Medicare Basics
Plain English
Medicare has different "parts" covering different things: hospital stays, doctor visits, private plan alternatives, and prescription drugs. Understanding which part covers what helps explain why many people also carry supplemental coverage.
What is it?
Medicare Part A generally covers inpatient hospital care. Part B generally covers outpatient/doctor services. Part C (Medicare Advantage) is a private-plan alternative that bundles Part A and B coverage (often with extras). Part D covers prescription drugs. Supplemental ("Medigap") policies can help cover gaps in Original Medicare (Parts A and B).
Why does it matter?
Original Medicare (Parts A and B) doesn't have an out-of-pocket maximum and doesn't cover prescription drugs by default — understanding this is why many beneficiaries pair it with a Part D plan and/or supplemental coverage, or choose Medicare Advantage instead.
How does it work?
Enrollment has specific windows (an Initial Enrollment Period around age 65, and other special/general periods) — missing them can result in a permanent late-enrollment penalty for some parts, which is why enrollment timing itself matters.
Risks and limitations
Medicare rules, premiums, and enrollment penalties are set by federal law and can change — this is a conceptual overview, not current enrollment guidance. Verify current rules directly with Medicare.gov or the Social Security Administration before making an enrollment decision.
Questions to ask a professional
Which parts of Medicare am I enrolling in, and when is my enrollment window? Do I need supplemental coverage or a Part D plan to fill gaps in Original Medicare? Does Medicare Advantage make sense compared to Original Medicare plus supplemental coverage for my situation?