Cal. Gov. Code § 21419.5
The system shall deduct the amount of interim disability allowance made to a state member pursuant to subdivision (i) of Section 19253.5 from the member's retroactive disability allowance, and reimburse the state agency that has made the interim disability allowance payments. If the retirement disability allowance is not sufficient to reimburse the total interim disability allowance payments, an amount no greater than 10 percent of the member's monthly disability allowance shall be deducted and reimbursed to the state agency until the total interim disability allowance payments have been repaid. The state member and this system may agree to any other arrangements or schedule for the member to repay the interim disability allowance payments. If the disability application is denied, the system shall not be responsible for reimbursing the amount of interim disability allowance paid to the member by the state agency.
Ca. Gov. Code § 21419.5