How many days does Medicare allow you to stay in a rehab facility?

Medicare pays for rehab for up to 100 days per benefit period in a skilled nursing facility, or up to 150 days per benefit period in an inpatient rehabilitation facility (with days 91–150 using lifetime reserve days).

📅 Skilled Nursing Facility (SNF) Rehab

• Days 1–20: Fully covered ($0 co-pay) after the Part A deductible.
• Days 21–100: Covered with a daily coinsurance ($204–$217/day depending on the year).
• Day 101+: No coverage; you pay 100% of the cost.
• Rule: Requires a 3-day consecutive inpatient hospital stay beforehand.

🏥 Inpatient Rehabilitation Facility (IRF) / Hospital Rehab

• Days 1–60: Fully covered after the Part A deductible ($1,736 in 2026).
• Days 61–90: Coinsurance of $434 per day.
• Days 91–150: Lifetime reserve days at $868 per day (up to 60 lifetime days total).
• Day 151+: No coverage; you pay all costs.

Medicare pays for a stay in a rehab facility for up to 100 days per benefit period in a skilled nursing facility, or up to 90 days per benefit period (plus 60 lifetime reserve days) in an inpatient rehabilitation facility or hospital rehab unit.

Skilled Nursing Facility (SNF) Rehab

• Duration: Up to 100 days per benefit period.
• Costs (2026): Days 1–20 are fully covered after you meet your Part A deductible ($1,736); days 21–100 require a daily coinsurance ($217 in 2026). After 100 days, you pay all costs.
• Requirements: You must have a qualifying 3-day consecutive inpatient hospital stay (not observation) and need daily skilled care. Coverage can end early if you stop improving or no longer need skilled care.

Inpatient Rehabilitation Facility (IRF) or Hospital Rehab Unit

• Duration: Up to 90 days per benefit period, with an option to use up to 60 lifetime reserve days (extending coverage up to 150 days total).
• Costs (2026): Days 1–60 have a $1,736 deductible with $0 additional daily cost; days 61–90 cost $434 per day; days 91–150 (lifetime reserve days) cost $868 per day. You pay all costs after day 150 (or after day 90 if no reserve days remain).
• Requirements: Requires intensive therapy (typically 3 hours a day, 5 to 7 days a week), doctor supervision, and medical necessity.

You can review complete details and official guidelines directly through Medicare Inpatient Rehabilitation Care Coverage or Medicare Inpatient Hospital Care Coverage.

The "21-day rule" for Medicare typically refers to the cost-sharing shift in a skilled nursing facility (SNF), where Medicare covers 100% of approved costs for the first 20 days, but requires a daily coinsurance payment starting on day 21.

Skilled Nursing Facility Coverage Breakdown

• Days 1–20: Medicare pays 100% of the approved costs (after you meet your Part A deductible).
• Days 21–100: You must pay a daily coinsurance amount, which is $217 per day for 2026.
• Day 101 and beyond: Medicare coverage ends completely, and you are responsible for 100% of the costs.

(Note: In some home health care contexts, a separate "21-day rule" guideline describes intermittent care limits where services are expected to last under 21 days, but the primary financial and coverage definition relates to the transition from day 20 to day 21 in a rehab or skilled nursing setting.)

Medicare or a private Medicare Advantage plan typically denies inpatient rehabilitation because it decides the care is not strictly "medically necessary" or believes the patient can recover safely at a lower, less expensive level of care.

Common Reasons for Denial

• Lower Level of Care: The insurance reviewer decides your needs can be met at home with home health care or in a skilled nursing facility (SNF) instead of an inpatient rehabilitation facility (IRF).
• Not Sick Enough (or Too Sick): The plan concludes your condition has improved enough for discharge, or conversely, that you are too medically unstable or weak to actively participate in and tolerate intensive daily therapy.
• Insufficient Documentation: The medical notes or physician letters do not clearly prove why you need intensive inpatient care rather than standard post-acute care.
• Lack of Prior Authorization: Private Medicare Advantage plans often require formal pre-approval before admitting a patient to inpatient rehab. Recent findings from the Department of Health and Human Services Office of Inspector General show that these private plans deny a high volume of post-acute care requests, though a large share of those initial denials get overturned on appeal.

What You Can Do

• Review the Notice: Read the official denial notice carefully to see the exact reason and deadline for filing an appeal.
• Gather Strong Evidence: Ask your doctor and physical or occupational therapists for detailed notes highlighting your specific functional limitations and fall risks.
• File an Appeal: Submit a fast appeal immediately through your hospital or insurance plan if you believe going home is unsafe.

When Medicare rehab coverage ends, you must either transition to an alternative payment method, appeal the decision, or plan for discharge. Original Medicare covers up to 100 days in a skilled nursing facility per benefit period (100% for the first 20 days, with coinsurance for days 21–100), and stops entirely after day 100.

Immediate Steps to Take

• Review the Notice of Medicare Non-Coverage: The facility must give you this written notice before your coverage stops, explaining why your care is no longer covered.
• File a Fast Appeal: If you believe you still need skilled care and that coverage is ending prematurely, you can request an expedited appeal through your local Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO) by noon of the day before coverage ends.
• Check Your Day Count: Contact the facility’s billing department to confirm exactly which day of your benefit period you are on and whether lifetime reserve days are available.

Options for Covering Continued Care

• Medigap (Medicare Supplement Insurance): If you have a standardized Medigap policy, it may cover out-of-pocket coinsurance costs for days 21–100 or extend inpatient coverage limits, though it will not pay for care in settings that Medicare does not recognize.
• Medicaid: If personal savings are depleted or if income and assets meet low-income thresholds, Medicaid can kick in to cover long-term or extended care. Many individuals qualify for dual eligibility without realizing it.
• Private Pay and Financing: You can pay out-of-pocket on a daily or monthly basis if extended recovery is required before returning home. Ask the facility about sliding-scale fees, nonprofit financial assistance, or custom payment plans.
• Transition to Home Health or Outpatient Therapy: If inpatient care is no longer medically necessary, transition safely by utilizing Medicare Part B for outpatient physical, occupational, or speech therapy.