California Code, Health and Safety Code - HSC § 1762.4

(b)(1) At least 45 days prior to the expiration of a license issued pursuant to this chapter, the state department shall mail a notice for renewal to the licensee.

(2) A license renewal shall be submitted with the necessary fee in accordance with subdivision (a). A license shall be deemed renewed upon payment of the necessary fee, commencing from the license's expiration date. If the requirements of this section are satisfied, the state department shall issue a license to the facility by the expiration date of the license to ensure the provider remains in good standing. The facility's license shall be mailed within 15 calendar days after the date the state department receives the renewal fee.