What is Medicare?Medicare is federal health insurance. It is primarily for America’s seniors, but also some people under age 65 with certain disabilities and those of any age with end-stage renal disease (ESRD).

The Centers for Medicare & Medicaid Services (CMS) administers the program, while the Social Security Administration (SSA) enrolls most individuals.*

There are 4 parts of Medicare:

Part A – Hospital
Part B – Medical
Part C – Medicare Advantage 
Part D – Prescription Drug Program 

*The nation’s railroad workers pay Medicare taxes to the federal railroad administrative system rather than the SSA. These workers and their dependents are enrolled in Medicare through the U.S. Railroad Retirement Board.

Read Next: What Does Medicare cover?
Find Out: What is Original Medicare?
Return to: Medicare Basics

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