Coverage Profile
Does Medicare Cover Rehab?
Yes — under federal parity law. Medicare must cover medically necessary substance-use treatment on terms comparable to medical-surgical care.
At a glance: Typical deductible Part A: $1,632/benefit period · Part B: $240/year, coinsurance Part A: $0 days 1–60 then daily coinsurance · Part B: 20% after deductible. Prior authorization common for residential admissions. Verify via member services before admission.
Medicare coverage at a glance
Parent company
Centers for Medicare & Medicaid Services
Members covered
65+ million
Deductible range
Part A: $1,632/benefit period · Part B: $240/year
Typical copay
Part A: $0 days 1–60 then daily coinsurance · Part B: 20% after deductible
Out-of-pocket max
no cap in Original Medicare; Medicare Advantage capped at $8,850 (2024)
Member services
1-800-MEDICARE (1-800-633-4227)
Behavioral partner
CMS directly, or Medicare Advantage plan behavioral-health partner
State scope
nationwide; uniform Original Medicare rules, county-level Medicare Advantage variation
Appeal window
120 days internal · 72 hrs expedited
Medicare covers addiction treatment — that much is settled under federal parity law. What differs across Medicare's (Centers for Medicare & Medicaid Services) 65+ million-member book of business is the practical friction: deductible, network adequacy, prior-authorization turnaround. Below is a working reference.
Parity enforcement — what the 2024 rule changed
Under the 2024 rule, Medicare must disclose medical-necessity criteria on request and can no longer rely on undisclosed internal thresholds to constrain behavioral-health access. On the empirical side, Medicare has been among the insurers more responsive to documented medical-necessity cases post-2024, though variation by plan product remains meaningful.
Medicare plan types
Coverage varies across Medicare's products: Original Medicare (Parts A+B), Medicare Advantage (Part C), Part D pharmacy, Medigap Supplement, Dual-Eligible. HMO products require PCP gatekeeping; PPO products permit out-of-network at higher cost-share; Medicare Advantage follows CMS rules. Plan-specific benefit verification is the operational prerequisite.
A note on medication-assisted treatment
For medication-assisted treatment: Medicare buprenorphine-naloxone on most Part D formularies; Part B covers MAT medications and administration. MAT for opioid use disorder is the current standard of care per SAMHSA, NIDA, and ASAM — facilities that restrict or refuse MAT are operating outside consensus. Confirm formulary tier for your plan before the first prescription.
When Medicare denies — appeal playbook
The appeal playbook with Medicare: request the specific medical-necessity criteria applied to the denial (disclosable under 2024 parity rule), compare against your clinical documentation, file within the 120-day window. Appeals citing specific criteria have higher reversal rates than general clinical arguments.
Before admission
Before admission on Medicare, three documents are worth collecting in writing: a current Summary of Benefits and Coverage from member services (1-800-MEDICARE (1-800-633-4227)); a written Verification of Benefits from the proposed facility; and the plan's medical-necessity criteria for the requested level of care. Proceeding without all three is the source of most post-admission cost-sharing disputes.
Frequently asked questions about Medicare
Does Medicare cover residential rehab?
Does Medicare cover medication-assisted treatment (MAT)?
What do I do if Medicare denies coverage?
Can I use Medicare for out-of-state treatment?
Coverage details vary by specific plan. Verify with Medicare member services before admission. Last updated April 2026. Sources: MHPAEA 2024 Final Rule, KFF Health Tracking, ASAM Criteria 4e, Medicare member resources. See our editorial policy.
Facility data comes from SAMHSA’s National Directory and state licensing boards. Statistics are cross-referenced against CDC WONDER, NIDA, and peer-reviewed research. Every medical claim is checked against primary sources before publication. Corrections are processed within 48 hours.