A Simple Guide to Medicare Parts A, B, C, and D

Medicare’s lettered parts can feel like alphabet soup. The key to making smart choices is understanding what each part actually covers, how you get it, and what you still have to pay out of pocket.

Medicare Part A: Hospital Coverage

Medicare Part A is often called hospital insurance. It helps cover:

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  • Inpatient hospital stays
  • Skilled nursing facility care (after a qualifying hospital stay)
  • Some home health care
  • Hospice care

Many people don’t pay a monthly premium for Part A because they or a spouse paid Medicare taxes while working. You still have costs when you use services, including a deductible for each benefit period and potential daily copayments for longer stays. Part A does not cover long‑term custodial care in a nursing home.

Medicare Part B: Medical Coverage

Medicare Part B is medical insurance. It helps cover:

  • Doctor visits (in person or telehealth)
  • Outpatient care and surgeries
  • Preventive services (like flu shots, screenings, wellness visits)
  • Durable medical equipment (like walkers, wheelchairs, oxygen)

Part B has a monthly premium, which most people pay out of their Social Security check, plus:

  • A yearly deductible
  • Coinsurance, usually a percentage of the Medicare‑approved amount (often 20%) for most services after the deductible

Part B does not cover routine dental, vision, or hearing aids.

Medicare Part C: Medicare Advantage Plans

Medicare Part C, or Medicare Advantage, is an alternative way to get Part A and Part B through a private insurance company approved by Medicare.

Key points:

  • You must first be enrolled in Parts A and B.
  • Most plans include Part D prescription drug coverage.
  • Many plans offer extra benefits like limited dental, vision, hearing, or gym programs.
  • You still pay your Part B premium, and you may owe an additional premium for the plan itself.

Medicare Advantage plans often use provider networks (HMO, PPO). Your costs depend on using network doctors and hospitals, prior authorizations, and plan rules. Each plan sets its own copays and has an annual out‑of‑pocket maximum for covered Part A and B services.

Medicare Part D: Prescription Drug Coverage

Medicare Part D helps cover outpatient prescription drugs. You can get it in two ways:

  • A stand‑alone Part D plan that works with Original Medicare (Parts A and B), or
  • As part of a Medicare Advantage plan with drug coverage (MA‑PD)

Each Part D plan has:

  • A formulary (list of covered drugs) organized into tiers
  • Rules like prior authorization or step therapy for some medications
  • Monthly premiums, plus copays or coinsurance at the pharmacy

Costs vary by plan, the drugs you take, and whether you use a preferred pharmacy.

Putting the Pieces Together

Think of Medicare like this:

  • Part A = hospital care
  • Part B = doctor and outpatient care
  • Part C = all‑in‑one private plan alternative
  • Part D = prescription drugs

Most people choose between:

  • Original Medicare (A and B) + optional Part D + optional Medigap (a separate policy that helps pay deductibles and coinsurance), or
  • A Medicare Advantage plan (Part C), usually with drug coverage included

Once you understand what each part does and how they fit together, it becomes much easier to compare your options and choose the coverage that matches your health needs and budget.