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?

Yes, when medically necessary. Under federal parity law, Medicare must cover residential substance-use treatment on terms comparable to hospital-based medical-surgical stays. Typical first-level authorization covers 5–7 days; extensions approved via concurrent review when clinical progression is documented.

Does Medicare cover medication-assisted treatment (MAT)?

Medicare buprenorphine-naloxone on most Part D formularies; Part B covers MAT medications and administration. MAT is the current standard of care for opioid use disorder per SAMHSA, NIDA, and ASAM.

What do I do if Medicare denies coverage?

File an internal appeal within 120 days of the denial date. For admissions in progress, request expedited review — 72-hour response required by federal rule. If internal appeals are exhausted, escalate to external review through the state insurance department or an Independent Review Organization (decided within 45 days). Most accredited treatment centers accepting Medicare have utilization-review staff who will file the first-level appeal on the patient's behalf.

Can I use Medicare for out-of-state treatment?

Depends on your plan product. PPO plans generally cover out-of-state facilities at in-network rates where a network-sharing agreement exists (common for Medicare); HMO plans typically restrict to in-network providers within the plan service area except for emergencies. Verify product type and network-sharing rules before admission.

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.

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