Part A is the hospital side of Medicare. Most people get it premium-free because they paid into it for at least 40 quarters — about ten years of work. So when folks hear "free," they figure the hospital is handled and they move on. Then they land in a hospital bed and find out "premium-free" and "no cost" are two very different things.

Let me walk you through what Part A actually pays, where the holes are, and the one rule that surprises almost everyone.

What Part A covers

Four things, basically: inpatient hospital stays, skilled nursing facility care after a qualifying hospital stay, some home health care, and hospice. The big one — the one people picture when they think "hospital coverage" — is the inpatient stay. That's where the numbers below come from.

The deductible isn't yearly. It's per benefit period.

This is the part that catches people. The 2026 Part A deductible is $1,736. Your Part B deductible is once a year. Part A doesn't work that way. It's tied to a benefit period, not the calendar.

A benefit period starts the day you're admitted. It ends once you've been out of the hospital — and out of a skilled nursing facility — for 60 days straight. If you go back in after that 60-day window closes, a new benefit period starts and you pay the $1,736 again.

So here's the math that gets people: two separate hospital stays in the same year, more than 60 days apart, is two deductibles. That's $3,472 in one calendar year, on a benefit Medicare calls "premium-free." There's no yearly cap on how many benefit periods you can rack up.

The daily coinsurance clock

The deductible covers your first 60 days in a benefit period. After that, the meter starts. Here's the 2026 schedule for an inpatient hospital stay:

Days in the hospital	What you pay per day (2026)
Days 1–60	$0 after the $1,736 deductible
Days 61–90	$434 per day
Days 91+ (lifetime reserve days)	$868 per day — you only get 60 of these, ever
After reserve days run out	All costs

Most hospital stays are short, so a lot of people never get past the deductible. But a bad stretch — a long stay, a setback, a second admission — is exactly when the bills get real. That's the scenario Part A leaves you exposed to.

Skilled nursing is the other surprise

Part A covers a skilled nursing facility, but only after a qualifying inpatient hospital stay, and only on a clock:

Days in the SNF	What you pay per day (2026)
Days 1–20	$0
Days 21–100	$217 per day
Day 101+	All costs

Days 21 through 100 at $217 a day is over $17,000 if you go the distance. And this is skilled care — rehab after a fall, that kind of thing. It is not long-term custodial nursing-home care. Part A doesn't cover that at all, which is a different conversation entirely.

Does everyone really get Part A for free?

Most do. About 99% of people pay no Part A premium because they hit 40 quarters of Medicare-covered work. If you didn't, you can still buy in: in 2026 it's $311 a month with 30–39 quarters, or $565 a month with fewer than 30. Worth knowing if your work history is short, or you're counting on a spouse's record.

Where the gap actually lives

Here's the honest summary. Part A is solid coverage for the hospital, but it leaves three doors open: a deductible that can hit more than once a year, daily coinsurance on long stays, and SNF costs after day 20. None of that has an out-of-pocket ceiling on its own.

That's the whole reason a Medicare Supplement exists. Plan G, for example, picks up that Part A deductible and the hospital coinsurance, so a long stay doesn't turn into a five-figure bill. The other route is a Medicare Advantage plan, which caps your yearly out-of-pocket but runs everything through a network. Two different ways to close the same gap — the math and your doctors decide which one fits. If you're new to all of this, the Medicare 101 overview is the place to start.

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