judicata. SCIF requested that the trial court grant its motion for judgment on the pleadings, specifically with respect to ReadyLink's affirmative defenses, without leave to amend.

After a hearing on September 9, 2016, the trial court granted SCIF's motion for judgment on the pleadings. The trial court concluded that the affirmative defenses, as stated in the answer, "fail[ed] to state facts sufficient to constitute a defense." However, the court granted ReadyLink leave to amend its answer. The trial court concluded that "[t]he claim preclusion aspect of res judicata does not apply because issues raised in the underlying actions concerned the Insurance Commissioner's determination that per diem payments were properly considered payroll while the issue in this action is whether the failure to pay the $555,327.53 is a breach of the parties' contract." The court was unsure whether "the issue preclusion aspect of res judicata, otherwise referred to as collateral estoppel, may apply." However, because ReadyLink's answer failed to allege the facts necessary for the court to "analyze the effect of collateral estoppel," the court permitted ReadyLink to file an amended answer.

3. ReadyLink's first amended answer and subsequent proceedings

ReadyLink filed a first amended answer on September 14, 2016 in which it asserted six affirmative defenses—estoppel, ratification, fraud, unclean hands, waiver, and conflict with Insurance Code section 381. The first amended answer detailed the facts supporting these affirmative defenses, including allegations that at the time it first purchased insurance from SCIF, ReadyLink had informed SCIF "about its compensation structure and fully disclosed its per diem to SCIF" (italics omitted), that SCIF had conducted multiple audits in prior policy years in which it had said nothing about ReadyLink's per diem payment structure and had not included per diem payments as payroll, that SCIF had previously calculated ReadyLink's annual premiums with knowledge of ReadyLink's per diem payment structure, and that ReadyLink had relied on SCIF's representations about the amount of premium that ReadyLink would be charged in deciding to purchase workers' compensation insurance from SCIF.

Just after ReadyLink filed its original answer, it commenced discovery by serving Requests to Produce, Requests for Admission, Special Interrogatories, and Form Interrogatories on SCIF. Unhappy with what ReadyLink believed were "non-responsive" discovery responses from SCIF, and after meeting and conferring with SCIF's counsel, ReadyLink filed motions to compel further responses to its Requests to Produce, Form Interrogatories, and Special Interrogatories on November 8, 2016.

The trial court heard ReadyLink's motions to compel on March 15, 2017. The court denied all three motions on collateral estoppel grounds, stating, "It is clear from ReadyLink's Amended Answer that it seeks to relitigate the exact same issues already addressed before the Insurance Commission[er] and the Court of Appeal. Each of the assertions that ReadyLink makes in its Amended Answer were either expressly or implicitly addressed and rejected by the [C]ourt of [A]ppeal and cannot be relitigated in this action. The discovery sought by ReadyLink is to support their non-defensible affirmative defenses, which they are collaterally estopped from asserting in this action and therefore not relevant to this litigation. Accordingly, the court denies the motions in their entirety."

4. SCIF'S second motion for judgment on the pleadings

On August 3, 2017, SCIF filed a motion for judgment on the pleadings directed to ReadyLink's first amended answer. The motion asserted generally that the "Amended Answer does not state facts sufficient to constitute a defense to the complaint" and that "ReadyLink is collaterally estopped from asserting all of the affirmative defenses alleged." SCIF further claimed that "[t]he parties litigated on the merits all of the issues surrounding State Fund's attempts to enforce the terms of the insurance policy contract between State Fund and ReadyLink for the 2005 policy year four times- prior [to] the present collection action- resulting in three published decisions." (Italics omitted.)

As to each affirmative defense asserted in ReadyLink's first amended answer, SCIF relied on language from the appellate court's opinion in ReadyLink Healthcare, supra , 210 Cal.App.4th 1166, 148 Cal.Rptr.3d 881 to demonstrate that the issues underlying ReadyLink's affirmative defenses had been rejected by that court. For example, SCIF relied on the appellate court's statement that "[the fact t]hat a sole IRS auditor or prior SCIF auditors did not discover that ReadyLink's per diem payments could not be substantiated is not evidence that ReadyLink's practices were correct or that it reasonably believed them to be correct." ( Id. at p. 1179, 148 Cal.Rptr.3d 881.) According to SCIF, this statement by the appellate court demonstrated that "ReadyLink's reliance [on SCIF's prior audits] was not reasonable." SCIF also asserted that, "[a]s noted in ¶8 of the complaint, and repeatedly during this lawsuit, the parties litigated the issue of State Fund's damages in this matter at every possible level."

ReadyLink filed an opposition to SCIF's motion for judgment on the pleadings. In its opposition, ReadyLink contended that SCIF's pleadings failed to "sufficiently establish damages," by failing "to plead with particularity the contract terms giving rise to the amount owed." ReadyLink asserted that SCIF's reliance on the policy provision that states, " ‘All premiums for this policy will be determined by our manuals of rules, rates, rating plans and classifications’ " (boldface & italics omitted) was insufficient to establish damages because none of the "pertinent language of its manuals" was set forth in the complaint. ReadyLink also argued that it had never been provided the opportunity to litigate its affirmative defenses in any of the prior actions, and that in fact, it could not have litigated the issues raised by its affirmative defenses in the prior proceedings "because they were not relevant to the narrow issues decided in the prior proceedings." For example, ReadyLink noted that with respect to its affirmative defense of fraud, it had alleged that its decision to purchase insurance from SCIF was based on representations by SCIF that it would base its premium calculations on ReadyLink's accounting methods regarding its per diem program, which, ReadyLink further alleged, had been fully disclosed to SCIF prior to the inception of any of the policies SCIF issued to ReadyLink. ReadyLink also noted that "[t]here have been no express findings on the defenses ReadyLink raises in this case," and further argued that "[i]f these issues had been decided, SCIF would not have filed this action," suggesting that SCIF would not have had to file a breach of contract action if the issues raised in ReadyLink's affirmative defenses had in fact previously been litigated and determined. The trial court held a hearing on SCIF's second motion for judgment on the pleadings on September 22, 2017. During argument on the motion, the trial court asked ReadyLink's counsel, "Didn't the United States Court of Appeal[s] confirm an issue that was litigated and/or, to use your words, could have been litigated regarding the premium calculation? And the Court said, quote, ‘And an administrative law judge approved SCIF's premium calculation.’ That can only be fairly interpreted to mean that [what] the administrative law judge, at least so far as the U.S. Court of Appeal[s] for the Ninth Circuit [was concerned], determined[,] was a premium calculation and amount." ReadyLink's counsel attempted to explain that "it never was adjudicated in terms of the exact precise amount which was owed."

The trial court ultimately granted SCIF's second motion for judgment on the pleadings. In its written order, the court concluded that principles of issue preclusion prevented ReadyLink from relitigating the issue of the amount of premium that ReadyLink owed to SCIF for the 2005 policy year, stating, "This action was necessary to reduce SCIF's claim to the premium owed to a judgment. The amount owed is precisely what was determined in the underlying administrative decision and appeals." The court noted in its order that SCIF was seeking "to recover $555,327.53 in premiums for 2005." The court did not mention prejudgment interest.

5. Entry of judgment and ReadyLink's motion to vacate the judgment

SCIF's counsel served ReadyLink's counsel with a proposed judgment on October 11, 2017. SCIF had failed to provide ReadyLink with the required 10 days to make objections, as required by California Rules of Court, rule 3.1590(j), submitting its proposed judgment to the court just five days after the trial court issued its ruling. ReadyLink filed an objection to the proposed judgment on October 19, 2017; however, the trial court had already signed the proposed judgment on October 16.

The judgment signed by the court included interest on the judgment at the rate of 10 percent per annum dating from July 30, 2007. However, the issue of SCIF's entitlement to prejudgment interest had not been addressed prior to that point in time. On October 24, 2017, ReadyLink filed a motion to vacate the judgment, arguing that the judgment impermissibly included prejudgment interest, which was not available under Civil Code section 3287, given that the parties had required the assistance of the court in fixing SCIF's damages.

SCIF argued in opposition to ReadyLink's motion to vacate the judgment that the premium amount owed by ReadyLink was "established to a legal certainty" as a result of the single sentence in the Ninth Circuit Court of Appeals' opinion describing the prior history of the related administrative action before the Insurance Commissioner and reviewed by California state trial and appellate courts. SCIF further argued that the amount of damages became fixed when ReadyLink withdrew its affirmative defense of "speculative damages."

In denying ReadyLink's motion to vacate the judgment, the trial court rejected ReadyLink's objections to the judgment, stating that the "objections are not well founded."

The trial court entered judgment on October 16, 2017. The judgment awarded SCIF $555,327.53 "for the 2005 premium bill issued by Plaintiff on June 29, 2007" and awarded another $571,606.99 in prejudgment interest for the time period between July 30, 2007 and October 11, 2017. SCIF filed notice of entry of judgment on ReadyLink on November 30, 2017. ReadyLink filed a timely notice of appeal from the judgment.

III.

DISCUSSION

A. Three requests for judicial notice

While this appeal was pending, the parties filed three requests for judicial notice with this court. As an initial matter, we address these requests for judicial notice.

1. ReadyLink's request for judicial notice filed June 15, 2018

On June 15, 2018, ReadyLink filed a request that this court take judicial notice of "the State Compensation Insurance Fund ‘Workers' Compensation Insurance — Rate Filing Form’ with the Department of Insurance for the year 2005, filed June 1, 2005." SCIF did not oppose ReadyLink's request for judicial notice of this document.

Although no opposition was filed to ReadyLink's request for judicial notice of certain portions of SCIF's 2005 rate filing, we deny the request on the ground that the materials are not relevant to our determination of the issues on appeal. (See Mangini v. R. J. Reynolds Tobacco Co. (1994) 7 Cal.4th 1057, 1063, 31 Cal.Rptr.2d 358, 875 P.2d 73 ( Mangini ) [only relevant material is subject to judicial notice], overruled on other grounds by In re Tobacco Cases II (2007) 41 Cal.4th 1257, 63 Cal.Rptr.3d 418, 163 P.3d 106.)

2. SCIF's request for judicial notice filed October 16, 2018 and its related request for judicial notice filed November 21, 2018

On October 16, 2018, SCIF filed a request for judicial notice and sought judicial notice of the following documents and records:

"1. Exhibit A-Transcript of Hearing, Riverside County Superior Court Case No. PSC 1500168 State Compensation Insurance Fund v. ReadyLink Healthcare, Inc., Reporter's Transcript of Motion for Judgment on the Pleadings, Before the Honorable David M. Chapman September 22, 2017.

"2. Exhibit B-Supplemental Brief in Support of Petitioner ReadyLink Healthcare, Inc.'s Petition for Writ of Administrative Mandamus, submitted to the Los Angeles Superior Court, in case No. BS 124590, ReadyLink Healthcare, Inc. v. Steve Poizner, et al. served on January 31, 2011 to be heard April 14, 2011.

"3. Exhibit C-State Compensation Insurance Fund's Discovery Request, filed with the Insurance Commissioner of the State of California on September 12, 2008, In the Matter of the Appeal of ReadyLink Healthcare, Inc. , Case No. AHB-WCA-08-14, and Appellant's Objections to SCIF's Discovery Request.

"4. Exhibit D-The California Department of Insurance Commissioner's Precedential Decision In the Matter of the Appeal of Advanced Fuel Filtration Systems [ ] (5/21/04) AHB-WCA-03-45.

"5. Exhibit E-The California Department of Insurance Commissioner's Precedential Decision In the Matter of the Appeal of E M Machining (11/29/01) File No. ALB –WCA-00-30.

"6. Exhibit F-Excerpt from Rassp & Herlick, California Workers' Compensation Law § 3.11 Insurance Premiums. [8] Employer-Insurer Disputes.

"7. Exhibit G-Excerpt from Levine on California Workers' Compensation Premium and Insurance , Copyright 2006, by International Risk Management Institute, Inc., p. 6.D.3."

On November 21, 2018, SCIF filed a second request for judicial notice that it identified as an "abridged request [for judicial notice filed] concurrently with its brief." (Italics added.) In the document, SCIF requested that this court take judicial notice of the same documents for which it had sought judicial notice in its previous request for judicial notice, with the exception of the first document, the "Transcript of Hearing, Riverside County Superior Court Case No. PSC 1500168." ReadyLink filed oppositions to both requests for judicial notice.

We grant SCIF's request for judicial notice of the following two documents, pursuant to Evidence Code section 452, subdivision (c), which permits a court to take judicial notice of the "[o]fficial acts of the legislative, executive, and judicial departments of the United States and of any state of the United States":

(1) "The California Department of Insurance Commissioner's Precedential Decision In the Matter of the Appeal of Advanced Fuel Filtration Systems [ ] (5/21/04) AHB-WCA-03-45."

(2) "The California Department of Insurance Commissioner's Precedential Decision In the Matter of the Appeal of E M Machining (11/29/01) File No. ALB –WCA-00-30."

We deny SCIF's request for judicial notice of the remaining materials on the ground that they are not relevant to our determination of the issues on appeal (see Mangini, supra , 7 Cal.4th at p. 1063, 31 Cal.Rptr.2d 358, 875 P.2d 73 ).

B. The trial court erred in granting SCIF's motion for judgment on the pleadings

ReadyLink challenges the trial court's decision to grant SCIF's motion for judgment on the pleadings, based on the court's stated conclusion that "[r]es judicata bars relitigation of the determination of the premium owed" (boldface & underscoring omitted). According to ReadyLink, the issues in this case are not "identical to" the issues in the prior administrative proceeding. ReadyLink contends that "while the ALJ ruled on how ReadyLink's per diem payments would be classified for workers' compensation premium purposes, no decision has ever touched on the amount of premium to which SCIF would be entitled" (second italics added). ReadyLink further contends that "[t]he prior litigation between the parties did not actually or necessarily decide SCIF's entitlement to damages" (bolding & some capitalization omitted). ReadyLink notes that most of the factual issues that must be determined with respect to SCIF's breach of contract claim against ReadyLink are issues that are distinct from the issues that were considered and decided in the administrative proceeding, the writ of administrative mandamus proceeding and appeal, and the separate federal proceeding, and include issues such as: (1) "Did SCIF fully perform under the contract of insurance"; (2) "Did ReadyLink breach by failing to pay premiums when due"; (3) "Did SCIF suffer damages as a result of any breach"; (4) "If [SCIF did suffer damages], what [is the] amount of those damages " (italics added); and "Do any affirmative defenses apply to eliminate or reduce ReadyLink's liability."

In response, SCIF asserts that the "audit clearly established the amount of premium owed" (boldface & some capitalization omitted) by ReadyLink. SCIF further contends that ReadyLink "argued exhaustive facts and contentions regarding all of its affirmative defenses in the prior litigation," such that it either previously litigated all of the issues relevant to its affirmative defenses or was required to have raised the issues with the Insurance Commissioner and failed to do so, thereby barring it from relitigating these issues in this action.

To determine whether, as the trial court concluded, principles of issue preclusion bar ReadyLink from litigating issues raised by SCIF's claims or the six affirmative defenses that ReadyLink raised in its first amended answer, we must examine the doctrines of res judicata and collateral estoppel, and the relationship of those principles to the administrative hearing and the subsequent judicial review of that administrative hearing, as well as the separate federal action. We then apply the preclusion doctrines to determine whether the trial court was correct in concluding that the "amount owed" by ReadyLink under the parties' contract was "determined in the underlying administrative decision and appeals."

1. Relevant legal standards on review from judgment on the pleadings

A plaintiff is entitled to judgment on the pleadings if its complaint states a cause of action against the defendant and the defendant's answer does not state facts sufficient to constitute a defense. ( Code Civ. Proc., § 438, subd. (c)(1)(A), (3)(A).) " ‘A motion for judgment on the pleadings, like a general demurrer, tests the allegations of the [pleadings at issue], supplemented by any matter of which the trial court takes judicial notice, to determine whether [the party] has stated a cause of action. [Citation.] Because the trial court's determination is made as a matter of law, we review the ruling de novo , assuming the truth of all material facts properly pled.’ " ( Angelucci v. Century Supper Club (2007) 41 Cal.4th 160, 166, 59 Cal.Rptr.3d 142, 158 P.3d 718 ( Angelucci ).)

2. Preclusion doctrines

"As generally understood, ‘[t]he doctrine of res judicata gives certain conclusive effect to a former judgment in subsequent litigation involving the same controversy.’ " ( People v. Barragan (2004) 32 Cal.4th 236, 252, 9 Cal.Rptr.3d 76, 83 P.3d 480 ( Barragan ), italics omitted.) " ‘In its primary aspect,’ commonly known as claim preclusion, [res judicata] ‘operates as a bar to the maintenance of a second suit between the same parties on the same cause of action. [Citation.]’ [Citation.] ‘In its secondary aspect,’ commonly known as collateral estoppel, ‘[t]he prior judgment ... "operates" ‘ in ‘a second suit ... based on a different cause of action ... "as an estoppel or conclusive adjudication as to such issues in the second action as were actually litigated and determined in the first action." ’ " ( Id. at pp. 252–253, 9 Cal.Rptr.3d 76, 83 P.3d 480.)

" ‘The doctrine of res judicata, whether applied as a total bar to further litigation or as collateral estoppel, "rests upon the sound policy of limiting litigation by preventing a party who has had one fair adversary hearing on an issue from again drawing it into controversy and subjecting the other party to further expense in its reexamination." ’ [Citations.]" ( Bucur v. Ahmad (2016) 244 Cal.App.4th 175, 185, 198 Cal.Rptr.3d 127.) Res judicata promotes judicial economy by precluding parties from engaging in the type of piecemeal litigation that may occur if a single cause of action is split into more than one lawsuit or if a particular issue has already been decided in an earlier lawsuit. ( Mycogen Corp. v. Monsanto Co. (2002) 28 Cal.4th 888, 897, 123 Cal.Rptr.2d 432, 51 P.3d 297 ( Mycogen ).)

Although the res judicata doctrine encompasses both claim and issue preclusion, the term "res judicata" has sometimes been used by California courts to denote claim preclusion, while the term "collateral estoppel" has been used to refer to issue preclusion. (See Mycogen, supra , 28 Cal.4th at p. 896, fn. 7, 123 Cal.Rptr.2d 432, 51 P.3d 297.) Given that "res judicata" has sometimes been used to refer to claim preclusion and at other times has been used in a broader sense to refer to both claim and issue preclusion, or even issue preclusion, only, (see DKN Holdings LLC v. Faerber (2015) 61 Cal.4th 813, 824, 189 Cal.Rptr.3d 809, 352 P.3d 378 ( DKN Holdings )), we will adopt the labels employed by the Supreme Court in DKN Holdings and will "use the terms ‘claim preclusion’ to describe the primary aspect of the res judicata doctrine and ‘issue preclusion’ to encompass the notion of collateral estoppel." ( Ibid. )

" ‘The prerequisite elements for applying the doctrine [of preclusion] to either an entire cause of action or one or more issues are the same: (1) A claim or issue raised in the present action is identical to a claim or issue litigated in a prior proceeding; (2) the prior proceeding resulted in a final judgment on the merits; and (3) the party against whom the doctrine is being asserted was a party or in privity with a party to the prior proceeding.’ " ( Barragan, supra , 32 Cal.4th at p. 253, 9 Cal.Rptr.3d 76, 83 P.3d 480.) However, there are some differences.

"Claim preclusion ‘prevents relitigation of the same cause of action in a second suit between the same parties or parties in privity with them.’ [Citation.] Claim preclusion arises if a second suit involves (1) the same cause of action (2) between the same parties (3) after a final judgment on the merits in the first suit. [Citations.] If claim preclusion is established, it operates to bar relitigation of the claim altogether." ( DKN Holdings, supra , 61 Cal.4th at p. 824, 189 Cal.Rptr.3d 809, 352 P.3d 378.) California courts apply the "primary rights" theory in assessing whether two proceedings involve identical causes of action. (See Mycogen, supra , 28 Cal.4th at p. 904, 123 Cal.Rptr.2d 432, 51 P.3d 297.) "The plaintiff's primary right is the right to be free from a particular injury, regardless of the legal theory on which liability for the injury is based. [Citation.] The scope of the primary right therefore depends on how the injury is defined. A cause of action comprises the plaintiff's primary right, the defendant's corresponding primary duty, and the defendant's wrongful act in breach of that duty." ( Federation of Hillside & Canyon Assns. v. City of Los Angeles (2004) 126 Cal.App.4th 1180, 1202, 24 Cal.Rptr.3d 543.) Additionally, " ‘[i]f the matter was within the scope of the action, related to the subject-matter and relevant to the issues, so that it could have been raised, the judgment is conclusive on it despite the fact that it was not in fact expressly pleaded or otherwise urged .... A party cannot by negligence or design withhold issues and litigate them in consecutive actions. Hence the rule is that the prior judgment [constitutes claim preclusion] on matters which were raised or could have been raised, on matters litigated or litigable.’ " ( Aerojet-General Corp. v. American Excess Ins. Co. (2002) 97 Cal.App.4th 387, 402, 117 Cal.Rptr.2d 427, italics omitted.)

"Issue preclusion prohibits the relitigation of issues argued and decided in a previous case, even if the second suit raises different causes of action. [Citation.]" ( DKN Holdings, supra , 61 Cal.4th at p. 824, 189 Cal.Rptr.3d 809, 352 P.3d 378.) "[I]ssue preclusion applies (1) after final adjudication (2) of an identical issue (3) actually litigated and necessarily decided in the first suit^{[ ]} and (4) asserted against one who was a party in the first suit or one in privity with that party. [Citations.]" ( DKN Holdings, supra , at p. 825, 189 Cal.Rptr.3d 809, 352 P.3d 378.) If all four of the requirements for issue preclusion are satisfied, a court then also determines whether application of preclusion would be consistent with the "preservation of the integrity of the judicial system, promotion of judicial economy, and protection of litigants from harassment by vexatious litigation." ( Lucido v. Superior Court (1990) 51 Cal.3d 335, 272 Cal.Rptr. 767, 795 P.2d 1223.)

The "party who asserts claim or issue preclusion as a bar to further litigation bears the burden of proving that the requirements of the doctrine are satisfied." ( Hong Sang Market, Inc. v. Peng (2018) 20 Cal.App.5th 474, 489, 229 Cal.Rptr.3d 99 ( Hong Sang ).)

3. Analysis

Although SCIF's briefing is somewhat confusing on this point, SCIF appears to contend that the administrative proceeding conclusively determined the amount that ReadyLink owes to SCIF under the contract (as the trial court apparently concluded when it stated that "[t]he amount owed is precisely what was determined in the underlying administrative decision"), or, in the alternative, that to the extent that the ALJ did not decide the amount of premium due, the ALJ's failure to do so resulted from ReadyLink's failure to pursue or exhaust its administrative remedies. We disagree with both contentions. a. The issues raised by the complaint and ReadyLink's first amended answer are not identical to the issues determined in those prior proceedings

SCIF maintains that ReadyLink "argued exhaustive facts and contentions regarding all of its affirmative defenses in the prior litigation." However, SCIF does not identify which "facts" or "contentions" it believes ReadyLink previously argued that would bar its affirmative defenses and entitle SCIF to a judgment on its breach of contract claim in this action, and also fails to identify where in the administrative record, or in the record of any prior court proceeding, those facts or contentions were actually raised.

SCIF's complaint in this case includes a claim for breach of contract, a common count for reasonable value, and a claim for "open book." The elements of a claim for breach of contract are: (1) the existence of a contract; (2) the plaintiff's performance or excuse for nonperformance of the contract; (3) defendant's breach; and (4) damage to plaintiff resulting from the breach. ( Oasis West Realty, LLC v. Goldman (2011) 51 Cal. 4th 811, 821, 124 Cal.Rptr.3d 256, 250 P.3d 1115.) A common count for reasonable value has the following elements: (1) plaintiff performed certain services for the defendant; (2) the reasonable value of those services; (3) the services were rendered at the request of the defendant; and (4) the services were unpaid. ( Haggerty v. Warner (1953) 115 Cal.App.2d 468, 475, 252 P.2d 373.) The elements of an open book account cause of action are: "1. That [plaintiff] and [defendant] had financial transactions ... ; [¶] 2. That [plaintiff] ... kept [an] account of the debits and credits involved in the transactions; [¶] 3. That [defendant] owes [plaintiff] money on the account; and [¶] 4. The amount of money that [defendant] owes [plaintiff]." ( CACI No. 372.) For every cause of action that SCIF has asserted, SCIF must establish the amount of money due (in the form of damages, reasonable value of services, or money due on an open book account).

ReadyLink's affirmative defenses to SCIF's complaint include estoppel, ratification, fraud, unclean hands, waiver, and violation of Insurance Code section 381. All of these affirmative defenses are based on ReadyLink's general factual allegations, which include the following assertions: that ReadyLink "was upfront with SCIF about its compensation structure and fully disclosed its per diem to SCIF" (italics omitted) when it purchased insurance from SCIF; that "[a]fter reviewing ReadyLink's [per diem reliant] compensation structure, and with full knowledge of that structure, SCIF represented to ReadyLink what ReadyLink's premiums would be based upon ReadyLink's [per diem reliant] compensation method"; that "[i]n deciding to purchase insurance from SCIF, ReadyLink reasonably relied upon SCIF's representation that it had fully reviewed ReadyLink's compensation formulas and that the premium SCIF was offering ... was the premium SCIF would charge"; that "SCIF repeatedly audited ReadyLink for the 2000 through 2004 calendar years and did not say a peep to ReadyLink about whether ReadyLink's [per diem reliant] compensation formulas could lead to an additional premium down the road"; that "ReadyLink believed, and had every reason to believe, that SCIF had looked at ReadyLink's payroll practices and properly charge[d] premiums based on those practices"; that "SCIF paid [workers' compensation] claims [out] to nurses using the very salary schedules ReadyLink used[, which excluded per diem payments as wages]"; and that if "ReadyLink [had] known the truth about SCIF's intentions [to later contend ReadyLink did not properly classify all of its payroll as payroll], it would not have done business with SCIF."

A review of the record, including the ALJ's Proposed Decision as adopted by the Insurance Commissioner, clearly demonstrates that none of these factual allegations, nor the legal impact of such allegations with respect to SCIF's breach of contract/collection action, was at issue in the administrative proceeding, much less decided by the ALJ. Further, although the trial court concluded that SCIF was entitled to judgment on the pleadings because, as the trial court stated, "[t]he amount owed is precisely what was determined in the underlying administrative decision and appeals," in fact, the ALJ's Proposed Decision demonstrates that the ALJ did not consider or determine the amount of premium that ReadyLink owes SCIF under the 2005 policy contract.

The single issue before the ALJ was whether SCIF's inclusion as payroll those amounts that ReadyLink paid to its employee nurses as per diems for the 2005 policy year complied with the USRP. Indeed, in a letter sent from the WCIRB to the ALJ assigned to decide ReadyLink's appeal, the WCIRB asserts that "[t]he matter under appeal is whether the monies that ReadyLink paid to its employees as ‘subsistence payments’ should be included as payroll." The letter further states: "The WCIRB has no first hand knowledge of the manner in which ReadyLink either compensates its employees or reimburses them for travel expenses. That said, pursuant to the above referenced section of Appendix III [of USRP, the Payroll Remuneration Table], should it be determined that the payments ... should be excluded from payroll. [¶] If it is determined that the payments in question cannot reasonably be considered to be payments to cover an employee's additional expenses incurred based upon a job's location, then all or a portion of the monies should be included as payroll." The ALJ defined the issue to be decided as whether SCIF had properly interpreted and applied the Insurance Commissioner's regulations for determining payroll to include ReadyLink's per diem payments to its employees; the ALJ did not define the issue to be decided as whether the premium amount that SCIF had calculated as being due by ReadyLink was accurate. The ALJ introduced the matter by stating that the appeal was about a dispute "regarding the proper calculation of payroll for premium and statistical reporting purposes under the terms of the California Workers' Compensation Uniform Statistical Reporting Plan. " (Italics added.) The ALJ identified the "Statement of Issues" as including a single issue: "1. For policy year 2005, did SCIF properly include per diem payments made to registry nurses as ‘payroll’ or ‘remuneration’ pursuant to USRP, Part 3, Section V?"

In determining this issue, the ALJ considered evidence regarding ReadyLink's per diem program, as well as evidence of the per diem programs of other nurse staffing companies and evidence provided by SCIF regarding its audit procedure. In her decision, the ALJ provided background regarding the relevant regulatory framework, including information regarding the WCIRB's function—i.e., "to collect accurate payroll and loss information regarding every California workers' compensation insurance policy." The ALJ noted that "[g]iven the critical nature of accurate data, every insurer must record and report its policy payroll and claims loss data to the WCIRB pursuant to the rules in the USRP. " (Italics added.) Thus, as the ALJ viewed it, her task was to determine whether SCIF, as a workers' compensation insurer, was accurately reporting to the WCIRB the payroll amounts under its issued policies pursuant to the regulations governing how payroll is to be determined.

As the ALJ noted, the USRP excludes from payroll "[s]ubsistence payments" that "are considered to be reimbursements for the additional living expense[s] by virtue of job location," and further allows that such excluded "[s]ubsistence payments" may be "stipulated per diem amounts" if " ‘the amount is reasonable and the employer's records show that the employee worked at a job location that would have required the employee to incur additional expenses not normally assumed by the employee.’ " The ALJ explained that the USRP did not define " ‘reasonable,’ " nor did it provide guidelines as to what might constitute " ‘additional expenses not normally assumed by the employee.’ " Thus, the ALJ set out to interpret the word " ‘reasonable’ " in the USRP's reference to stipulated per diem amounts, and also to interpret the meaning of the USRP's reference to records demonstrating that the employee was " ‘working at a location that would have required an employee to incur additional expenses not normally assumed.’ " After providing interpretations of those portions of the USRP, the ALJ proceeded to apply those standards to the facts presented regarding ReadyLink's per diem payment program. The ALJ concluded that ReadyLink's stipulated per diem amount was not "reasonable" under the USRP, and that ReadyLink had failed to demonstrate that its nurses who received the per diem payments had been working in a location where they would have incurred additional living expenses that they would not have otherwise normally assumed. As a result, the ALJ concluded that ReadyLink had not met its burden to demonstrate that SCIF had improperly included the per diem amounts paid to ReadyLink's nurse employees in calculating ReadyLink's 2005 policy year premium, and further concluded that it was therefore appropriate to affirm "SCIF's decision regarding the 2005 policy year audit."

It is clear from the entirety of the ALJ's written decision that the ALJ's seemingly broad statement—i.e., that "SCIF's decision regarding the 2005 policy year audit" was affirmed—would be more accurately stated as "SCIF's decision [to include as payroll those amounts that ReadyLink paid to its nurses as stipulated per diem payments] regarding the 2005 policy year audit" was affirmed. This is because, as noted, the sole issue that the ALJ determined in her Proposed Decision (and thus the sole issue determined by the Insurance Commissioner) was whether SCIF had correctly interpreted and applied the USRP standards regarding the inclusion of ReadyLink's per diem payment as payroll for use in calculating ReadyLink's premium. Further, a review of the subsequent proceedings initiated by ReadyLink to challenge the Insurance Commissioner's decision to adopt the ALJ's Proposed Decision also demonstrates that the parties were not litigating either the amount of premium owed or the broad range of issues that arise from the complaint in this collection action and the affirmative defenses to the collection action asserted in the first amended answer. In its ruling on ReadyLink's petition for a writ of administrative mandamus, the trial court summarized the "dispute between [SCIF] and ReadyLink" as a dispute "regarding the proper determination of Petitioner's total nurse payroll paid out during its 2005 policy period," which the court thereafter described as a question involving the interpretation of the USRP. Absent from this description is any suggestion that the dispute involved other questions, such as the total amount of the premium owed by ReadyLink, or whether SCIF's past conduct in relation to ReadyLink might provide a legal basis for ReadyLink to avoid having to pay the premium for the 2005 policy year as determined by SCIF.

However, the trial court's ruling does demonstrate that certain other issues related to the propriety of including per diem payments in payroll were also "actually litigated" and "decided" ( DKN Holdings, supra , 61 Cal.4th at p. 825, 189 Cal.Rptr.3d 809, 352 P.3d 378 ) in the writ proceeding. Specifically, ReadyLink argued in favor of the issuance of a writ of administrative mandamus on four grounds, all addressed by the trial court in that proceeding: (1) that the Insurance Commissioner's application of the USRP to ReadyLink's per diem payment structure constituted a "[n]ew [r]egulation," and that the Insurance Commissioner had no authority to issue a new regulation; (2) that the Insurance Commissioner's interpretation of the USRP and his application of that interpretation to the facts of ReadyLink's per diem payment structure was impermissibly retroactive; (3) that the Insurance Commissioner was bound by the results of an IRS tax audit and/or was required to adopt IRS standards or rules in order to interpret the USRP's rules regarding payroll; and (4) that the Insurance Commissioner improperly exceeded his authority by addressing a "rate controversy" regarding the rates in State Fund rate filing. The trial court rejected all of ReadyLink's contentions and denied its petition for a writ of administrative mandamus. None of these issues involves a determination as to the final amount of premium that ReadyLink owes (after a determination of all of the relevant inputs and the appropriate application of relevant calculations), or whether ReadyLink has any defenses to SCIF's collection action based on SCIF's conduct prior to the 2005 policy year.

The trial court's determination of these issues became final upon the affirmance of its judgment by the appellate court in ReadyLink Healthcare, supra , 210 Cal.App.4th at p. 1172, 148 Cal.Rptr.3d 881, with review denied in the Supreme Court on February 13, 2013, and once the time for filing a petition for writ of certiorari to the United States Supreme Court passed. (See People v. Buycks (2018) 5 Cal.5th 857, 876, 236 Cal.Rptr.3d 84, 422 P.3d 531 ["A judgment becomes final when the availability of an appeal and the time for filing a petition for certiorari with the United States Supreme Court have expired. [Citation.]"].)

A review of ReadyLink Healthcare, supra , 210 Cal.App.4th 1166, 148 Cal.Rptr.3d 881, further demonstrates that the issues that remain to be decided in this collection action were not previously considered, let alone decided, in the appellate review from the writ proceeding. The appellate court in ReadyLink Healthcare addressed ReadyLink's four claims of error: (1) whether the trial court applied the correct standard of review in assessing ReadyLink's petition for a writ of administrative mandamus ( id. at p. 1172, 148 Cal.Rptr.3d 881 ); (2) whether the Insurance Commissioner's decision was preempted by federal law ( id. at p. 1173, 148 Cal.Rptr.3d 881 ); (3) whether the Insurance Commissioner's decision constituted a "new regulation" that required a public hearing and opportunity to comment under Insurance Code section 11750, subdivision (b) ( ReadyLink Healthcare , supra , at pp. 1177–1178, 148 Cal.Rptr.3d 881 ); and (4) whether equitable considerations, including arguments that the Insurance Commissioner's decision constituted a new regulation, that "ReadyLink's recordkeeping practices were based on the advice of payroll and legal experts and passed muster with the IRS," and that "SCIF's prior audits had excluded the same per diem payments from ReadyLink's payroll," required that the administrative decision not be applied to include the per diem payments as payroll for purposes of determining ReadyLink's premium for the 2005 policy year ( id. at p. 1179, 148 Cal.Rptr.3d 881 ). None of these issues involves the question of the "amount" of premium "owed." Nor do these issues address the factual questions raised by ReadyLink's first amended answer, such as whether SCIF knew about ReadyLink's per diem payment structure before ReadyLink purchased insurance through SCIF, whether SCIF affirmatively represented to ReadyLink that its premiums would be calculated based on that per diem payment structure, or whether ReadyLink reasonably relied on such representations, if they occurred, in purchasing insurance through SCIF. Neither the Insurance Commissioner, the trial court nor the appellate court addressed whether, if the facts alleged by ReadyLink are true, they amount to fraud or waiver such that SCIF should be precluded from collecting a premium based on calculations that include the per diem payments as payroll. Further, none of ReadyLink's affirmative defenses to SCIF's collection action were relevant to the issues addressed by the Insurance Commissioner, the trial court or the appellate court, nor were they considered or decided in the collateral federal proceedings initiated by ReadyLink to challenge the Insurance Commissioner's adoption of the ALJ's decision. As we have already described, ReadyLink's putative class action lawsuit filed against SCIF and the Insurance Commissioner in the federal district court alleged that IRS regulations pertaining to per diem payments preempted the Insurance Commissioner's decision regarding the treatment of ReadyLink's per diem payments for purposes of calculating payroll for workers' compensation insurance under the USRP. (See ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at p. 757.) The federal district court decided two issues in dismissing the case: (1) that the Younger requirements for abstention were met with respect to ReadyLink's request for declaratory and injunctive relief on federal preemption grounds, and (2) that it would decline to exercise supplemental jurisdiction over any remaining state-law claims. ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , at p. 757.) Thus, the federal district court decided issues related solely to the propriety of a federal court deciding any of the issues raised in the complaint on their merits. Upon ReadyLink's appeal, the Ninth Circuit Court of Appeals also considered only two issues, albeit one issue considered by the trial court, and a second issue not considered by the trial court: (1) whether the Younger abstention doctrine provided grounds for the trial court to decline to adjudicate ReadyLink's claim for declaratory and injunctive relief based on federal preemption, and (2) whether principles of issue preclusion arising from the state appellate court's rejection of the federal preemption argument barred ReadyLink from relitigating the federal preemption argument. ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund , at pp. 757–760, 760–762.) It is readily apparent that none of the issues addressed in the federal action, either at the district court or appellate court level, concerns the amount of premium owed by ReadyLink.

The trial and appellate courts in the federal action did not consider, much less decide, the question of the amount of premium actually owed by ReadyLink for workers compensation insurance for the 2005 policy year. However, in considering the issues raised on SCIF's motion for judgment on the pleadings, the trial court appears to have given undue weight to a single sentence in the Ninth Circuit Court of Appeals' opinion. Specifically, in a section providing background context regarding the collateral administrative and court proceedings that ReadyLink had initiated in California forums, the Ninth Circuit described what it understood to have taken place in the administrative proceeding, summarizing that proceeding as follows:

"When SCIF audited ReadyLink for the 2005 policy year, it found that ReadyLink had failed to report certain per diem payments to employees as payroll, and billed ReadyLink for an additional premium of $555,327.53. ReadyLink appealed that decision to the California Department of Insurance, see Cal. Ins. Code § 11737(f), and an administrative law judge (ALJ) approved SCIF's premium

calculation." ( ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund, supra , 754 F.3d at p. 757.)

The trial court in this case seized on the Ninth Circuit's description of what the Ninth Circuit understood the ALJ to have done (i.e., "an administrative law judge (ALJ) approved SCIF's premium calculation") and appears to have concluded that the Ninth Circuit's descriptive statement regarding what it believed had occurred in the administrative proceeding should itself be given preclusive effect. In other words, the trial court appears to have concluded that the Ninth Circuit's statement that "an administrative law judge (ALJ) approved SCIF's premium calculation" was a determination, on the merits that the ALJ had determined, on the merits, that ReadyLink owed SCIF the additional premium amount that SCIF had charged ReadyLink. The trial court thus relied on two levels of issue preclusion to bar ReadyLink from litigating its affirmative defenses to SCIF's contract action. However, the question of what issues had been considered and decided by the ALJ, or what other issues could have been raised but were not, in the administrative proceeding was not before the Ninth Circuit; rather, the Ninth Circuit was merely attempting to summarize what had occurred in prior litigation between the parties. A loose description of the history of a collateral proceeding cannot form the basis of a preclusive determination of an issue on its merits. (See Hernandez, supra , 46 Cal.4th at p. 511, 94 Cal.Rptr.3d 1, 207 P.3d 506 ["For purposes of [issue preclusion], an issue was actually litigated in a prior proceeding if it was properly raised, submitted for determination, and determined in that proceeding " (italics added) ].) Here, the issue of the dollar amount of the premium was not decided by the ALJ; the Ninth Circuit's statement in ReadyLink Healthcare, Inc. v. State Compensation Ins. Fund regarding what it believed the ALJ had decided was provided merely as background.

Our review of the collateral proceedings between ReadyLink and SCIF makes clear that the trial court erred in concluding that the issues raised by SCIF's collection action and by ReadyLink's affirmative defenses to that action had been litigated and decided in a prior action.

b. Contrary to SCIF's assertions, ReadyLink could not have raised as "claims" in the prior administrative proceeding those matters that form its affirmative defenses in this action

The trial court granted SCIF's motion for judgment on the pleadings based on the erroneous conclusion that "[t]he amount [of premium] owed [by ReadyLink] is precisely what was determined in the underlying administrative decision and appeals." SCIF contends that if these issues were not in fact previously determined in the underlying administrative proceeding, it is because "ReadyLink disregarded its opportunity to dispute the premium owed before the Insurance Commissioner" (boldface & some capitalization omitted). SCIF thus suggests that ReadyLink should be barred from litigating its affirmative defenses in response to SCIF's breach of contract action against it on the basis that ReadyLink could have, and should have, litigated before the ALJ the issue of the amount of premium due. SCIF asserts that ReadyLink "was required to exhaust its administrative remedies, which included the opportunity to dispute the premium owed, before the Department of Insurance, when it brought its initial appeal," but ReadyLink "affirmatively chose not to do so."

SCIF is incorrect in suggesting that ReadyLink should be barred from litigating the amount of premium due (apart from that aspect of the premium that involves including the per diem payments as payroll for premium calculation purposes, which has been litigated and decided), or whether SCIF is not entitled to full payment of the premium claimed, as alleged in ReadyLink's affirmative defenses. SCIF appears to be suggesting that the prior administrative action has preclusive effect as to all other issues raised by ReadyLink in this case because, SCIF maintains, ReadyLink was required to exhaust its administrative remedies by raising the other issues in the administrative proceeding before the Insurance Commissioner, and its failure to do so precludes it from raising these issues now. Although causes of action or defenses that could have been brought in an earlier action may be barred because they are subject to claim preclusion, "a prior judgment generally does not bar a subsequent claim if the matter could not have been raised or litigated in the earlier action." ( Hong Sang, supra , 20 Cal.App.5th at p. 491, 229 Cal.Rptr.3d 99, italics omitted.) Despite SCIF's suggestions to the contrary, SCIF has presented no authority to demonstrate that ReadyLink could have actually litigated the issues bearing on whether SCIF calculated the correct premium amount, or issues regarding its affirmative defenses in the administrative proceeding.

"Administrative agencies have only such powers as have been conferred on them, expressly or by implication, by Constitution or statute." ( Noble v. Draper (2008) 160 Cal.App.4th 1, 12, 73 Cal.Rptr.3d 3.) The record in this case reveals Insurance Code sections 11753.1 and 11737, subdivision (f) as possible statutory bases for ReadyLink's appeal to the Insurance Commissioner of SCIF's audit decision to include the per diem payments as payroll. Both of these statutory provisions make clear that only the matters identified in those statutory provisions may be appealed to, and determined by, the Insurance Commissioner. Neither of these provisions indicates that the Insurance Commissioner has the authority to consider the common law breach of contract and other collection claims raised by SCIF in this action, or to consider the equitable and other affirmative defenses to SCIF's claims asserted by ReadyLink. We have been directed to no authority that would suggest that the Insurance Commissioner has any authority to consider other aspects of a premium calculation dispute, beyond the specific matters identified in sections 11753.1 and 11737, subdivision (f). In fact, case law and the records in this case suggest otherwise.

For example, courts have rejected the idea that an insured must first exhaust administrative remedies through an appeal to the Insurance Commissioner before asserting claims of breach of contract against its insurer, including breaches that place the amount of premium in dispute. (See Lance Camper Manufacturing Corp. v. Republic Indemnity Co. (1996) 44 Cal.App.4th 194, 199, 51 Cal.Rptr.2d 622 ( Lance Camper ); Tricor California, Inc. v. State Compensation Ins. Fund (1994) 30 Cal.App.4th 230, 35 Cal.Rptr.2d 550 ; Security Officers Service, Inc. v. State Compensation Ins. Fund (1993) 17 Cal.App.4th 887, 21 Cal.Rptr.2d 653.) "The requirement of exhaustion of administrative remedies is founded on the theory that the administrative tribunal is created by law to adjudicate the issue sought to be presented to the court, and the issue is within its special jurisdiction. If a court allows a suit to go forward prior to a final administrative determination, it will be interfering with the subject matter of another tribunal.... [¶] [However,] [t]he mere possession by some official body of a continuing supervisory or investigatory power does not itself suffice to afford an administrative remedy unless the statute or regulation under which that power is exercised establishes clearly defined machinery for the submission, evaluation and resolution of complaints by aggrieved parties." ( Horsemen's Benevolent & Protective Assn. v. Valley Racing Assn. (1992) 4 Cal.App.4th 1538, 1552–1553, 6 Cal.Rptr.2d 698.) In the workers' compensation insurance arena, "[t]he [Insurance] Commissioner's supervisory and regulatory power over the insurance industry does not give him power to adjudicate all insurance disputes—such as ... one [that] involves an alleged breach of contract with a demand for monetary damages—unless persuasive legislative intent to grant this authority can be identified." ( Lance Camper, supra , at p. 199, 51 Cal.Rptr.2d 622.) The Lance Camper court found no persuasive legislative intent to grant authority to the Insurance Commissioner to consider an insured's causes of action challenging the conduct of the insurer with respect to the insurance contract between them, including a challenge that the amount of the premium was too high as a result of the insurer's wrongful conduct. The Lance Camper court thus determined that the insured's claims were "not ... subject to administrative review." ( Id. at p. 203, 51 Cal.Rptr.2d 622.)

Further, the Insurance Commissioner has concluded that he does not have authority to consider breach of contract issues between insurers and insureds. In In the Matter of the Appeal of SportsMobile West, Inc. (2007) file No. AHB -WCA-06-7 (available at < http://www.insurance.ca.gov/0250-insurers/0500-legal-info/0600-decision-ruling/0100-precedential/intro-06-07.cfm>), the Insurance Commissioner specifically stated that "SCIF correctly argues that the Commissioner does not have jurisdiction to decide the rights and duties of parties to a contract." (Id. at p. 4, fn. 10.) A number of documents in the record in this case further demonstrate not only that the Insurance Commissioner did not view himself as having the authority to determine a contract dispute between the parties, but that the Insurance Commissioner expressed to the parties that his jurisdiction was indeed limited. For example, when ReadyLink initially appealed to the Insurance Commissioner regarding SCIF's application of the USRP rules to determine ReadyLink's payroll for the 2005 policy year, the Department of Insurance sent ReadyLink a letter, dated April 29, 2008, in which an employee of the Department of Insurance informed ReadyLink's representative that "[t]he Insurance Commissioner is authorized by the California Insurance Code to investigate allegations of unlawful activities by licensees. The Department will initiate an investigation into your complaint against the licensee to determine whether the licensee has violated the California Insurance Code. The Department's regulatory activities will be separate from, and will not include, the mediation or negotiation of your complaint. However, if the Department determines from its investigation that your dispute resulted from the licensee's failure to comply with the code, the Department can request that the licensee take corrective action to achieve compliance." (Italics added.)

Later, in the letter sent from the WCIRB to the ALJ assigned to ReadyLink's appeal, the WCIRB states:

"A review of the record indicates that the appellant, ReadyLink Healthcare, Inc. (ReadyLink) is appealing the State Compensation Insurance Fund's (State Fund)[ ] audit of Policy no. 1596579, effective for the period September 1, 2005 to September 1, 2006. ReadyLink is appealing the State Fund's determination that the monies ReadyLink paid to its employees as ‘per diem’ should be included as payroll for premium computation purposes. ReadyLink argues that the payments in question are ‘government per-diem amounts’ and that because ReadyLink ‘does not set them, modify them, negotiate them, nor vary them among nurses,’ the monies meet

the criteria for a reasonable ‘stipulated amount,’ and therefore should not be included as payroll.

"In its February 28, 2008 letter, the State Fund argues that ‘the amounts listed as per diem have not yet been shown to be reasonable’ and therefore must be included as payroll for premium computation purposes. Indeed, the State Fund states that ‘proposing that a vast majority of the nurses’ payroll is for unverified travel expenses, is not reasonable and can not [sic ] be accepted."

"Preliminarily, it should be noted that the WCIRB's jurisdiction in this matter is limited to ensuring that the required Unit Statistical Report [USRP] both accurately reflects the policy's payroll and loss experience, as well as reports all such experience under the appropriate standard classification. However, the WCIRB does not have the authority to make determinations in matters concerning [the] basis of premium disputes between insurers and policyholders. At most, the WCIRB would be able to provide expertise with respect to the California Workers' Compensation Uniform Statistical Reporting Plan's [i.e., the USRP's] provisions regarding the basis of premium for workers' compensation purposes. " (Italics added; underscoring added to demonstrate italics in original.)

Further, the ALJ in this case specifically informed the parties that she was not determining, and in fact could not determine, whether the ultimate premium charged by SCIF was correct. The ALJ specifically stated, "I don't get to say what the premium should be ... because I don't actually know how it's calculated ...." The ALJ also expressed her inability "to rule on" whether ReadyLink would have to pay the premium determined by SCIF, or whether there might be "compromises made down the line." The ALJ clearly did not view her role as determining the accuracy of SCIF's final premium calculation.

Despite all of this, SCIF argues on appeal that ReadyLink was required to exhaust its administrative remedies by asking Insurance Commissioner to determine the correctness of SCIF's calculation of the premium amount and the validity of ReadyLink's affirmative defenses, and that its failure to do so bars it from litigating those issues now. The authority on which SCIF relies in claiming that ReadyLink failed to exhaust its administrative remedies does not support SCIF's assertion. SCIF relies on P. W. Stephens, Inc. v. State Compensation Ins. Fund (1994) 21 Cal.App.4th 1833, 27 Cal.Rptr.2d 107 ( P. W. Stephens ), for the proposition that "a policyholder seeking relief from excessive surcharges must first exhaust administrative remedies before resorting to the courts." However, P. W. Stephens is inapposite. The narrow questions before the court in P. W. Stephens were whether the SCIF was permitted, by statute or regulation , to impose a surcharge on its premiums, and whether arbitrary, exorbitant, discriminatory or unfair surcharges were subject to administrative review. Notably, the Legislature has "specifically required that workers' compensation insurers, including SCIF, not impose any ‘surcharges’ or maintain reserves that are ‘unfairly discriminatory’ " through Insurance Code section 11737.5. ( P. W. Stephens , at p. 1839, 27 Cal.Rptr.2d 107.) The P. W. Stephens court thus concluded that the Legislature had entrusted the Insurance Commissioner to ensure that any surcharges imposed by insurers "are fair and reasonable." ( Id. at p. 1840, 27 Cal.Rptr.2d 107.)

The dispute in P. W. Stephens involved what amounted to a rate-setting dispute, for which administrative exhaustion was a prerequisite to resort to the courts. (See State Compensation Ins. Fund v. Brown (1995) 32 Cal.App.4th 188, 199, 38 Cal.Rptr.2d 98 [distinguishing dispute at issue in P. W. Stephens from contractual dispute initiated by SCIF in which it sought additional premiums from an employer based on SCIF's decision to include independent contractors as employees for purposes of calculating premium].) "There is good reason for deferring to an initial agency determination: the propriety of premium rates and surcharges involve factors and methodology which require quasi-legislative action involving expertise in the subject matter, and courts have traditionally given deference to such agency determinations [citation]." ( Ibid. ) Indeed, the P. W. Stephens court specifically relied on the fact that the Insurance Commissioner's expertise was needed in the area of rate and surcharge setting, areas that are specifically designated by statute as requiring the approval of the Insurance Commissioner, as well as the Insurance Commissioner's creation of a mechanism by which a surcharge could be reviewed, in concluding that administrative exhaustion was required with respect to the dispute at issue there. "Such administrative review is appropriate because of the expertise of the Commissioner and his agency resources and because of the complexity of the matter presented. A determination of whether or not an overall premium, or a surcharge component of a premium, is unfair and discriminatory [as was specifically prohibited under a then-newly-enacted Insurance Code provision] requires a comprehensive understanding of the manner in which the merit rating system schedules are generally applied in the workers' compensation insurance business. Additionally, a reviewing body requires familiarity with the manner in which surcharges are generally applied, and familiarity with the particular occupations or businesses of the insureds in question. Such expertise clearly resides with the Rating Bureau and with the office of the Commissioner and certainly not initially with our trial courts." ( P. W. Stephens, supra , 21 Cal.App.4th at p. 1842, 27 Cal.Rptr.2d 107.) In contrast, issues of contract interpretation, including whether an insurer accurately calculated a premium under the contract, and the application of equitable defenses to the enforcement of a contract, do not involve considerations that fall uniquely within the Insurance Commissioner's expertise. P. W. Stephens thus does not support the conclusion that ReadyLink was required to exhaust administrative remedies before litigating the issues that arise from this contract dispute.

We therefore reject SCIF's suggestion that we may affirm the trial court's ruling on SCIF's motion for judgment on the pleadings on the ground that, to the extent that we have concluded that the issue of the amount of premium due or issues regarding the validity of ReadyLink's affirmative defenses were not in fact determined in the prior administrative proceeding, those issues could have been determined if ReadyLink had properly raised them, and the prior administrative proceeding should therefore act as a bar to ReadyLink raising them in this case under a theory of claim preclusion (see Guerrero v. Department of Corrections & Rehabilitation (2018) 28 Cal.App.5th 1091, 1098, 239 Cal.Rptr.3d 726 [principles of res judicata may be used to bar a party from asserting claims that "could have been litigated" in a prior proceeding] ). The administrative proceeding involved the question whether SCIF had properly interpreted and applied the USRP rules regarding payroll. The question whether SCIF properly applied the USRP rules in including ReadyLink's per diem payments as payroll was well within the Insurance Commissioner's expertise and jurisdiction. Although the answer to that question affected the calculation of the ultimate premium due under the contract between SCIF and ReadyLink, there is no basis to conclude that other matters going to the accuracy of SCIF's premium calculations under the contract—matters not related to issues that involve application of the regulatory rules or rate filings and are therefore within the Insurance Commissioner's adjudicatory jurisdiction—or matters related to whether SCIF can succeed on its contract claim could have been, raised with the Insurance Commissioner.

C. The trial court's denial of ReadyLink's discovery motions was based on an erroneous conclusion regarding the preclusive effect of the prior proceedings

ReadyLink challenges the trial court's order denying its motions to compel discovery from SCIF. We review a trial court's ruling on a motion to compel discovery for abuse of discretion. ( Costco Wholesale Corp. v. Superior Court (2009) 47 Cal.4th 725, 733, 101 Cal.Rptr.3d 758, 219 P.3d 736.) However, " ‘ "[t]he scope of [a court's] discretion always resides in the particular law being applied, i.e., in the ‘legal principles governing the subject of [the] action ....’ Action that transgresses the confines of the applicable principles of law is outside the scope of discretion and we call such action an ‘abuse’ of discretion." ’ [Citation.] An order that implicitly or explicitly rests on an erroneous reading of the law necessarily is an abuse of discretion." ( Williams v. Superior Court (2017) 3 Cal. 5th 531, 540, 220 Cal.Rptr.3d 472, 398 P.3d 69.)

The trial court denied ReadyLink's motions to compel further discovery from SCIF solely on the ground that ReadyLink was "seek[ing] to relitigate the exact same issues already addressed before the Insurance Commission and the Court of Appeal." As we have explained, the prior administrative and judicial proceedings did not decide the issues that SCIF raises in its collection action.

We agree with ReadyLink that because the current action involves factual and legal questions different from the issues that were decided in the prior administrative and judicial proceedings, ReadyLink is entitled to discovery related to those questions. We therefore conclude that the trial court erred in denying ReadyLink's motions to compel and we reverse that order. IV.

DISPOSITION

The judgment of the trial court is reversed. The trial court's order denying ReadyLink's motions to compel further discovery is also reversed. ReadyLink is entitled to costs on appeal.

WE CONCUR:

McCONNELL, P.J.

HALLER, J.