 Most such plans are health maintenance organizations (HMOs) or preferred provider organizations (PPOs).Public Medicare Part C plans, including Medicare Advantage plans, finance at a minimum the same medical services as "Original" Parts A and B Medicare finance via FFS.Public Part C plans, including Medicare Advantage plans, also typically finance additional services, including additional health services; in 2019 extensive non-medical services such as assistance for daily living (ADL) services were added by many plan sponsors.