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What Is Medicare?

Medicare made simple: what it is, who it covers, and what it costs. Call 1-800-MEDIGAP.

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Quick answer

Medicare is the U.S. government's health insurance program for people age 65 and older and certain younger people with disabilities. It has four parts: A (hospital), B (medical), C (Medicare Advantage), and D (prescription drugs), and covers over 68 million Americans.

If you are approaching 65 or helping a loved one, here is a clear, jargon-free explanation of what Medicare is and how it works.

What is Medicare and who runs it?

Medicare is the federal health insurance program created in 1965 and administered by the Centers for Medicare & Medicaid Services (CMS). It provides health coverage to Americans 65 and older and to younger people with qualifying disabilities or conditions like ALS and end-stage renal disease. Funded through payroll taxes, premiums, and general revenue, Medicare is one of the largest health programs in the world. It is not a single plan but a set of parts you combine to fit your needs. Call 1-800-MEDIGAP to learn which parts you need.

How does Medicare actually work?

You typically start with Original Medicare (Parts A and B), which lets you see any provider nationwide that accepts Medicare. You then decide how to handle the gaps: add a Part D drug plan and a Medicare Supplement (MEDIGAP) policy, or instead choose a private Medicare Advantage (Part C) plan that bundles everything. Original Medicare pays roughly 80% of Part B costs, leaving the rest to you. Because that exposure has no cap, most people add supplemental coverage. A licensed agent at 1-800-MEDIGAP can explain the path that fits you best.

More on Medicare Basics & Enrollment

Frequently asked questions

What is Medicare in one sentence?+

Medicare is federal health insurance for people 65 and older and certain younger people with disabilities, organized into Part A (hospital), Part B (medical), Part C (Medicare Advantage), and Part D (prescription drugs).

When did Medicare start?+

Medicare was signed into law in 1965 and began covering beneficiaries in 1966. It is administered by the Centers for Medicare & Medicaid Services (CMS) and today covers more than 68 million Americans, the majority of whom are age 65 and older.

Is Medicare health insurance?+

Yes, Medicare is government-sponsored health insurance. It pays for a large share of hospital, doctor, and prescription costs but not all of them, which is why many beneficiaries add a MEDIGAP supplement or choose a Medicare Advantage plan. Call 1-800-MEDIGAP to learn more.

Do I have to pay for Medicare?+

Most people pay no premium for Part A but do pay a monthly Part B premium, $202.90 standard in 2026, plus deductibles and coinsurance (CMS). Medicare is not free, so understanding the costs before enrolling helps you budget. A licensed agent at 1-800-MEDIGAP can explain.

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What Is Medicare? Simple 2026 Guide | 1-800-MEDIGAP