Coverage Profile

Does Medicaid Cover Rehab?

Yes — under MHPAEA. Medicaid must cover medically necessary substance use treatment at parity with medical care.

At a glance: Typical deductible $0 (some states have small copays), coinsurance $0–$5 per service. Pre-authorization common for inpatient/residential. Verify via member services.

Medicaid Coverage at a Glance

Parent company

Centers for Medicare & Medicaid Services (CMS) + 50 state Medicaid agencies

Members covered

85+ million

Deductible range

$0 (some states have small copays)

Typical copay

$0–$5 per service

OOP max

Federal Medicaid cost-sharing capped at 5% of family income (statute)

Member services

Call your state Medicaid agency or managed-care plan

Medicaid is the single largest payer for addiction treatment in the United States. The Affordable Care Act's Medicaid expansion extended coverage to low-income adults in (as of 2025) 40 states plus DC; in those states, SUD treatment is covered as an Essential Health Benefit, often with zero or minimal cost-sharing. In non-expansion states, eligibility is typically limited to specific categories (pregnant women, low-income parents, people with disabilities) but SUD services for those who qualify are still covered.

Medicaid Plan Types — What Each Covers

Not all Medicaid plans cover rehab the same way. Coverage depends on plan type from your ID card.

Traditional fee-for-service Medicaid

Direct state-administered coverage; declining share of enrollment nationally.

Medicaid Managed Care (MCO)

State contracts with commercial plans (Centene, Molina, Anthem, UHC) to administer Medicaid benefits. Network rules and prior-auth vary by plan.

1115 SUD Waivers

35+ states have federal waivers allowing expanded residential and IMD (Institutions for Mental Disease) coverage beyond the default Medicaid exclusion.

CHIP (Children's Health Insurance Program)

Separate or Medicaid-combined coverage for low-income children and pregnant women.

Dual-Eligible (Medicaid + Medicare)

For members enrolled in both programs — typically low-income adults over 65 or with disabilities.

Common Medicaid Denial Reasons

Knowing these before admission lets your facility submit stronger first-time authorization.

! Denial based on IMD exclusion in non-waiver states (federal rule prohibiting Medicaid payment to freestanding mental-health/SUD facilities with more than 16 beds for most adult populations) — most states have 1115 waivers that create exceptions.
! Denial of residential when intensive outpatient is available locally.
! Denial of specific MAT medications outside state formulary; most states now cover all three FDA-approved MAT medications.
! Network-adequacy gaps when the Medicaid MCO does not contract with the desired facility.

If Medicaid denies your claim — appeal timeline

Medicaid has a federally mandated fair-hearing process. First-level internal appeal through the state Medicaid agency or MCO within 60 days of denial (varies by state). State fair hearing within 90 days after internal appeal. Emergency treatment cannot be denied, regardless of authorization status.

Frequently Asked Questions About Medicaid

Does Medicaid cover residential SUD treatment?

Yes in most states, especially those with 1115 SUD waivers. The IMD exclusion historically limited this; more than 35 states have received waivers to cover residential SUD care since 2018.

Does Medicaid cover MAT?

Yes. All state Medicaid programs now cover buprenorphine, methadone, and naltrexone for opioid use disorder. Some states cover additional medications for alcohol use disorder.

What if my state did not expand Medicaid?

Eligibility is narrower, but SUD services for qualifying populations (pregnant women, low-income parents, people with disabilities) are still covered. The Marketplace may offer subsidized alternative coverage.

Can I use Medicaid out of state?

Generally no. Medicaid is state-administered; emergency treatment in another state is covered but elective treatment is not, except in specific border-community arrangements.

Coverage details vary per specific plan. Verify with Medicaid member services before admission. Last updated April 2026. Sources: MHPAEA (CMS), KFF Health Tracking, SAMHSA, Medicaid member resources. See our editorial policy.