Real Coverage, Real Limits
Medicare does cover skilled nursing facility (SNF) care — the short-term, skilled rehabilitation or nursing you might need after a hospital stay. But this benefit is one of the most misunderstood in all of Medicare, because people confuse it with long-term nursing home coverage, which Medicare largely does not provide (see what Medicare won't pay for long-term care). The SNF benefit is short-term and rehabilitative by design.
Understanding the exact rules — the qualifying stay, the 100-day limit, and the cost structure — helps you plan and avoid a painful surprise if a rehab stay runs long.
The Qualifying Hospital Stay
Before Medicare covers any SNF care, you generally need a qualifying inpatient hospital stay of at least three consecutive days. This is where the observation-vs-inpatient distinction becomes critical: days spent under 'observation' status don't count toward the three-day requirement, even if you were in a hospital bed. Someone who spends three nights under observation and then needs rehab can find Medicare covers none of the SNF stay.
This is why we tell people to ask their status every day of a hospital stay. Many Medicare Advantage plans waive the three-day requirement, but Original Medicare and Medigap follow it strictly.
The 100-Day Cost Structure
Once you qualify, Medicare's SNF coverage runs on a clear schedule per benefit period:
- Days 1–20: Medicare pays 100% — you owe nothing for covered SNF services
- Days 21–100: a daily coinsurance applies (a set amount that increases annually)
- After day 100: Medicare covers nothing — you're responsible for all costs
- The clock resets with a new [benefit period](/blog/medicare-hospital-benefit-periods) after 60 days out of care
Where This Leaves You — and How to Prepare
The days 21–100 coinsurance and the hard stop at 100 days are meaningful exposure. A Medicare Supplement plan covers the days 21–100 coinsurance, removing that cost entirely — one of the quieter but valuable Medigap benefits. But no supplement extends coverage past 100 days, because that's a program limit, not a cost-sharing gap.
For care needs beyond 100 days — genuine long-term custodial care — you're into different territory: private pay, long-term care insurance, or Medicaid after spending down assets. Planning for that possibility before it happens is one of the most valuable things a retiree can do, and it's part of the broader conversation we have with clients about long-term care, at no cost.
Frequently Asked Questions
How many days of skilled nursing does Medicare cover?
Up to 100 days per benefit period, and only after a qualifying 3-day inpatient hospital stay. Days 1–20 are fully covered; days 21–100 require daily coinsurance; after day 100 Medicare covers nothing.
Does Medicare cover long-term nursing home care?
No. Medicare's skilled nursing benefit is short-term and rehabilitative, capped at 100 days. Long-term custodial care is not covered by Medicare — that's paid privately, through long-term care insurance, or by Medicaid after a spend-down.
Do observation days count toward the 3-day requirement?
No. Only inpatient days count. Time spent under 'observation' status doesn't qualify you for SNF coverage, even if you were in a hospital bed — one reason to confirm your admission status daily.
Does a Medicare Supplement help with skilled nursing costs?
Yes. Medigap plans cover the days 21–100 coinsurance, eliminating that cost. But no supplement extends coverage past Medicare's 100-day limit, since that's a program cap rather than cost-sharing.
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