What is Medicare?
Medicare is the federal health insurance program for people 65 or older, and for some people under 65 with certain disabilities, End-Stage Renal Disease (ESRD) or amyotrophic lateral sclerosis (ALS). It's run by the Centers for Medicare & Medicaid Services (CMS), and enrollment in Parts A and B goes through Social Security (SSA).
Medicare has four parts (A, B, C and D) and can be supplemented with a Medigap policy. There are three main paths: Original Medicare (government Parts A and B, with Part D for drugs), Original Medicare with Medigap (a Supplement that helps with what A and B don't pay) or Medicare Advantage (Part C, plans from Medicare-approved private insurers). Understanding how they fit together is the first step to deciding calmly.
Last reviewed: October 5, 2026 · Reviewed by licensed agents of Aion Insurance Group, US Enrollment Center's partner agency · Sources: Medicare.gov, SSA.gov, CMS.gov.
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