What is the Medicare 3-day rule for skilled nursing facility coverage?

To qualify for Medicare SNF coverage, your parent must have been admitted as an inpatient to a hospital for at least three consecutive days — not counting the discharge day. Observation status days, even if your parent stayed overnight, do not count. If your parent was classified as "observation status" rather than "inpatient" during a hospital stay, that stay may not qualify for the Medicare SNF benefit, even if the overnight stay itself looked identical.

Does Medicare pay for the full cost of a skilled nursing facility stay?

Medicare covers days 1 through 20 with no daily copay (though the Part A deductible for the hospitalization still applies). For days 21 through 100, Medicare requires a daily coinsurance payment — approximately $200 per day in 2025, though the exact amount adjusts each year. After day 100, Medicare pays nothing for SNF care. Medicare supplement (Medigap) policies may cover part or all of the day 21-100 coinsurance depending on the plan.

What does "medically necessary" mean for Medicare SNF coverage?

Medicare covers SNF care only while the patient requires skilled nursing or skilled therapy services and is making measurable progress toward therapy goals. If a patient reaches a "plateau" — meaning they are no longer making documented progress — Medicare coverage may stop even if the patient hasn't reached day 100. The facility is required to provide written notice before stopping Medicare-covered skilled care.

What happens if my parent needs care after Medicare coverage ends?

After Medicare exhausts, families typically look to one of three sources: a long-term care insurance policy (if your parent has one and the SNF stay qualifies under the policy terms); Medicaid, which covers long-term care for people who meet financial eligibility; or private pay out of pocket. Planning for this possibility before Medicare coverage begins is much easier than scrambling when coverage ends.

Does Medicare cover a second SNF stay if my parent is re-hospitalized?

Yes, if your parent has a new qualifying hospital stay (three or more consecutive inpatient days) for a different or worsening condition, a new benefit period can open and the 100-day benefit resets. If the condition is a recurrence of the same condition treated within 60 days, the SNF benefit period may continue rather than reset — Medicare's rules here are specific. The hospital's discharge team or Medicare directly can clarify which applies.

What Medicare covers at a skilled nursing facility

Part of the Medical transitions for aging parents – before/after plan

Published: June 2026

Medicare covers skilled nursing facility care after a hospitalization — but the benefit comes with rules that many families don't know until they're already in the middle of a SNF stay. Understanding the structure upfront prevents costly surprises and helps families plan for what happens when Medicare ends.

This article explains:

The qualifying hospital stay requirement (the "3-day rule")
The 100-day benefit in plain language
What days 1–20 and days 21–100 each cost
What "medically necessary" means and when Medicare can stop
What happens when Medicare coverage ends and what options exist
How long-term care insurance and Medicaid interact with Medicare SNF coverage

It is educational and is not financial or legal advice. Medicare's rules are subject to change, and coverage depends on your parent's specific plan and situation. Always verify coverage with Medicare or your parent's insurer directly.

For the broader SNF picture:

What is a skilled nursing facility? A guide for families — what SNF care looks like day to day
Home or SNF after hospital discharge: a guide for families — understanding the discharge recommendation
How to choose a skilled nursing facility for a parent — ratings, red flags, how to move fast
Transitioning a parent from SNF back home — planning discharge before Medicare runs out

On this page:

The qualifying hospital stay requirement (the 3-day rule)
The 100-day SNF benefit: what each phase covers and costs
When Medicare can stop before day 100 — and your right to appeal
What happens after Medicare ends: LTCI, Medicaid, and private pay
How to track where your parent is in the benefit period

The qualifying hospital stay requirement: what the 3-day rule actually means

Medicare Part A covers SNF care, but only if your parent meets the qualifying hospital stay requirement. This rule has a specific — and frequently misunderstood — definition.

Your parent must have been admitted as an inpatient to a hospital for at least three consecutive days. The day of discharge does not count. So a patient admitted on Monday, spending Tuesday as an inpatient, and discharged on Wednesday has a two-day qualifying stay, not three.

Observation status does not count. This is the detail that catches families off guard. Hospitals sometimes place patients under "observation status" rather than "inpatient" status — even if the patient spends multiple nights in a hospital bed. From Medicare's perspective, observation status is outpatient care billed under Part B. Observation days do not count toward the three-day inpatient requirement for SNF coverage, even if the experience of those days was identical to an inpatient stay.

If your parent's hospital stay included any days under observation status, ask the hospital billing department to confirm how many days were classified as inpatient. If the three-day inpatient threshold wasn't met, Medicare will not cover a SNF stay that begins directly after that hospitalization.

The SNF stay must begin within 30 days of the qualifying hospital discharge. If your parent goes home after the hospital and then needs SNF care more than 30 days later, a new qualifying hospital stay is typically required.

The SNF must be Medicare-certified. Medicare's Care Compare tool lists all Medicare-certified skilled nursing facilities and their quality ratings. Verify the facility is Medicare-certified before admission if SNF coverage matters.

The 100-day SNF benefit: what each phase covers and costs

Medicare Part A provides up to 100 days of SNF coverage per benefit period, structured in two phases with very different cost-sharing:

Days 1–20: fully covered (after the hospital deductible)

During days 1 through 20, Medicare pays the full cost of covered SNF services — room, board, nursing, and therapy — with no daily copay. However, the Medicare Part A deductible ($1,676 in 2025, adjusted annually) applies to the hospitalization itself and is owed once per benefit period, not once per year.

If your parent has a Medicare supplement (Medigap) plan, the Part A deductible may be partially or fully covered depending on the plan letter.

Days 21–100: significant daily coinsurance

From day 21 through day 100, your parent is responsible for a daily coinsurance payment. In 2025, this is approximately $209.50 per day (the exact amount adjusts each January). Medicare pays the remainder of covered costs.

This is substantial. A 40-day SNF stay — days 1 through 40 — means 20 days at full Medicare coverage followed by 20 days at roughly $200/day out of pocket: approximately $4,000 in coinsurance.

Medicare supplement (Medigap) plans often cover this coinsurance. Plans C and D (and others) typically cover the day 21–100 coinsurance in full or in part. Check your parent's Medigap policy specifically — the details vary by plan letter and insurer.

Medicare Advantage plans (Part C) have different rules. If your parent is enrolled in a Medicare Advantage plan rather than Original Medicare, the SNF cost-sharing structure may differ significantly. Some Medicare Advantage plans have lower copays or different day-count thresholds. Confirm with the specific plan before the SNF stay begins.

Days 101 and beyond: Medicare does not pay

After day 100, Medicare Part A does not contribute to SNF costs. If your parent remains in the facility after day 100 — because it's not yet safe to go home — costs shift entirely to another source: long-term care insurance, Medicaid, or private pay.

When Medicare can stop before day 100 — and your right to appeal

Medicare coverage for a SNF stay is not guaranteed through day 100. Coverage continues only as long as the stay remains "medically necessary" — meaning your parent requires skilled nursing or skilled therapy services and is making measurable documented progress toward their treatment goals.

"Plateau" is the most common reason for early coverage termination. When a patient's therapy progress stalls — meaning they are no longer making meaningful documented gains — Medicare considers skilled therapy no longer necessary and coverage stops. This can happen at day 30 or day 50, long before the theoretical 100-day limit.

The SNF must give you written notice before stopping Medicare coverage. This notice is called the Notice of Medicare Non-Coverage (NOMNC). The facility must deliver it at least two days before Medicare-covered services are scheduled to stop.

You have the right to appeal. If you disagree with the determination that skilled care is no longer necessary, you can request an expedited review from the BFCC-QIO — the same independent Medicare review organization that handles hospital discharge appeals. This request must be made before the coverage termination date stated in the NOMNC. The BFCC-QIO must respond within one to two days. During the appeal, Medicare continues to cover the stay.

If the appeal supports the SNF's determination, you may be responsible for costs starting from the date coverage was scheduled to end — so this decision involves financial risk and should be made carefully, ideally with the social worker.

What happens after Medicare ends: LTCI, Medicaid, and private pay

When Medicare SNF coverage ends — whether at day 100 or earlier due to plateau — families typically look to one of three sources for continuing care costs:

Long-term care insurance (LTCI). If your parent has a long-term care insurance policy, it may cover SNF costs after the Medicare benefit. Key questions to verify: Does the policy cover SNF stays specifically (some cover only home care)? Has your parent satisfied the policy's elimination period? What is the daily benefit limit? LTCI policies vary significantly, and claims require documentation that care meets the policy's benefit triggers (typically inability to perform two or more ADLs without assistance, or cognitive impairment). Start the LTCI claims process before Medicare ends, not after — documentation from the SNF care team is typically required.

Medicaid. Medicaid covers long-term custodial care in nursing facilities for people who meet financial eligibility requirements. The eligibility rules — income limits, asset limits, lookback periods — vary by state and are complex. If Medicaid may become relevant, consult with an elder law attorney before the Medicare benefit ends. Medicaid planning takes time, and acting late can leave families exposed to large out-of-pocket costs.

Private pay. SNF costs for private-pay residents are significant — typically $150 to $350 per day depending on the facility and region. If your parent doesn't have LTCI and doesn't qualify for Medicaid, these costs fall to the family out of pocket or result in a discharge from the SNF.

For families navigating discharge planning when Medicare is ending, the SNF social worker is the key resource. They can help coordinate the transition to home or help determine whether a Medicaid application is appropriate.

How to track where your parent is in the benefit period

Keeping a simple running count of SNF days helps families plan:

Day 1 = the first day in the SNF (not the hospital admission date)
Day 20 = last day of full Medicare coverage
Day 21 = first day of the $200+/day coinsurance period
Day 60 = approaching mid-point; worth meeting with the SNF social worker to discuss discharge planning if not already underway
Day 100 = last day Medicare will pay

Ask the SNF billing department or social worker at admission: "What day of the Medicare benefit period are we starting on?" If your parent had a prior SNF stay within the same benefit period, the day count may not start at 1.

A benefit period begins the day a Medicare beneficiary is admitted as a hospital inpatient and ends when the patient has not received inpatient hospital or SNF care for 60 consecutive days. After 60 days without care, a new benefit period — and new 100-day SNF benefit — can begin.

For questions about your parent's specific coverage situation, Medicare.gov and 1-800-MEDICARE are the authoritative sources. The SNF social worker can also help you understand how your parent's specific plan applies.

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