N.Y.C. Admin. Code § 13-219: § 13-219 Re-entry into membership after withdrawal of contributions.

If a member has received benefits under section 13-240 of this subchapter, his or her member-service credit at the time of leaving service shall be restored in full provided such member returns to service within five years after leaving service and redeposits the total amount so withdrawn. Subsequent contributions shall be at the rate applicable to his age on re-entry to service.