California Code, Business and Professions Code - BPC § 3774

On or before the birthday of a licensed practitioner in every other year, following the initial licensure, the board shall mail to each practitioner licensed under this chapter, at the latest address furnished by the licensed practitioner to the executive officer of the board, a notice stating the amount of the renewal fee and the date on which it is due.  The notice shall state that failure to pay the renewal fee on or before the due date and submit evidence of compliance with Sections 3719and 3773 shall result in expiration of the license.

Each license not renewed in accordance with this section shall expire but may within a period of three years thereafter be reinstated upon payment of all accrued and unpaid renewal fees and penalty fees required by this chapter.  The board may also require submission of proof of the applicant's qualifications, except that during the three-year period no examination shall be required as a condition for the reinstatement of any expired license that has lapsed solely by reason of nonpayment of the renewal fee.