Does Medicare Cover Rehab?

Medicare operates as Original Medicare has no network; Medicare Advantage has narrower networks, with 65+ million covered across nationwide; uniform Original Medicare rules, county-level Medicare Advantage variation. Its parity compliance framework is enforced under MHPAEA; specific medical-necessity criteria must — under the 2024 Final Rule — be disclosed to plan participants upon request. The paragraphs that follow disaggregate the practical coverage framework.

Parity enforcement — what the 2024 rule changed

Under the 2024 MHPAEA Final Rule, Medicare must prospectively document — via a written comparative analysis, using actual claims data — that non-quantitative treatment limits (prior authorization, medical-necessity criteria, network adequacy, step-therapy requirements) operate no more stringently for behavioral-health care than for medical-surgical care. 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. Disclosure of this analysis to plan participants, the Department of Labor, and (in litigation contexts) plaintiffs is now mandatory within 10 business days of request.

Medicare plan types

Medicare's products (Original Medicare (Parts A+B), Medicare Advantage (Part C), Part D pharmacy, Medigap Supplement, Dual-Eligible) carry variable benefit designs within a common regulatory framework. For addiction-treatment planning, the operative variables are: (1) deductible status at time of admission; (2) in-network versus out-of-network cost-share; (3) prior-authorization requirements; (4) medical-necessity criteria applied. All four should be documented in writing from Medicare member services before admission.

A note on medication-assisted treatment

Federal guidance — SAMHSA TIP 63, NIDA Research Reports, ASAM Criteria 4e — designates MAT with buprenorphine, methadone, or naltrexone as first-line treatment for opioid use disorder. Medicare's current MAT coverage: buprenorphine-naloxone on most Part D formularies; Part B covers MAT medications and administration. Departures from consensus MAT standards in a plan's medical-necessity criteria are actionable under the 2024 parity rule's clinical-alignment requirement.

When Medicare denies — appeal playbook

Appeal strategy for Medicare denials should focus on three documents: (1) the specific medical-necessity criteria applied in the denial (disclosable under 2024 parity rule on request within 10 business days); (2) the comparative analysis Medicare produced demonstrating parity compliance for the non-quantitative treatment limit in question; (3) an ASAM 4e-aligned clinical assessment from an independent treating clinician. Appeals that cite specific criteria against specific clinical documentation have substantially higher reversal rates than appeals that argue clinical judgment in general terms.

Before admission

Pre-admission operational checklist for Medicare: (1) obtain current Summary of Benefits and Coverage from member services (1-800-MEDICARE (1-800-633-4227)); (2) obtain written medical-necessity criteria for the proposed level of care (disclosable under 2024 parity rule); (3) obtain written Verification of Benefits from the proposed facility's utilization-review team; (4) confirm in-network status for the specific Medicare product; (5) confirm prior-authorization status and turnaround. Proceeding without these five documents creates material risk of post-admission benefit dispute.