Yes. Medicaid pays for some addiction treatment in every state, and it must cover medications for opioid use disorder. Beyond that, what’s covered and which programs get paid depend on your state and on the specific Medicaid plan on your loved one’s card. Residential rehab is where families most often run into limits.
What addiction treatment does Medicaid cover?
Most coverage is decided state by state.1 The opioid medication requirement in the first row below is the exception, and a 2024 federal law made it permanent.3
| Service | What to expect from Medicaid |
|---|---|
| Medications for opioid use disorder | Required by federal law2 |
| Outpatient counseling, intensive outpatient, partial hospitalization, detox | Varies by state and plan1 |
| Residential rehab | Limited by a federal rule; states can pay through a waiver (below)45 |
| Medications for alcohol use disorder | Varies; ask the plan |
Does Medicaid pay for residential rehab?
It depends on the state and the size of the facility. Federal law generally bars Medicaid from paying for care for people under 65 who live in an “institution for mental diseases” (IMD), meaning a hospital, nursing facility or other institution with more than 16 beds that mainly treats mental illness. A narrow exception covers some psychiatric hospital care for people under 21.4 Many larger residential addiction programs count as IMDs.5
States can get around this with a Section 1115 waiver for substance use disorder treatment. With one, Medicaid can help pay for treatment (not room and board) in larger residential programs. The state must use an evidence-based placement tool such as the ASAM Criteria to decide who needs residential care, require residential programs to offer medication for addiction or help patients get it, and aim for a statewide average stay of 30 days. The 30 days is a statewide average; it doesn’t limit your loved one’s own stay.5
Ask the plan whether your state has this waiver and which residential programs it pays for. If it doesn’t, ask the assessor whether a less intensive level could work. See how an assessment sets the level of care and who residential treatment is really for.
Who qualifies for Medicaid?
Eligibility turns on income, household size, disability, pregnancy, family status and your state’s rules.6 In states that expanded Medicaid, adults can qualify on income alone, up to about 138% of the federal poverty level (a few states use a different limit). In states that didn’t, some low-income adults fall into a gap where they qualify for neither Medicaid nor Marketplace savings.6
You can apply any time of year, through HealthCare.gov or your state Medicaid agency. Apply even if income looks too high; states have other routes for people who are pregnant, disabled or caring for children.7 Also worth knowing:
- Medicaid may pay for care from up to 3 months before the application, depending on income and medical expenses at the time.7 For applications on or after January 1, 2027, expansion adults get at most one month back.14
- Former foster youth may be able to keep Medicaid until age 26.7
- A recent law change narrowed which immigration statuses qualify for full Medicaid.7
If Medicaid isn’t an option, compare other ways to pay for treatment.
Why does the Medicaid plan name matter?
Some state Medicaid programs provide coverage through private insurance companies.7 A program that says “we take Medicaid” may contract with one of those companies and not another, so the plan named on the card is the one that counts.
Medicaid managed care plans and CHIP must follow federal parity rules: limits on addiction care can’t be stricter than limits on medical care.8 If the plan denies or cuts short care, get the reason and the appeal deadline in writing, then read how to appeal a denial.
What are the new Medicaid work requirements?
Starting January 1, 2027, or earlier if a state chooses, many adults on Medicaid will have to show 80 hours a month of work, school, community service or a work program, or enough earnings, to get or keep coverage. The rule applies to non-pregnant adults ages 19 to 64, not on Medicare, who qualify through the expansion group or similar state programs.9
People taking part in a drug or alcohol treatment or rehabilitation program are exempt. So are people the state considers medically frail (ask how it decides), parents and caregivers of a child 13 or younger or of a person with a disability, and people who are pregnant or postpartum. States may also allow short-term hardship exceptions, such as during inpatient care.9
If the state can’t confirm that your loved one meets the requirement or is exempt, it must send a notice and allow 30 days to respond. Missing it can mean losing coverage, though people can reapply.9 Send notices to an address someone checks, and ask the program to help document participation.
How do we find a program that takes Medicaid?
Call member services on the card and ask for in-network programs at the level of care your loved one needs. FindTreatment.gov, SAMHSA’s locator of state-licensed providers, is a good second search.10 The free SAMHSA National Helpline, 1-800-662-4357, can often refer callers to facilities that accept Medicaid.11
Because Medicaid differs from state to state,7 a program in another state may not be able to bill your loved one’s plan. Be wary of anyone offering free travel to an out-of-state program, and read about paid recruiting and treatment fraud.
Questions to ask about Medicaid coverage
- Ask the Medicaid plan
- Ask the program
- If the work requirement applies
Frequently asked questions
My loved one has both Medicare and Medicaid. Which pays?
For opioid use disorder treatment, people with both pay nothing for services they get through their state Medicaid program.12 Show both cards at every visit and ask each program whether it bills both. See how Medicare covers addiction treatment.
Can Medicaid help when someone is leaving jail or prison?
It can. Since 2023, CMS has invited states to apply for reentry waivers that cover certain services, including substance use treatment, for up to 90 days before release.13 Ask reentry staff what your state offers.
Sources
- SAMHSA — Mental Health Treatment: What Does Health Insurance Cover? samhsa.gov/find-support/how-to-pay-for-treatment/know-what-your-insura… — accessed Oct 2026
- CMS — State Health Official Letter #20-005: Mandatory Medicaid State Plan Coverage of Medication-Assisted Treatment (Dec 30, 2020). medicaid.gov/federal-policy-guidance/downloads/sho20005.pdf — accessed Oct 2026
- CMS — State Medicaid Director Letter #24-004: Extension of Medicaid Coverage of Substance Use Disorder Treatment in the Consolidated Appropriations Act, 2024 (November 19, 2024). medicaid.gov/federal-policy-guidance/downloads/smd24004.pdf — accessed Oct 2026
- CMS — State Medicaid Director Letter #18-011: Opportunities to Design Innovative Service Delivery Systems for Adults with a Serious Mental Illness or Children with a Serious Emotional Disturbance (2018), IMD definition and exclusion. medicaid.gov/federal-policy-guidance/downloads/smd18011.pdf — accessed Oct 2026
- CMS — State Medicaid Director Letter #17-003: Strategies to Address the Opioid Epidemic (2017). medicaid.gov/federal-policy-guidance/downloads/smd17003.pdf — accessed Oct 2026
- HealthCare.gov — Medicaid expansion & what it means for you. healthcare.gov/medicaid-chip/medicaid-expansion-and-you/ — accessed Oct 2026
- HealthCare.gov — Medicaid & CHIP coverage. healthcare.gov/medicaid-chip/ — accessed Oct 2026
- Centers for Medicare & Medicaid Services — The Mental Health Parity and Addiction Equity Act (MHPAEA). cms.gov/marketplace/private-health-insurance/mental-health-parity-addi… — accessed Oct 2026
- Centers for Medicare & Medicaid Services — Medicaid Community Engagement Requirement for Certain Individuals Interim Final Rule with Comment Period (CMS-2454-IFC), fact sheet (June 1, 2026). cms.gov/newsroom/fact-sheets/medicaid-community-engagement-requirement… — accessed Oct 2026
- SAMHSA — Find Substance Use Disorder Treatment. samhsa.gov/substance-use/treatment/find-treatment — accessed Oct 2026
- SAMHSA — National Helpline. samhsa.gov/find-help/helplines/national-helpline — accessed Oct 2026
- Medicare.gov — Opioid Use Disorder Treatment Services. medicare.gov/coverage/opioid-use-disorder-treatment-services — accessed Oct 2026
- CMS — HHS Releases New Guidance to Encourage States to Apply for New Medicaid Reentry Section 1115 Demonstration Opportunity (April 17, 2023). cms.gov/newsroom/press-releases/hhs-releases-new-guidance-encourage-st… — accessed Oct 2026
- Centers for Medicare & Medicaid Services — State Medicaid Director Letter SMD #26-001, Implementation of "Eligibility Redeterminations," Section 71107 (March 6, 2026), footnote on retroactive eligibility (section 71112). medicaid.gov/federal-policy-guidance/downloads/smd26001.pdf — accessed Oct 2026