Medicare covers 100 percent of hospital bills only under specific conditions, and only for a limited time

Medicare Part A covers inpatient hospital stays, but it does not cover the full bill for the entire stay. Instead, it covers all costs after you pay a deductible — a one-time amount per benefit period. Once you meet that deductible, Medicare pays 100 percent of covered hospital charges for days 1 through 60 of your stay. After day 60, you begin sharing costs with Medicare through coinsurance (a daily amount you pay out of pocket). The coverage ends entirely after 90 days, unless you have additional hospital days available through your lifetime reserve.

The key word is "covered" charges. Medicare does not pay for everything a hospital bills. It pays for a semiprivate room, meals, nursing care, medications, lab work, and other medically necessary services. It does not pay for a private room (unless medically necessary), a television, a telephone, or personal care items. Understanding what counts as a covered charge matters because you may owe the full amount for anything outside that list.

Key Takeaways

  • You pay a deductible once per benefit period; after that, Medicare covers 100 percent of hospital charges for days 1 through 60.
  • On days 61 through 90, you pay coinsurance (a daily amount) while Medicare covers the rest of the bill.
  • After 90 days, your coverage ends unless you use lifetime reserve days, which are limited and carry a higher coinsurance amount.
  • Medicare covers only medically necessary services; you pay the full amount for private rooms, phone, television, and personal items unless they are medically necessary.
  • A new benefit period begins after you have been out of the hospital for 60 consecutive days, which resets your deductible and day count.

What the deductible covers and when you pay it

The Part A deductible is a fixed amount you pay once per benefit period before Medicare begins paying. The deductible amount changes each year; it is set by Medicare and applies to all beneficiaries. You pay this deductible only once, even if you have multiple hospital stays within the same benefit period.

A benefit period begins the day you enter the hospital and ends 60 days after you leave. If you are readmitted to the hospital within those 60 days, you do not pay a second deductible — you are still in the same benefit period. If you stay out of the hospital for 60 consecutive days and then return, a new benefit period begins and you owe a new deductible.

Days 1 through 60: When Medicare pays 100 percent

After you pay the deductible, Medicare covers 100 percent of all covered hospital charges for the first 60 days of your stay. This means Medicare pays the full cost of your room, meals, nursing care, medications, tests, and other medically necessary services. You pay nothing out of pocket for these covered services during this period.

This 100 percent coverage applies only to covered charges. If the hospital bills for something Medicare does not cover — such as a private room you requested for comfort rather than medical need — you owe that bill in full. Ask the hospital billing department or your nurse which charges are covered by Medicare and which you may be responsible for.

Days 61 through 90: When you share costs with Medicare

Starting on day 61 of your hospital stay, you begin paying coinsurance — a daily amount set by Medicare each year. Medicare pays the remainder of the covered charges. This coinsurance amount is the same regardless of how much the hospital actually charges; you pay a fixed daily rate, and Medicare covers everything else.

The coinsurance amount is lower than the deductible but applies for each day you remain in the hospital. If you stay in the hospital for 30 days in this period (days 61 through 90), you pay coinsurance for all 30 days. After day 90, your coverage under the standard benefit period ends.

Days 91 and beyond: Lifetime reserve days

If you need to stay in the hospital longer than 90 days, you may use lifetime reserve days. These are additional days of coverage that Medicare provides, but they are limited — you have only 60 lifetime reserve days total across your entire life. Once you use them, they are gone.

When you use a lifetime reserve day, you pay a higher coinsurance amount than you did on days 61 through 90, and Medicare covers the rest. Because these days are limited and nonrenewable, many people use them only when facing a very long hospital stay. After your 60 lifetime reserve days are exhausted, Medicare covers nothing, and you pay all hospital bills out of pocket.

What happens when a new benefit period begins

A new benefit period starts after you have been out of the hospital for 60 consecutive days. This means your day count resets to 1, and you owe a new deductible before Medicare begins paying again. Your coinsurance amounts and lifetime reserve days also reset in terms of how they explore to the new stay — though your lifetime reserve days themselves do not increase (you still have only 60 total across your life).

Understanding the 60-day rule matters if you are discharged and then readmitted. If you return to the hospital on day 59 after discharge, you are still in the same benefit period and do not owe a new deductible. If you return on day 61 or later, a new benefit period begins and you owe a new deductible.

Charges Medicare does not cover

Medicare Part A does not cover certain items and services, even during the days when it pays 100 percent of covered charges. You are responsible for the full bill on these items. Common examples include a private room (unless medically necessary), a television or telephone in your room, personal grooming items, and meals for a visitor.

Some services may be covered in one situation but not another. For example, a private room is covered if your condition requires isolation or if no semiprivate rooms are available. Ask your hospital or your Medicare Summary Notice (the bill you receive after discharge) which charges fell outside Medicare coverage. If you believe a charge should have been covered, you can file an appeal with Medicare.

How to prepare for hospital costs you will owe

Before a planned hospital stay, contact your hospital's billing department and ask what your out-of-pocket costs will be. Tell them you have Medicare Part A and ask them to estimate your deductible and any coinsurance based on the expected length of stay. Some hospitals have financial counselors who can walk you through these numbers.

If you have a Medigap policy (supplemental insurance) or a Medicare Advantage plan, your coverage of these costs may be different. Medigap policies often cover the Part A deductible and coinsurance amounts. Medicare Advantage plans have their own rules for hospital coverage. Review your policy documents or call your plan before you are admitted so you know what you will owe.

Frequently Asked Questions

If I am in the hospital for 30 days, do I owe anything?

You owe the Part A deductible before day 1. After that, Medicare covers 100 percent of covered charges for those 30 days, so you owe nothing else for covered services. You may owe for any noncovered items, such as a private room you requested for comfort.

What if I am readmitted to the hospital 45 days after I was discharged?

You are still in the same benefit period because you have not been out of the hospital for 60 consecutive days. You do not owe a new deductible. Your day count continues from where it left off, so if your first stay was 30 days, this stay begins on day 31.

Can I use my lifetime reserve days all at once, or do they spread across multiple stays?

You can use them however your hospital stays require. If you use 20 lifetime reserve days in one stay, you have 40 left for the rest of your life. They do not renew each year — once they are used, they are gone.

Does Medicare cover the full bill if I stay in the hospital for 60 days?

Yes, Medicare covers 100 percent of covered charges for days 1 through 60, after you pay the deductible. On day 61, you begin paying coinsurance. If your stay is exactly 60 days, you owe only the deductible (assuming all charges are covered by Medicare).

What should I do if I receive a hospital bill for something I think Medicare should have covered?

Contact Medicare at 1-800-MEDICARE or log into your Medicare account online to file an appeal. You can also ask the hospital to explain why the charge was not covered. Keep copies of all bills and correspondence in case you need to appeal.