Medicare covers certain medical services and items in hospitals and other settings. Some are covered under Medicare Part A, and some are covered under Medicare Part B. As long as you have both Part A and Part B, these services and items are covered whether you have the Original Medicare Plan, or you belong to a Medicare Advantage Plan (like an HMO or PPO).
(Primary Source: Centers for Medicare and Medicaid Services - Medicare and You Handbook. This content may have been enhanced by Q1Group LLC to include further examples, explanations, and links.)
Medicare Supplements fill the gaps in your Original Medicare