Medicare covers some drug and alcohol rehabilitation services, but not all types of treatment and not without limits

Medicare Part A (hospital insurance) covers inpatient rehabilitation stays for substance use disorder when you are admitted to a hospital or a certified rehabilitation facility. Medicare Part B (medical insurance) covers outpatient counseling and some medications used in treatment. However, Medicare does not cover all rehabilitation programs — particularly residential treatment centers that are not hospital-based, and it places strict limits on how long it will pay.

The type of facility matters enormously. A program run inside a hospital or attached to one will likely be covered. A standalone residential center, even an excellent one, usually will not be. Your out-of-pocket costs depend on which part of Medicare is paying, how long you stay, and whether you have supplemental insurance.

Key Takeaways

  • Medicare Part A covers inpatient rehabilitation in hospitals and certified rehab facilities, but you pay a daily copay after the first 20 days, and coverage ends after 100 days in a benefit period.
  • Medicare Part B covers outpatient counseling through community mental health centers and office-based visits, plus medications like methadone and buprenorphine used in addiction treatment.
  • Standalone residential treatment centers that are not hospital-affiliated are typically not covered by Medicare, even if they are high-quality programs.
  • You should ask your doctor whether the specific facility is Medicare-certified and confirm the expected length of stay before admission, because costs rise sharply after day 20.

What Medicare Part A covers for inpatient rehabilitation

If you are admitted to a hospital for detoxification or acute withdrawal, Medicare Part A covers the hospital stay. If you then move to a skilled nursing facility or certified rehabilitation facility for ongoing treatment, Part A continues to cover that stay as well. The facility must be Medicare-certified, which most major rehabilitation hospitals are.

You pay nothing for the first 20 days of a covered inpatient stay. From day 21 through day 100 in a single benefit period, you pay a daily copay (in 2024, this is $194.50 per day, though this amount changes yearly). After 100 days, Medicare stops paying for that benefit period, and you are responsible for all costs. A benefit period begins when you are admitted and ends 60 days after you are discharged.

This means a 30-day inpatient program costs you nothing for the first 20 days, then $194.50 per day for the remaining 10 days. A 60-day program costs nothing for 20 days, then $194.50 daily for the next 40 days. If you need longer treatment, you will pay out of pocket unless you have supplemental insurance that covers these copays.

What Medicare Part B covers for outpatient treatment

Medicare Part B covers outpatient counseling and therapy for substance use disorder when provided by a licensed mental health professional in an office, clinic, or community mental health center. This includes individual therapy, group counseling, and family counseling. You pay 20% of the Medicare-approved amount after you meet your annual Part B deductible (in 2024, this is $240, though it changes yearly).

Part B also covers medications used in addiction treatment, including methadone (used mainly for opioid addiction) and buprenorphine (used for opioid addiction and sometimes alcohol use disorder). These are covered when prescribed by a doctor and dispensed through a pharmacy or clinic. You pay your usual Part B copay or coinsurance for these medications.

Outpatient programs do not have a day limit the way inpatient stays do. However, Medicare requires that the treatment be medically necessary and that you see a doctor regularly to monitor your progress. If you stop attending sessions or your doctor determines treatment is no longer needed, Medicare may stop paying.

Types of rehabilitation Medicare does not cover

Medicare does not cover residential treatment centers that operate independently of a hospital, even if they are well-regarded and provide excellent care. This is the single biggest gap in Medicare coverage for addiction treatment. Many people seeking rehabilitation prefer residential programs because they provide 24-hour support in a structured environment, but if the center is not hospital-based or hospital-certified, Medicare will not pay.

Medicare also does not cover sober living homes or halfway houses, which provide housing and peer support but not medical treatment. These are considered housing, not medical care. Some state Medicaid programs cover these, but Original Medicare does not.

Luxury or specialty rehabilitation programs — those marketed as high-end or exclusive — are not covered unless they happen to be Medicare-certified facilities. Marketing and amenities do not change Medicare's coverage rules.

How to learn about a specific facility is Medicare-covered

Before you or a family member enters a rehabilitation program, call the facility directly and ask: "Are you Medicare-certified?" If the answer is yes, ask which part of Medicare covers your stay — Part A (inpatient) or Part B (outpatient). Write down the answer.

You can also check the Medicare Care Compare tool on Medicare.gov, which lists certified facilities by location and type. Search for "skilled nursing facilities" or "rehabilitation facilities" in your area. The tool shows whether each facility accepts Medicare and what services it provides.

Call your Medicare plan (or Medicare directly at 1-800-MEDICARE if you have Original Medicare) and ask whether the specific facility is in-network and what your out-of-pocket costs will be. Give them the facility name and the expected length of stay. This conversation takes 10 minutes and can save you thousands of dollars in unexpected bills.

What happens if you need treatment longer than Medicare covers

If you complete a 100-day inpatient stay and still need treatment, Medicare will not pay for additional inpatient days in that benefit period. At that point, you have three options: pay out of pocket, transition to outpatient treatment (which has no day limit), or look into whether your state's Medicaid program covers extended residential care.

Some people move from inpatient to outpatient care partway through their stay to extend the total length of covered treatment. For example, you might spend 60 days inpatient, then transition to intensive outpatient counseling three times per week. This is medically appropriate for many people and allows you to stay in treatment longer while using your Medicare benefits more efficiently.

If you have a Medigap or Medicare Advantage plan, check your policy documents or call your plan to see whether it covers inpatient copays or extends coverage beyond 100 days. Some plans do; most do not.

Questions to ask your doctor before entering a program

Before admission, ask your doctor these specific questions: Is this facility Medicare-certified? Which part of Medicare will cover my stay — Part A or Part B? How long does the program typically last? What will my out-of-pocket costs be for that length of stay? If I need to stay longer, what are my options? Does my plan cover any costs beyond what Original Medicare covers?

Write down the answers and ask for them in writing if possible. If your doctor recommends a facility that is not Medicare-certified, ask why — sometimes there is a medical reason — and ask whether a Medicare-certified alternative exists nearby.

Frequently Asked Questions

Does Medicare cover medication-assisted treatment like methadone or buprenorphine?

Yes, Medicare Part B covers these medications when prescribed by a doctor. You pay 20% of the Medicare-approved cost after your annual deductible. Some community health centers and opioid treatment programs that are Medicare-certified may have different cost structures, so ask about your specific out-of-pocket amount when you start treatment.

What if I need detox before I can enter a rehabilitation program?

If you are admitted to a hospital for medical detoxification, Medicare Part A covers that stay. Once you are medically stable, you can move to a rehabilitation facility, and Part A continues to cover it if the facility is Medicare-certified. The days count toward your 100-day limit, so a 10-day detox plus a 60-day rehab program uses 70 of your 100 covered days.

Will Medicare cover a rehabilitation program recommended by my doctor if it is not hospital-based?

No. A doctor's recommendation does not change Medicare's coverage rules. Medicare covers inpatient treatment only in hospitals or hospital-certified facilities. If your doctor recommends a non-hospital residential program, you would need to pay out of pocket or explore whether your state Medicaid program covers it.

Can I use Medicare to pay for a family member's rehabilitation if they are on my plan?

No. Medicare covers only the person whose name is on the Medicare card. If a family member needs treatment, they must have their own Medicare coverage or another form of insurance. Some states offer Medicaid coverage for substance use treatment regardless of age or income during active treatment, so that is worth exploring.

What should I do if a rehabilitation facility says it is not accepting Medicare?

Ask why. Some facilities have stopped accepting Medicare because the reimbursement rate is lower than they prefer, but this is a business choice, not a coverage rule. You can ask whether the facility will make an exception or whether it can refer you to a Medicare-certified alternative. You can also contact your state's substance abuse agency or call 1-800-MEDICARE to find certified programs in your area.