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Understanding Medicare Parts A & B

A plain-English guide to what Original Medicare covers — and what it doesn't.

Scott BlackScott Black
June 12, 20268 min read
Understanding Medicare Parts A & B

TL;DR

Original Medicare is Parts A (hospital) and B (medical). It covers most inpatient and outpatient care but leaves gaps in deductibles, coinsurance, dental, vision, hearing, and prescription drugs. Most beneficiaries pair it with either a Medicare Supplement (Medigap) plus a Part D plan, or with a Medicare Advantage plan.

What Part A covers

Part A is the hospital-insurance half of Original Medicare. It pays for inpatient hospital stays, skilled nursing facility care after a qualifying hospital stay, hospice care, and some home health services.

Most people pay no Part A premium because they or a spouse paid Medicare taxes for at least 10 years (40 quarters) while working. There is, however, a Part A deductible for each benefit period — reset by 60 days of no inpatient care.

  • Inpatient hospital care (semi-private room, meals, general nursing, drugs administered during the stay).
  • Skilled nursing facility care following a 3-day inpatient hospitalization.
  • Hospice care for terminally ill patients with a life expectancy of six months or less.
  • Home health care that is medically necessary, part-time or intermittent.

What Part B covers

Part B is the medical-insurance half. It pays for doctor visits, outpatient care, preventive services, durable medical equipment, most lab work, and mental-health services.

Part B has a monthly premium (adjusted by income through IRMAA), a small annual deductible, and after that Medicare typically pays 80% of the approved amount for most services — leaving you responsible for the remaining 20% with no cap.

Important: no out-of-pocket maximum

Original Medicare has no yearly cap on what you pay in coinsurance. A serious illness can generate thousands in 20% cost-sharing. This is the single biggest reason most beneficiaries pair Original Medicare with a Medicare Supplement (Medigap) plan or choose a Medicare Advantage plan instead.

What Original Medicare does not cover

  • Most prescription drugs (you need a stand-alone Part D plan).
  • Routine dental, vision, and hearing care.
  • Long-term custodial care in a nursing home.
  • Most care received outside the United States.

How to fill the gaps

There are two common paths. A Medicare Supplement (Medigap) (Medicare Supplement (Medigap)) policy pairs with Original Medicare and covers most or all of your share of costs, and you add a stand-alone Part D drug plan. A Medicare Advantage (Part C) plan replaces Original Medicare with a private plan that usually includes drug coverage plus extras like dental, vision, and a gym benefit.

There is no single best path — the right answer depends on your doctors, your medications, how often you travel, and your budget. Scott's job is to walk through both options honestly and help you choose.

Educational only. This article is provided for general information and does not constitute individualized insurance advice. Medicare plan availability, benefits, premiums, and networks change annually. Scott Black is a licensed insurance agent doing business as Florida Health Resources. We do not offer every plan available in your area. For a complete list of Medicare options, visit Medicare.gov or call 1-800-MEDICARE (TTY: 1-877-486-2048). See our compliance notice.
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