California Code, Education Code - EDC § 24212

(a) If a disability allowance granted under this part after June 30, 1972, is terminated for reasons other than those specified in Section 24213 and the member does not return to employment subject to coverage under the Defined Benefit Program, the member's service retirement allowance, when payable, shall be based on projected service, excluding credited service accrued or granted pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820), or Chapter 19 (commencing with Section 23200), projected final compensation, and the member's age on the last day of the month in which the retirement allowance begins to accrue.  The allowance payable under this section, excluding annuities payable from accumulated annuity deposit contributions, shall not be greater than the disability allowance the member was eligible to receive immediately prior to the earlier of the termination of that allowance or at normal retirement age, excluding children's portions.

(b) The allowance shall be increased by an amount based on any credited service accrued or granted pursuant to Section 22717 or 22717.5 or Chapter 14 (commencing with Section 22800) or Chapter 14.2 (commencing with Section 22820) or Chapter 19 (commencing with Section 23200), the member's age on the last day of the month in which the retirement allowance begins to accrue, and final compensation using compensation earnable, or projected final compensation, or a combination of both.

(c) If the total amount of credited service, other than projected service or credited service that accrued or was granted pursuant to Sections 22717, 22717.5, and 22826, except as provided in subdivision (c) of Section 22121, is equal to or greater than 30 years, the amounts identified in subdivisions (a) and (b) shall be calculated pursuant to Sections 24203.5 and 24203.6.

(d) Upon retirement, the member may elect to modify the service retirement allowance payable in accordance with any option provided under this part.