California Code, Government Code - GOV § 21160

(a) Any state member who is subject to Section 21159 and does not qualify for industrial disability retirement under this part, or is reinstated from industrial disability retirement pursuant to Section 21195, and accepts another job in state service, shall be paid a partial disability retirement program benefit payment from this system in an amount, to be calculated by the Department of Human Resources and certified to the board, that, when added to the salary earned by the employee in the current state position, would be equal to the state salary earned by the member at the time of becoming unable to perform the duties of his or her previous position. This supplemental payment shall not result in the member being deemed to be retired.

(b) The partial disability retirement program benefit payments made under this section shall be paid for by the state employer in the same manner as all other state retirement benefits are funded.

(c) This section shall not apply to any job-related or job-incurred illness or injury that occurs on or after January 1, 2000.