Medicare 100 Days Skilled Nursing: What's Actually Covered

Medicare Part A covers up to 100 days of skilled nursing facility care per benefit period. Most families hear "100 days" and assume they have over three months of fully covered rehab. The reality is more complicated — and understanding the rules before your parent is discharged from the hospital can save your family tens of thousands of dollars.

The 100-Day Breakdown

Medicare Part A divides the 100 days into two cost tiers:

Days 1 through 20: Medicare pays 100% of the covered skilled nursing facility costs. No coinsurance, no copay.

Days 21 through 100: The patient pays a daily coinsurance amount. In 2026, that's $217 per day — roughly $6,510 per month out of pocket. Medicare covers the rest.

After day 100: Medicare coverage ends entirely. The patient is responsible for the full private-pay cost. In Alaska, that averages approximately $28,000 per month for a private room in a nursing facility — among the highest rates in the country.

Most Medicare beneficiaries also carry a Medigap supplemental policy or have Medicare Advantage coverage that may reduce or eliminate the days 21-100 coinsurance. Check your parent's specific plan.

The Three-Day Rule

Medicare will only pay for skilled nursing facility care if the patient had a qualifying inpatient hospital stay of at least three consecutive days. The count starts on the day of formal inpatient admission and excludes the day of discharge.

This is where families get blindsided: observation status does not count. If your parent spent three nights in a hospital bed but was classified as an outpatient under "observation status," those days don't satisfy the three-day requirement. Medicare will deny the SNF claim entirely, leaving the family responsible for the full cost from day one.

Hospitals are required to deliver the Medicare Outpatient Observation Notice (MOON) to any patient receiving observation services for more than 24 hours. If you receive this form, immediately ask the attending physician whether reclassification to inpatient status is possible, and factor the observation-status implications into your post-discharge planning.

Exceptions to the Three-Day Rule

Two pathways can waive the three-day inpatient stay requirement:

Medicare Advantage plans. Many private Medicare Advantage (Part C) plans waive the three-day requirement as a standard benefit. The hospital case manager must contact the patient's plan to verify and secure prior authorization before discharge. Don't assume it's waived — confirm in writing.

Accountable Care Organization (ACO) waivers. If your parent's primary care physician participates in an approved Medicare Shared Savings Program or ACO REACH model, the ACO may authorize direct SNF admission without the three-day hospital stay. The facility must hold a CMS rating of three or more stars.

What "Skilled" Actually Means

Medicare doesn't cover custodial care in a SNF — only "skilled" care. The patient must need services that require the training and judgment of licensed professionals: registered nurses, physical therapists, occupational therapists, or speech-language pathologists.

Examples of covered skilled care:

• IV medication administration
• Complex wound care and dressing changes
• Physical therapy to restore walking ability after surgery
• Occupational therapy to relearn self-care activities
• Speech therapy after a stroke

Examples of what is not considered skilled care:

• Assistance with bathing, dressing, and eating (custodial care)
• General supervision of a confused patient
• Medication reminders for oral pills

Once your parent no longer requires skilled services — even if they still need help with daily activities — Medicare coverage ends, regardless of whether 100 days have been used.

Planning for What Comes After

The transition from Medicare-covered SNF care to the next phase is where most Alaska families face a crisis. Options include:

Going home with support. If your parent can manage at home with visiting nurses and therapists, Medicare Part A covers home health care when ordered by a physician. The patient must be homebound and require intermittent skilled care.

Medicaid long-term care. Alaska Medicaid covers nursing facility care for eligible individuals, but Alaska is an income-cap state — if your parent's gross monthly income exceeds $2,982, a Miller Trust (Qualified Income Trust) must be established before they can qualify.

Assisted living via the ALI waiver. The Alaskans Living Independently waiver allows Medicaid-eligible individuals who meet the Nursing Facility Level of Care standard to receive services in a licensed assisted living home, including Pioneer Homes.

The gap between when Medicare SNF coverage ends and when Medicaid or other programs kick in is the most financially dangerous window in eldercare. Our Alaska Hospital Discharge Toolkit maps out the timeline and includes worksheets for tracking eligibility requirements.

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