Cal. Education Code § 24333

Upon termination of a disability retirement allowance pursuant to Section 24117, any option elected at the time of retirement pursuant to Section 24332 shall be void as of the effective date of the reinstatement. The preretirement election of option subsequent to termination of the allowance pursuant to Section 24117 shall be subject to the following: (a) A member may not make a preretirement election of option pursuant to Section 24307 prior to becoming qualified to make application for service retirement under Section 24201 or 24203. (b) A member who was receiving an unmodified disability retirement allowance prior to termination of the allowance may not make a preretirement election of option earlier than six months following the date on which the disability retirement allowance was terminated pursuant to Section 24117. (c) A member who has elected an option pursuant to Section 24332, and is otherwise eligible to make a preretirement election of an option, may make the election anytime during the six months following the date on which the disability retirement allowance was terminated pursuant to Section 24117. The member shall elect the same option and designate the same option beneficiary as designated under Section 24332 when making the election during the six-month period following the date the disability retirement allowance was terminated.