An employee who has withdrawn as a refund the amounts credited for annuity purposes, and who re-enters service and serves for periods comprising at least 2 years after the date of the last refund paid to him, may have his annuity rights restored by making application to the board in writing for the privilege of reinstating such rights and by compliance with the following provisions:
For an employee who applies to the Fund to reinstate credit and repay a refund between January 1, 1993 and March 1, 1993, the 2 year minimum period of subsequent service required under item (a) shall be instead a period of 6 months.
A person who establishes service credit under Section 9-121.16 may, at the same time, reinstate credit in this Fund and repay a refund without a return to service, notwithstanding the other provisions of this Section.
40 ILCS 5/9-163