The governing body of any city, county, or city and county, in addition to anyone else properly entitled, including the Public Employees’ Retirement System, may request the appeals board to determine in any case, and the appeals board shall determine, whether or not the disability referred to in Section 4850 arose out of and in the course of duty. The appeals board shall also, in any disputed case, determine when the disability commenced and ceased, and the amount of benefits provided by this division to which the employee is entitled during the period of the disability. The appeals board shall have jurisdiction to award and enforce payment of these benefits pursuant to Part 4 (commencing with Section 5300).