Medicare’s coverage of a skilled nursing facility stay is not a flat guarantee; it is a taper that tightens in stages. The program pays the full bill for the first 20 days of a covered stay, then shifts the patient into a daily coinsurance charge for days 21 through 100, and stops paying entirely once day 100 passes inside the same benefit period. In 2026, that middle stretch costs $217 a day out of pocket, a bill that starts small and compounds fast. The taper, not a single cutoff date, is what catches families off guard, because coverage thins out well before it disappears.
Why the First 20 Days Cost Nothing
Medicare pays 100 percent of the approved cost of a skilled nursing facility stay for each of the first 20 days of a benefit period, and the patient owes nothing for room, board, or the skilled care itself during that window. The coverage only applies to genuinely skilled care, meaning services like physical therapy, wound management, or intravenous medication that require a licensed nurse or therapist, not the custodial help with bathing or dressing that defines most long-term nursing home stays.
That 20-day window sits inside what Medicare calls a benefit period, a clock that starts the day a patient is admitted to a hospital or skilled nursing facility and does not reset until the patient has gone 60 consecutive days without any inpatient hospital or skilled nursing care. Every day of free coverage, every day of coinsurance that follows, and the eventual cutoff at day 100 are all counted against that single, continuous benefit period rather than against the calendar year or a fixed illness.
A patient can enter and leave a facility more than once and still be inside the same benefit period, so the 20 free days are not renewed just because a stay is interrupted by a short trip home. Only a 60-day break from both hospital and skilled nursing care closes out one benefit period and opens the door to a fresh 20 days of full coverage the next time skilled care is needed, which is why two hospitalizations months apart can land in entirely different coverage positions.
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The $217-a-Day Coinsurance That Starts on Day 21
Once a stay passes day 20, Medicare stops covering the full cost and the patient takes on a daily coinsurance charge for each of days 21 through 100. CMS’s 2026 Medicare costs fact sheet sets that charge at $217 a day, up from $209.50 in 2025. The figure is not an arbitrary number regulators pick each year; it is fixed by law at one-eighth of the annual Part A inpatient hospital deductible, which rose to $1,736 in 2026, so the skilled nursing coinsurance rises automatically whenever the hospital deductible does, without a separate rulemaking specific to nursing facilities.
Because the coinsurance applies to every one of the 80 days between day 21 and day 100, the charge compounds into a large bill quickly for a patient who needs the full stretch of coverage. Eighty days at $217 a day comes to $17,360 in coinsurance alone before Medicare’s payment obligation ends at day 100, a total that falls entirely on the patient’s household unless another form of coverage steps in to absorb it.
Enrollees who pair Original Medicare with certain Medigap policies, including Plans C, D, F, G, M, and N, can have that daily coinsurance covered in full by the supplemental plan, effectively erasing the day-21 bill. Medicare’s own guidance confirms several Medigap plan types pay the skilled nursing facility coinsurance that Original Medicare leaves behind. Medicare Advantage enrollees face a different structure entirely, since private plans set their own daily copays for skilled nursing days, which can run higher or lower than $217 depending on the plan, the network, and how many days of the stay have already passed.
What Happens at the 100-Day Wall, and What Resets It
Medicare’s obligation ends completely once a benefit period reaches day 100 of skilled nursing coverage. From day 101 onward, the program pays nothing toward room, board, or skilled services, leaving the patient, a long-term care policy, or, for those who qualify financially, Medicaid to absorb every remaining dollar. Medicare’s coverage page is explicit that no further skilled nursing facility benefits are available once that limit is reached within the same benefit period.
The only way to regain coverage is the same 60-day reset that governs the rest of the benefit period: a patient must go 60 consecutive days without inpatient hospital or skilled nursing care, then have a new qualifying inpatient hospital stay, before a fresh benefit period, and a fresh 20 days of full coverage, becomes available. A patient discharged shortly before day 100 who later needs skilled care again, without a 60-day gap in between, returns to a benefit period that has little or no coverage left rather than starting the clock over.
That mechanic means the real decision point for most families lands well before day 100, not at the cutoff itself. The daily coinsurance bill that begins on day 21 is the first signal that coverage is finite, giving families weeks of warning to weigh a Medigap policy, a Medicaid spend-down, or a private-pay plan before the wall at day 100 turns a daily bill of $217 into the full, unshared cost of care.
This article was researched and drafted with the assistance of artificial intelligence.
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