Medicare Part A covers up to 100 days of skilled nursing facility care per benefit period. The first 20 days cost you nothing. Days 21 through 100 carry a daily coinsurance of $217 in 2026. After day 100, Medicare pays nothing and you are responsible for the full cost.1Medicare.gov. Skilled Nursing Facility Care Reaching all 100 days is not automatic, though. Several eligibility rules can cut the count short or disqualify the stay entirely, and the one that surprises the most families is the three-day hospital rule.
What You Pay for Each Stretch of Days
Medicare structures the 100 days into three cost tiers within a single benefit period:
- Days 1 through 20: $0 per day, assuming you have already met the Part A deductible for the benefit period. That deductible is $1,736 in 2026 and is typically applied during the hospital stay that preceded the SNF admission.2Centers for Medicare & Medicaid Services. 2026 Medicare Parts A and B Premiums and Deductibles
- Days 21 through 100: $217 per day in coinsurance. Medicare covers the rest.1Medicare.gov. Skilled Nursing Facility Care
- Day 101 onward: full cost. Medicare coverage ends.1Medicare.gov. Skilled Nursing Facility Care
The coinsurance stretch is where the bill grows. A patient who runs the full 80 days from day 21 to day 100 would owe $17,360 in coinsurance alone. Once coverage stops at day 101, private-pay rates for a semi-private room average roughly $300 or more per day nationally.
The Rules That Have to Be Met Before Day One Counts
Getting Medicare to pay for any of those 100 days depends on a set of conditions that all have to hold at the same time.
A Qualifying Three-Day Inpatient Hospital Stay
Before Medicare covers SNF care, you need an inpatient hospital stay of at least three consecutive days. The count starts the day you are formally admitted as an inpatient and does not include the day you are discharged. After the hospital, you generally must enter the SNF within 30 days.1Medicare.gov. Skilled Nursing Facility Care
Watch for Observation Status
You can spend several nights in a hospital bed, receive medications and monitoring, and still not qualify, because you were never formally admitted as an inpatient. If a doctor places you under “observation services,” Medicare treats that time as outpatient care and none of it counts toward the three-day requirement.3Medicare.gov. Inpatient or Outpatient Hospital Status Affects Your Costs
Inpatient versus observation is a billing classification, not a description of where you physically are. You could be in the same room getting the same care as the person in the next bed who was formally admitted. Hospitals are required to give you a Medicare Outpatient Observation Notice (MOON) if you receive observation services for more than 24 hours.3Medicare.gov. Inpatient or Outpatient Hospital Status Affects Your Costs If a SNF stay looks likely, ask directly whether the admission is inpatient or observation. Do not assume.
Exceptions to the Three-Day Rule
Some patients are exempt. Medicare Shared Savings Program Accountable Care Organizations in two-sided risk tracks (BASIC track Levels C, D, or E, or the ENHANCED track) can apply for a waiver that lets their patients enter an SNF without the three-day hospital stay.4Centers for Medicare & Medicaid Services. Skilled Nursing Facility 3-Day Rule Waiver Guidance Many Medicare Advantage plans also waive or modify the requirement. If you are on Medicare Advantage rather than Original Medicare, check your plan.
Skilled Care, Related Condition, Certified Facility
Beyond the hospital stay, three more conditions have to be true. A doctor must determine that you need daily skilled care, such as intravenous medications, physical therapy, or other rehabilitation services. The skilled care must be for a condition treated during the qualifying hospital stay, or a new condition that developed while you were receiving SNF care for the original one. And the facility itself must be Medicare-certified.1Medicare.gov. Skilled Nursing Facility Care
How the 100 Days Can Restart
There is no cap on how many benefit periods you can have. A benefit period begins the day you are admitted as an inpatient in a hospital or SNF and ends when you have gone 60 consecutive days without inpatient hospital or skilled nursing care.5Medicare.gov. Inpatient Hospital Care Coverage Once that 60-day gap closes, a new benefit period can start with a fresh 100-day clock after another qualifying hospital stay. You would also owe a new Part A deductible.
Leaving the SNF for a shorter break works differently. If you return within 30 days, you do not need a new three-day hospital stay, but your existing benefit period continues and you pick up where you left off in the day count rather than starting over at day one.6Medicare.gov. Medicare Coverage of Skilled Nursing Facility Care Use 40 days, leave for two weeks, come back, and you have 60 days remaining.
When Medicare Cuts Off Coverage Before Day 100
The 100 days is a ceiling, not a guarantee. Medicare’s SNF benefit is designed for active rehabilitation and skilled medical treatment. If your condition improves to the point where you only need help with everyday tasks like bathing and dressing, Medicare treats that as custodial care and will stop covering the stay even if you are still inside your 100-day window.
If the facility tells you Medicare will stop paying, it must give you a written Notice of Medicare Non-Coverage at least two days before your covered services end. You have the right to a fast appeal, and the deadline is tight: you must contact the independent reviewer no later than noon the day before the coverage termination date listed on the notice. The appeal goes to a Beneficiary and Family Centered Care-Quality Improvement Organization (BFCC-QIO), and Medicare generally keeps paying while the QIO reviews your case.7Medicare.gov. Fast Appeals Facilities sometimes issue these notices earlier than they should, and QIO reviewers regularly overturn premature discharge decisions.
What Picks Up After Medicare Stops
Medigap Can Cover the Days 21–100 Coinsurance
If you have Original Medicare with a Medigap policy, some plan letters pay the $217 daily coinsurance for you. Plans C, D, F, and G cover the full SNF coinsurance amount. Plan K covers 50% and Plan L covers 75%. Plans A, B, M, and N do not cover SNF coinsurance at all.8Medicare.gov. Compare Medigap Plan Benefits Plan F is only available to people who became eligible for Medicare before January 1, 2020. The difference between a plan that covers the coinsurance in full and one that does not can reach $17,360 over a single extended stay.
Medicaid After Day 100
When the 100 days run out and skilled nursing is still needed, Medicaid is the primary safety net for long-term care. It is a joint federal-state program with income and asset limits that vary by state. Many states offer “medically needy” or spend-down programs that let people with higher incomes qualify by counting medical expenses against their income until they fall below the state threshold. Spousal impoverishment protections under federal law let the non-applicant spouse keep a certain amount of assets and income, with specifics that vary by state.9Medicaid.gov. Eligibility Policy Applying for Medicaid nursing home coverage is complex enough that many families work with an elder law attorney.