California Code, Business and Professions Code - BPC § 2833

(a) Each certificate issued pursuant to this article shall be renewable biennially, and each person holding a certificate under this article shall apply for a renewal of their certificate and pay the biennial renewal fee required by Section 2830.7 every two years on or before the last day of the month following the month in which their birthday occurs, beginning with the second birthday following the date on which the certificate was issued, whereupon the board shall renew the certificate.

(b) Each certificate not renewed in accordance with this section shall expire but may within a period of eight years thereafter be reinstated upon payment of the biennial renewal fee and penalty fee required by Section 2830.7 and upon submission of proof of the applicant's qualifications as may be required by the board. During the eight-year period, no examination shall be required as a condition for the reinstatement of any expired certificate that has lapsed solely by reason of nonpayment of the renewable fee. After the expiration of the eight-year period the board may require, as a condition of reinstatement, that the applicant pass an examination as it deems necessary to determine their present fitness to resume the practice of nurse anesthesia.