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Does Medicare Cover Rehab?

Yes. Under the Mental Health Parity and Addiction Equity Act (MHPAEA), Medicare must cover substance use treatment at parity with medical care. This page covers typical benefits, in-network facilities, and how to verify your specific plan.

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Quick answer: Medicare covers medically necessary detox, inpatient/residential, IOP/PHP, outpatient therapy, and MAT. Typical deductible range: $240-1,632. Typical copay/coinsurance: 20%. Pre-authorization is common for inpatient/residential.

Medicare Rehab Coverage at a Glance

Parent company

Centers for Medicare & Medicaid Services

Members covered

65+ million

Typical deductible range

$240-1,632

Typical copay/coinsurance

20%

Member services phone

1-800-MEDICARE

Call the number on your member card for plan-specific details.

Medicare consists of four parts, each covering different aspects of SUD treatment: Part A (inpatient hospital / inpatient detox), Part B (outpatient including IOP/PHP and MAT office visits), Part C (Medicare Advantage — private insurer administration of A+B+D+supplemental), and Part D (prescription MAT medications). Understanding which part covers which service is essential — many members mistakenly think "Medicare doesn't cover rehab" because they're looking at the wrong part.

Behavioral health managed by

Direct CMS administration (Original Medicare) or private insurer (Medicare Advantage)

Out-of-pocket maximum

No cap on Original Medicare; $4,900-$8,850 on Medicare Advantage (2026)

Typical initial authorization

Part A: benefit periods (60-day lifetime reserve); MA plans: 5-7 day initial auth

Where Medicare operates

All 50 states + territories

Medicare Plan Types — What Each Covers for Rehab

Not all Medicare plans cover rehab the same way. Coverage depends heavily on the plan type printed on your member ID card. Below is how each common Medicare plan type handles substance use treatment.

Part A — Inpatient Hospital

Covers inpatient detox and medically managed withdrawal at a hospital. $1,632 deductible per benefit period in 2026. No coinsurance days 1-60.

Part B — Outpatient / Professional Services

Covers PHP, IOP, outpatient therapy, MAT office visits, and psychiatric services. 20% coinsurance after $240 annual deductible.

Part C — Medicare Advantage

Private plans administer A+B+D together with added behavioral benefits. Variable cost-share; often $0-$500 per inpatient admission.

Part D — Prescription Drugs (MAT)

Covers buprenorphine, naltrexone, disulfiram, and acamprosate. Methadone for OUD is covered under Part B (administered at OTP), not Part D.

What Does Medicare Typically Cover?

Medical Detox

3–7 days medically supervised withdrawal

Find Medical Detox centers →

Inpatient / Residential

28–90 days of 24/7 care

Find Inpatient / Residential centers →

Partial Hospitalization (PHP)

20+ hours/week daytime program

Find Partial Hospitalization (PHP) centers →

Intensive Outpatient (IOP)

9–15 hours/week

Find Intensive Outpatient (IOP) centers →

Standard Outpatient

Individual + group therapy

Find Standard Outpatient centers →

Medication-Assisted Treatment

Buprenorphine, methadone, naltrexone

Find Medication-Assisted Treatment centers →

How to Verify Your Medicare Coverage

1
Find your member ID card — member services phone is on the back. For Medicare: 1-800-MEDICARE.
2
Ask specifically: "Is behavioral health / substance use treatment covered under my plan? What's my deductible and coinsurance? Is pre-authorization required?"
3
Ask for in-network providers — or call our helpline and we'll verify while you wait.
4
Get written confirmation of benefits (BOB letter) to take to the facility. Most rehab centers call to re-verify before admission.
5
Check our facility directory — facilities that accept Medicare.

Medicare Coverage — What's Unique

Major 2020 and 2024 Medicare policy changes significantly expanded SUD access. In 2020, Medicare began covering Opioid Treatment Programs (OTPs) for methadone — previously, Medicare didn't cover methadone for OUD, forcing seniors to pay out-of-pocket. In 2024, Medicare expanded coverage of intensive outpatient programs (IOP) under Part B, matching commercial insurance parity. Also, unlike commercial insurance, Original Medicare has no annual or lifetime limits on medically necessary SUD treatment — but it does have complex benefit-period rules for inpatient (60 days full, 30 days at coinsurance, 60 lifetime reserve days).

Common Medicare denial reasons (and how to avoid them)

Most Medicare rehab denials fall into a handful of predictable categories. Knowing them before admission lets your facility's utilization review team submit a stronger first-time authorization request.

Facility not Medicare-certified — critical for Part A claims. Many rehabs accept commercial insurance but are not CMS-certified.
Wrong place-of-service code — residential rehab billed under the wrong code (e.g., SNF vs hospital) can trigger denial.
Custodial care determination — Medicare does not cover extended residential stays considered "custodial" rather than active treatment.
Medicare Advantage prior-auth skipped — unlike Original Medicare, MA plans require prior authorization for inpatient SUD.

If Medicare denies your claim — appeal timeline

Medicare appeals have five levels: Redetermination (120 days to file), Reconsideration (180 days), Administrative Law Judge (60 days), Medicare Appeals Council (60 days), and federal court (60 days). Expedited appeals for current care decided within 72 hours at every level.

Don't give up on a first denial. Industry data from the Kaiser Family Foundation shows that fewer than 1% of denied claims are appealed — but when they are, roughly 40% of first-level appeals succeed.

Related Resources

Finance guide

How to Pay for Rehab Without Insurance

8 proven funding paths if Medicare doesn't apply.

Finance guide

Credit, Lease & Bills During Rehab

30-day pre-rehab financial checklist.

Tool

Rehab Cost Calculator

Estimate your out-of-pocket with Medicare.

Frequently Asked Questions About Medicare Coverage

Does Medicare cover all types of rehab?

Under MHPAEA, Medicare covers medically necessary levels of care: detox, inpatient/residential, PHP, IOP, outpatient, and MAT. "Medically necessary" means a licensed provider has assessed and recommended the level of care. Luxury/experiential amenities beyond clinical care are usually not covered.

Do I need pre-authorization with Medicare?

Most Medicare plans require pre-authorization for inpatient/residential and PHP. Outpatient and MAT typically do not. Your intake coordinator at the facility usually handles this — but confirm during your initial call to the facility.

What about out-of-network facilities?

HMO plans typically don't cover out-of-network rehab except in emergencies. PPO/EPO plans may offer partial out-of-network coverage at higher cost-share. Verify your specific plan type on your member card or by calling 1-800-MEDICARE.

Does Medicare cover family therapy during my treatment?

Yes, family therapy sessions are covered as part of an evidence-based treatment plan under most Medicare plans. Out-of-session family counseling (without the patient present) may have different rules — confirm with your provider.

How long will Medicare cover my stay?

Coverage follows medical necessity, not a fixed day limit (per MHPAEA). Initial authorization is typically 7–14 days of inpatient; extensions are based on clinical review. Most 30-day programs are approved in 2–3 rounds of concurrent review.

Does Medicare cover rehab for seniors?

Yes. Original Medicare (Parts A + B) covers detox, inpatient rehab, outpatient treatment (IOP/PHP added in 2024), and MAT medications (Part D). Medicare Advantage plans typically offer equivalent or better coverage with additional behavioral benefits. There are no annual or lifetime limits on medically necessary SUD treatment under Medicare.

Will Medicare cover methadone for opioid use disorder?

Yes, since 2020. Medicare now covers methadone treatment for OUD at Medicare-certified Opioid Treatment Programs under Part B (not Part D). Daily dosing at the OTP, counseling, and medical oversight are all included. No copay in most cases once the Part B deductible is met.

How do Medicare benefit periods work for inpatient rehab?

A benefit period starts the day you're admitted to inpatient care and ends 60 days after you leave. Within a benefit period, you pay the $1,632 deductible once; days 1-60 are fully covered, days 61-90 have $408/day coinsurance, and days 91+ use lifetime reserve days ($816/day, 60 lifetime total). If you have a new SUD episode after 60 days out of inpatient care, a new benefit period starts.

Should I use Original Medicare or a Medicare Advantage plan for rehab?

Depends. Original Medicare has no annual out-of-pocket cap, which means you're on the hook for 20% coinsurance indefinitely — expensive for long rehab stays unless you have a Medigap supplement. Medicare Advantage caps out-of-pocket at $4,900-$8,850 annually (2026) but requires prior authorization and in-network care. For long or complex SUD treatment, Medigap-paired Original Medicare often costs less overall.

Coverage details reflect typical Medicare plans; your specific employer group or marketplace plan may vary. Always verify with Medicare member services at 1-800-MEDICARE. Last updated April 2026. Sources: MHPAEA (CMS), KFF Health Tracking, SAMHSA, Medicare member resources. See our editorial policy.