California Code, Business and Professions Code - BPC § 704

(a) Pay the renewal fee; provided, that the renewal fee shall be waived for a physician and surgeon who certifies to the Medical Board of California that license restoration is for the sole purpose of providing voluntary, unpaid service to a public agency, not-for-profit agency, institution, or corporation which provides medical services to indigent patients in medically underserved or critical-need population areas of the state.

(b) If the board requires completion of continuing education for renewers of an active license or certificate, complete continuing education equivalent to that required for a single license renewal period.