Cal. Ins. Code § 12975.5
The commissioner may, in any investigation or hearing the commissioner conducts, take or cause to be taken the deposition of any witness residing within or without this state and may pay the expense thereof out of the current support appropriation of the department. The commissioner may pay out of the appropriation to any witness subpoenaed by the commissioner the necessary and reasonable traveling expenses of any witness, to the place of hearing or investigation and return and a per diem of twelve dollars ($12) for each day that the witness is in attendance at or en route to and from the place of hearing or investigation in obedience to the subpoena. The provisions of this section shall not apply to proceedings conducted in accordance with Chapter 5 (commencing with Section 11500) of Part 1 of Division 3 of Title 2 of the Government Code, and those proceedings shall be governed solely by that chapter.
Ca. Ins. Code § 12975.5