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Inpatient or observation? Why your hospital status matters

Staying overnight doesn't make you an inpatient. How hospital status is decided, what it changes about your costs and nursing home coverage, the MOON notice, and how to appeal.

Checked against official sources on October 27, 2026 · How we check facts

You can spend a night or more in a hospital bed and still be an outpatient. Whether you're an inpatient or an outpatient "under observation" changes what you pay, and whether Medicare covers nursing home care afterward.

How status is decided

  • You're an inpatient only from the time the hospital formally admits you with a doctor's order.
  • An inpatient admission is generally appropriate when your doctor expects you to need medically necessary hospital care over 2 or more midnights.
  • Emergency room care, observation and outpatient surgery without an admission order are outpatient care, even overnight.

What it changes

  • Inpatient: Part A covers the hospital stay after the Part A deductible ($1,736 per benefit period in 2026). Part B covers doctors.
  • Outpatient (observation): Part B covers doctors and hospital services. You pay a copay for each outpatient hospital service plus 20% for doctors. A single service's copay can't be more than the inpatient deductible, but all of them together can be.
  • Nursing home care afterward: Medicare covers skilled nursing facility care only after a hospital stay of at least 3 inpatient days in a row. Time under observation or in the ER before admission doesn't count. Some Medicare Advantage plans and certain Accountable Care Organizations waive the 3-day rule.

Know your status

  • Each day, you or your caregiver should ask the doctor, the hospital or a social worker: "Am I an inpatient or an outpatient?"
  • If you're under observation for more than 24 hours, the hospital must give you a Medicare Outpatient Observation Notice (MOON), explaining why and how it affects your costs.

If you're switched from inpatient to observation

If the hospital admits you as an inpatient and then changes you to "outpatient getting observation services," you should get a Medicare Change of Status Notice (CMS-10868) before you leave. Ask for it if you don't. You can ask for a fast appeal from your state's Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO), ideally while you're still in the hospital; it usually decides in about 2 days. You can still appeal after you leave by following the notice's instructions.

This applies to hospital stays from February 14, 2025 on. The separate process for older stays closed to new requests on January 2, 2026, except for good cause.

Common questions

If I stay overnight in the hospital, am I an inpatient?

Not necessarily. You're an inpatient only after the hospital formally admits you with a doctor's order. Observation, ER care and outpatient surgery are outpatient care even if you stay overnight.

Does observation count toward the 3-day rule for skilled nursing care?

No. Medicare needs at least 3 inpatient days in a row before it covers skilled nursing facility care. Time under observation or in the ER before admission doesn't count.

What is a MOON notice?

The Medicare Outpatient Observation Notice. Hospitals must give it to you if you're under observation for more than 24 hours. It explains why you're an outpatient and how that affects your costs.

Can I appeal being changed from inpatient to observation?

Yes. For stays from February 14, 2025 on, you should get a Medicare Change of Status Notice and can ask your BFCC-QIO for a fast appeal, ideally while still in the hospital.

Sources

General information, not advice about a specific plan.