Cal. Business and Professions Code § 4966

Except as provided in Section 4969, a license that has expired may be renewed at any time within three years after its expiration by filing of an application for renewal on a form provided by the board, paying all accrued and unpaid renewal fees, and providing proof of completing continuing education requirements. If the license is not renewed prior to its expiration, the acupuncturist, as a condition precedent to renewal, shall also pay the prescribed delinquency fee. Renewal under this section shall be effective on the date on which the application is filed, on the date on which the renewal fee is paid, or on the date the delinquency fee is paid, whichever occurs last. If so renewed, the license shall continue in effect through the expiration date provided in Section 4965, after the effective date of the renewal, when it shall expire and become invalid if it is not again renewed.