Cal. Bus. & Prof. Code § 3524
A license or approval that has expired may be renewed at any time within five years after its expiration by filing an application for renewal on a form prescribed by the board and payment of all accrued and unpaid renewal fees. If the license or approval is not renewed within 30 days after its expiration, the licensed physician assistant and approved supervising physician, as a condition precedent to renewal, shall also pay the prescribed delinquency fee, if any. Renewal under this section shall be effective on the date on which the application is filed, on the date on which all renewal fees are paid, or on the date on which the delinquency fee, if any, is paid, whichever occurs last. If so renewed, the license shall continue in effect through the expiration date provided in Section 3522 or 3523 which next occurs after the effective date of the renewal, when it shall expire, if it is not again renewed.
Ca. Bus. and Prof. Code § 3524