Medicare Parts A, B, C, and D — explained simply

Original Medicare, Advantage, Part D, Medigap — the alphabet soup trips everyone up. Let's untangle exactly what each part covers and how they fit together.

📖 8 min read · Educational guide · Updated 2026

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Quick answer

Part A covers hospital stays. Part B covers doctors and outpatient care. Together they're "Original Medicare." Part C (Medicare Advantage) is a private all-in-one alternative. Part D covers prescription drugs.

Medicare is built from four parts, labeled A through D. The labels don't explain themselves, so here's each one in plain language — and a simple way to keep them straight.

Part A — Hospital insurance

Part A covers inpatient care: hospital stays, skilled nursing facility care, hospice, and some home health care. Most people pay no monthly premium for Part A because they (or a spouse) paid Medicare taxes while working.

Easy way to remember: A is for Admitted — the care you get when you're admitted to a hospital.

Confused which Medicare path fits you?I can walk you through Parts A/B/C/D against your actual doctors and prescriptions in one short conversation.

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Part B — Medical insurance

Part B covers outpatient care: doctor visits, preventive care, lab tests, medical equipment, and many services you get without being admitted. Part B has a standard monthly premium that most people pay.

Easy way to remember: B is for the Basics of everyday medical care — your doctor visits and checkups.

Together, Part A and Part B are called Original Medicare — the coverage provided directly by the federal government.

Part C — Medicare Advantage

Part C, better known as Medicare Advantage, is an all-in-one alternative offered by private insurance companies approved by Medicare. An Advantage plan bundles your Part A and Part B together, and usually includes Part D drug coverage — often adding extras like dental, vision, or hearing.

If you choose Advantage, you still have Medicare; you're just getting your benefits through a private plan instead of directly from the government. These plans use networks and have their own rules, which is why comparing them carefully matters.

Easy way to remember: C is for Combined — it combines your coverage into one plan.

Part D — Prescription drug coverage

Part D covers prescription medications. You can get it as a standalone plan (added to Original Medicare) or built into a Medicare Advantage plan. Each Part D plan has its own list of covered drugs, so the right one depends entirely on the specific medications you take.

Easy way to remember: D is for Drugs.

What about "Medigap"?

You'll also hear about Medigap (also called Medicare Supplement). These are separate private policies that help pay the out-of-pocket costs Original Medicare leaves behind — like deductibles and coinsurance. We cover how Medigap compares to Advantage in a separate guide.

The takeaway

Original Medicare = Part A (hospital) + Part B (doctors). From there you choose how to round it out: either Medicare Advantage (Part C), or Original Medicare plus a drug plan (Part D) and possibly a Supplement. We'll walk through which path fits you when you're ready.

Which path is right for you depends on your doctors, your medications, and your budget — exactly the things worth talking through before you decide.

Now let's apply this to your situation.

Reading is the first step — the next is seeing what it means for you specifically. Let's go through your doctors, medications, and budget together and find the coverage that actually fits. That's the part I'll handle with you, in plain English.

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