Part A in One Sentence
Medicare Part A is hospital insurance: it covers inpatient 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 for at least 10 years while working. That 'free' label is why Part A feels simple — but the coverage has real limits and real costs once you're actually admitted.
Understanding Part A matters because it's only one piece of the puzzle. It pairs with Part B (medical insurance) to form Original Medicare, and the gaps it leaves are exactly what a Medicare Supplement or Medicare Advantage plan is designed to address. If you're new to all of this, our Medicare 101 guide lays out how the four parts fit together.
The Four Things Part A Covers
Part A's coverage falls into four buckets, each with its own rules:
- Inpatient hospital care: your room, nursing, meals, and hospital services once a doctor formally admits you (this admission status matters enormously — see our guide on [observation vs. inpatient status](/blog/observation-vs-inpatient-hospital-status))
- Skilled nursing facility care: short-term rehab or skilled care after a qualifying 3-day inpatient hospital stay — not long-term custodial care
- Hospice care: comprehensive end-of-life care for those with a terminal illness, one of Medicare's most complete benefits
- Home health care: limited skilled nursing and therapy at home when you're homebound and a doctor orders it
What Part A Costs When You Use It
Here's where 'premium-free' gets misleading. When you're admitted to the hospital, Part A charges a deductible per benefit period — $1,736 in 2026 — not per year. A benefit period starts when you're admitted and ends after you've been out of the hospital for 60 consecutive days, so a person hospitalized twice in a year with a gap between could owe the deductible twice. After 60 days in a single stay, daily coinsurance kicks in and climbs the longer you stay.
Skilled nursing follows a similar pattern: the first 20 days are covered in full after a qualifying hospital stay, then a daily coinsurance applies for days 21–100, and after 100 days Part A covers nothing. These cost-sharing amounts, with no annual cap, are precisely the exposure a Medigap plan is built to absorb — our Plan G vs. Plan N comparison walks through how supplements handle it.
What Part A Doesn't Cover
Part A stops at the hospital door in important ways. It does not cover doctor services during your stay (that's Part B, even when you're an inpatient), outpatient care, prescription drugs you take at home (that's Part D), routine long-term custodial care, or most care outside the United States. The most costly misunderstanding is long-term care: Part A's skilled nursing benefit is short-term and rehabilitative, not the ongoing custodial care many people eventually need — we cover that gap in what Medicare won't pay for long-term care.
Because Part A alone leaves these gaps, almost nobody relies on it by itself. The real decision is how you cover what Part A and Part B don't — and that's where an independent comparison of your options actually saves money. If you already have coverage and wonder whether it's still a good deal, our 5 signs you're overpaying for Medicare walks through what to look for.
Frequently Asked Questions
Is Medicare Part A really free?
There's usually no monthly premium if you or your spouse worked and paid Medicare taxes for at least 10 years (40 quarters). But Part A still has costs when you use it — notably a $1,736 deductible per benefit period in 2026 — so 'premium-free' doesn't mean 'no cost.'
Do I have to sign up for Part A?
If you're already receiving Social Security when you turn 65, you're usually enrolled in Part A automatically. If not, you enroll during your Initial Enrollment Period. See our guide on whether you'll be automatically enrolled.
Does Part A cover doctor visits in the hospital?
No — the doctors who treat you during an inpatient stay bill under Part B, not Part A. Part A covers the facility side (room, nursing, meals); Part B covers the physician services.
How many days will Part A cover in the hospital?
Part A covers a hospital stay with the deductible for days 1–60, daily coinsurance for days 61–90, then 'lifetime reserve days,' after which you pay all costs. Most stays are far shorter than this, but the long-stay exposure is real and uncapped without a supplement.
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