Open Season is November 13 – December 11, 2023. California Medical Premiums for 2024 Fee For Service (FFS) and HMO’s Posted on October 15, 2023 by Bobby Donelson Open Season is November 13 – December 11, 2023. California Medical Premiums for 2024 Fee For Service (FFS) and HMO’s 2024 California HMO 2024-California FFS Plans