Does Medicare Cover Rehab?

Medicare is one of those names every family navigating treatment learns the details of eventually. Deductibles from Part A: $1,632/benefit period · Part B: $240/year. Coinsurance in the Part A: $0 days 1–60 then daily coinsurance · Part B: 20% after deductible range. 65+ million covered. The interesting part is not the numbers, though — it is the behavior, which is what a half-decade of parity litigation has put on record for each of the major carriers.

Parity enforcement — what the 2024 rule changed

Parity in addiction coverage was nominal for most of the last decade. The 2024 rule made it operational. 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. That does not mean every denial gets overturned; it means the ones that should get overturned are now easier to argue for.

Medicare plan types

The plan-type question matters because Medicare's products — Original Medicare (Parts A+B), Medicare Advantage (Part C), Part D pharmacy, Medigap Supplement, Dual-Eligible — are not interchangeable for addiction-treatment access. HMO means gatekeeper. PPO means out-of-network flexibility. Medicare Advantage means CMS rules. The first useful move is identifying which of these is on your card.

A note on medication-assisted treatment

On MAT specifically — because this is where the marketing language and the clinical reality most often diverge — 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. Plans that make it hard to access are increasingly out of step with both the evidence and the parity rule.

When Medicare denies — appeal playbook

What most families do not know about Medicare denials: the clock is on your side if you know it. 120 days to file. 72 hours for expedited. External review available after internal exhaustion. The plans that deny casually in the first round are the ones whose denial rates cluster around a 35-40% reversal on appeal — a number that should give any patient a reason to appeal rather than accept.

Before admission

Before admission, do three things Medicare members routinely skip: get the verification of benefits in writing, get the medical-necessity criteria in writing, get the in-network status confirmed in writing. The 20 minutes it takes saves the $5,000-to-$15,000 surprise bill that arrives three months later.