Whenever the subject of the conference is a claim or complaint for which written offers have been filed pursuant to section ten, the order or arbitrator's award modifying, terminating, or denying modification or termination of weekly compensation benefits shall reflect the amount so filed by one or other of the parties, or by a conciliator on behalf of a party, and shall not require any payment, modification or termination which has not been proposed by either party unless the judge or arbitrator provides a detailed written explanation of why neither submitted amount could reasonably be believed to accurately compensate the employee for his earning capacity. Whenever, with respect to a case in which liability is not an issue, a claim for additional compensation or a complaint to discontinue or modify compensation is among the issues before the administrative judge or arbitrator, if written amounts have not been filed at conciliation as hereinbefore provided, or are unavailable on the date of the conference or arbitration for any other reason or if the judge or arbitrator determines that a party that has previously filed an amount with a conciliator in good faith has subsequently acquired new information regarding earning capacity not available at the time of conciliation, the administrative judge or arbitrator shall require or, in case of newly discovered information, allow such filings at the close of the conference or arbitration, and the order or award shall reflect one of the offers so filed and not substitute any other amount unless the judge or arbitrator provides a detailed written explanation of why neither submitted amount could reasonably be believed to accurately compensate the employee for his earning capacity.
Nothing in this section shall restrict the authority of an administrative judge to order weekly benefits or health care services for a closed period into the future or to order that such benefits or services be initiated, modified, or terminated at a particular date in the future.
Failure to file a timely appeal or withdrawal of a timely appeal shall be deemed to be acceptance of the administrative judge's order and findings, except that a party who has by mistake, accident or other reasonable cause failed to appeal an order within the time limited herein may within one year of such filing petition the commissioner of the department who may permit such hearing if justice and equity require it, notwithstanding that a decree has previously been rendered on any order filed, pursuant to section twelve.
Mass. Gen. Laws ch. 152, § 10A