Medicare covers most of your hospital bills for up to 90 days in a single benefit period, but what you pay and how long coverage lasts depends on which part of Medicare you have and how your stay is classified.

If you have Original Medicare (Part A), the hospital stay itself is covered after you pay a deductible — currently $1,556 per benefit period, though this amount changes yearly. You pay nothing for days 1 through 60. Days 61 through 90 cost you a daily copay (currently $389 per day). After day 90, you enter what Medicare calls "lifetime reserve days" — 60 additional days you can use across your entire lifetime, each costing $778 per day.

If you have a Medicare Advantage plan (Part C), the rules are different. Your plan sets its own limits on hospital stays, copays, and how many days are covered. Some plans cover the full 90 days like Original Medicare; others limit coverage to 30 or 45 days. You need to check your plan's documents or call the plan directly to know your actual coverage.

The length of your stay is not decided by Medicare or your insurance — it is decided by your doctor and the hospital. Medicare will pay for medically necessary inpatient care for as long as your doctor says you need it, up to the limits above. If your doctor says you can go home and recover there, Medicare stops paying for the hospital bed even if days remain in your benefit period.

Key Takeaways

  • Original Medicare Part A covers up to 90 days of hospital care per benefit period after you pay the deductible, with copays starting on day 61.
  • You have 60 lifetime reserve days you can use after your 90 covered days run out, but once they are gone, they cannot be renewed.
  • Medicare Advantage plans set their own hospital stay limits, which may be shorter than Original Medicare, so you must check your plan documents.
  • Your doctor and hospital decide when you are ready to leave; Medicare pays for medically necessary inpatient care within your coverage limits.
  • A new benefit period begins when you have been out of the hospital for 60 days in a row, resetting your 90-day and copay counters.

How a Medicare Benefit Period Works

A benefit period is Medicare's way of measuring your coverage year for hospital stays. It does not follow the calendar year. Instead, it starts the day you enter the hospital as an inpatient and ends 60 days after you leave.

If you are admitted to the hospital on March 15, your benefit period begins that day. If you leave on March 20, your benefit period ends on May 19 (60 days later). If you are readmitted to the hospital on May 10, you are still in the same benefit period because you have not been out for the full 60 days. If you are readmitted on May 20 or later, a new benefit period starts.

This matters because your copays reset with each new benefit period. If you used 70 of your 90 covered days in the first period, those days do not carry over. When the new period begins, you start fresh with 90 covered days and a new deductible to pay.

What Original Medicare Part A Actually Covers During a Hospital Stay

Original Medicare Part A covers the hospital room, meals, nursing care, lab tests, imaging, and medications given to you in the hospital. It does not cover the doctor's bill — that is covered by Part B. It does not cover a private room unless medically necessary, and it does not cover a television or phone in your room.

You are responsible for the Part A deductible before coverage begins. After that, days 1 through 60 are fully covered. On days 61 through 90, you pay a copay for each day. If you stay longer than 90 days and use your lifetime reserve days, you pay a higher copay for each reserve day used.

If your hospital stay is classified as observation rather than inpatient admission, Part A coverage works differently. Observation stays are shorter-term monitoring, and Medicare counts them differently for payment purposes. You may end up paying more out of pocket for an observation stay than for a short inpatient stay, even if you are in the same hospital bed. Ask the hospital to clarify whether you are being admitted as an inpatient or placed on observation.

Medicare Advantage Hospital Coverage and Limits

If you are enrolled in a Medicare Advantage plan, your coverage for hospital stays is determined by your specific plan, not by the Original Medicare rules above. Some plans mirror Original Medicare and cover up to 90 days per benefit period. Others cover fewer days — 30, 45, or some other number set by the plan.

Your plan documents list the hospital copay amount and the maximum number of days covered. If your plan covers only 30 days and you need to stay 45 days, you will owe the full cost for days 31 through 45 unless your plan has a different rule for extended stays. Call your plan's member services line before a planned hospital stay to confirm how many days are covered and what your copay will be.

Some Medicare Advantage plans require you to use an in-network hospital. If you go to an out-of-network hospital, your copay may be higher or coverage may be limited. Emergency situations are usually an exception — plans must cover emergency care at any hospital — but confirm this with your plan if you are worried about a specific situation.

What Happens When Your Hospital Coverage Runs Out

If you have used all 90 of your covered days and all 60 of your lifetime reserve days under Original Medicare, Medicare will not pay for any more inpatient hospital care. You become responsible for the full cost of the hospital stay. This is rare — most people do not stay in the hospital for 150 days — but it can happen with serious, long-term illnesses.

If you reach this point, talk to the hospital's financial counselor about payment plans, charity care programs, or Medicaid. Some hospitals have funds to help uninsured or underinsured patients. Medicaid, if you are also enrolled, may cover costs that Medicare does not. The hospital social worker can also discuss whether moving to a skilled nursing facility or rehabilitation center might be appropriate, as those settings have different Medicare coverage rules.

If you have a Medicare Advantage plan and run out of covered days, the same applies — you owe the full cost. Your plan does not extend coverage beyond its stated limits. However, if you also have Medicaid, it may cover the gap.

Skilled Nursing Facility Care After Hospital Discharge

After a hospital stay of at least three consecutive days, Medicare Part A may cover a move to a skilled nursing facility (SNF) for continued recovery. This is different from a regular nursing home. A skilled nursing facility provides medical care and rehabilitation — physical therapy, occupational therapy, nursing services — not just daily living information.

Medicare covers up to 100 days in a skilled nursing facility per benefit period. You pay nothing for days 1 through 20. Days 21 through 100 cost you a copay (currently $194.50 per day). After 100 days, you pay the full cost.

To be covered, your doctor must order the skilled nursing facility care, and you must be admitted within 30 days of leaving the hospital. The facility must be Medicare-certified. If you are unsure whether a facility is skilled nursing or just a regular nursing home, ask before you are discharged from the hospital — the difference in cost to you is significant.

How to Find Out Your Exact Coverage Before a Hospital Stay

The best time to understand your hospital coverage is before you need it. If you have Original Medicare Part A, your coverage is the same nationwide — 90 days per benefit period, with the copays and deductible amounts listed above. You can verify your coverage by calling Medicare at 1-800-MEDICARE or logging into your Medicare.gov account.

If you have a Medicare Advantage plan, call your plan's member services number (on your insurance card) and ask: How many days of hospital care does my plan cover per benefit period? What is my copay per day? Do I need to use an in-network hospital? What happens if I stay longer than the covered days? Write down the answers and keep them with your insurance card.

If you are facing a planned hospital stay, ask your doctor's office to contact your insurance company before the procedure to confirm coverage. Many hospitals have financial counselors who can also verify your coverage and explain what you will owe. Getting this information in advance prevents surprises after you are discharged.

Frequently Asked Questions

Does Medicare cover the full cost of a hospital stay?

No. You pay a deductible before coverage begins, and you pay copays for days 61 through 90 under Original Medicare. Medicare Advantage plans have their own copays and may have different limits. Neither covers doctor bills, which are billed separately under Part B.

What is the difference between inpatient and observation status?

Inpatient means you are admitted to the hospital for treatment and recovery. Observation means you are being monitored but may go home the same day or next day. Observation stays are not counted the same way for Medicare payment, and you may owe more out of pocket. Ask the hospital to clarify your status when you arrive.

Can I use my lifetime reserve days more than once?

No. You have 60 lifetime reserve days total under Original Medicare Part A. Once you use them, they are gone forever. They do not renew each year. Use them only when you have exhausted your 90 covered days in a benefit period and truly need more hospital care.

What if I am still in the hospital when my benefit period ends?

Your benefit period does not end while you are still an inpatient. It ends 60 days after you are discharged. If you are discharged and readmitted within 60 days, you are in the same benefit period and your copays continue where they left off. If you are readmitted after 60 days, a new benefit period begins.

Does my Medicare Advantage plan cover the same hospital days as Original Medicare?

Not necessarily. Some plans cover 90 days like Original Medicare, but others cover fewer. Check your plan documents or call member services to find out your specific limits. The copay amount also varies by plan.