Usually, at least in part. Marketplace plans must cover addiction treatment, Medicaid and Medicare cover it, and most employer plans that include it must follow federal parity rules. What a family ends up paying is another matter. That depends on network status, the deductible and coinsurance, and how many days the plan approves.
Many families find out what “covered” meant only when the bill arrives. A few phone calls before anyone signs a financial agreement can prevent that, and our 10 questions to ask your plan tell you what to say.
Which insurance page answers our question?
Each page below takes one money question and answers it in full. They’re listed in the order most families need them.
Insurance & Costs, in reading order
TRICARE and VA benefits have their own rules; see treatment for veterans and military families.
Does insurance have to cover addiction treatment?
It depends on the kind of coverage, but most families have some.
| Coverage | Does it cover addiction treatment? |
|---|---|
| Marketplace plans | Yes. It’s an essential health benefit, with no yearly or lifetime dollar limits and no denial for a pre-existing substance use condition.1 |
| Employer plans | Usually. Small-employer plans bought from an insurer must include it unless the plan is “grandfathered.” Federal parity law doesn’t force a larger group plan to offer addiction benefits, but if it does, they generally can’t be more restricted than medical benefits.23 |
| Medicaid | Yes, though services vary by state.124 |
| Medicare | Yes, for many services, including intensive outpatient programs.6 |
What does the parity law do for you?
The Mental Health Parity and Addiction Equity Act covers individual plans and plans from employers with more than 50 workers, when they offer substance use benefits. Small-employer plans get similar protection through the Affordable Care Act.2 For that care, copays, deductibles, visit caps and prior-authorization rules generally can’t be stricter than for medical and surgical care.23 Parity doesn’t make a plan pay for whatever a program recommends, though. The plan still applies its own medical-necessity criteria.
In May 2025, federal agencies paused enforcement of the newer parts of a 2024 parity rule while they reconsider it. The 2008 law and the earlier rules still apply.7 Our page on appeals and parity complaints explains how to use them.
The terms that decide your bill
A clinician decides what level of care your loved one needs. The plan decides what it will pay for, where, for how long and on what terms. These words describe the plan’s side.
| Term | What it means for you |
|---|---|
| Deductible | What you pay each plan year before the plan starts sharing costs |
| Copay | A fixed amount per visit or day |
| Coinsurance | Your percentage of the cost after the deductible, such as 20% |
| Out-of-pocket maximum | The most you pay in a year for covered, in-network care |
| In network | The program has a contract with your plan. Usually cheaper for you |
| Out of network | No contract. Higher cost, and the program may bill you the difference |
| Prior authorization | Approval the plan requires before some care starts. For a residential stay, it may approve a few days at a time |
| Medical necessity | The plan’s decision that a service is clinically needed, using its own criteria |
| Verification of benefits | A summary of what the plan says it covers. Information, not a promise to pay |
The rest are in our glossary.
Is there a limit on what we’ll pay in a year?
For covered in-network care, yes. In 2026 a Marketplace plan’s out-of-pocket limit can be no more than $10,600 for one person or $21,200 for a family, rising to $12,000 and $24,000 in 2027.8
The limit leaves out premiums, care the plan doesn’t cover, balance bills above the allowed amount, and anything spent out of network.8 So an out-of-network stay can cost far more than the same stay in network. More on that in why network status matters.
What will we actually owe?
Estimate with your own plan’s numbers. Member services or the plan’s online account can give you the allowed amount (the daily or per-session rate your plan pays, not the program’s list price), how much deductible and out-of-pocket maximum you have left this year, and the coinsurance or copay for that level of care.
Estimate your share of the bill
CalculatorUse the numbers from your plan documents or your call with the insurer. This is a rough estimate, not a quote.
How it works: you pay the remaining deductible, then your coinsurance share, capped at your out-of-pocket maximum. Out of network, many plans have a separate (or no) cap, and the program may bill you for the difference between its charge and what the plan allows (“balance billing”).
The result assumes the plan approves every day of care, which it may not. Our worked cost example walks through the math.
What should we do before admission?
- Get an assessment first, so you know what level of care to ask the plan about.
- Call the number on the insurance card yourself and ask about that program, at that address, for that level of care. A program can be in network for outpatient care at one site and out of network for residential care at another. Write down the date, the representative’s name and a reference number.
- Ask who requests prior authorization and how many days are usually approved at a time.
- Get a written estimate, read the financial agreement, and ask who pays if the plan stops approving days.
- Keep every letter from the plan. You’ll need them if you appeal.
Be wary of a program that says “your insurance covers everything,” offers to waive your deductible, or pays for travel once you hand over your insurance details. These are signs of a program that isn’t legitimate.
Frequently asked questions
Does insurance cover medication for addiction?
Often, yes. State Medicaid programs must cover all FDA-approved medications for opioid use disorder, including methadone, plus related counseling, and a 2024 law made that permanent.124 Medicare Part B covers methadone, buprenorphine and naltrexone at opioid treatment programs, with usually no copayment at an enrolled program, though the Part B deductible applies.5 With a private plan, ask member services how each medication is covered and whether it needs prior authorization.
Can we get a cost estimate in writing?
Ask every program for one. If your loved one is uninsured or paying without insurance, in most cases they can get a good faith estimate before receiving care.9
Our plan covers treatment, but we can't afford our share. What now?
You can apply for Medicaid any time of year.10 The free, confidential SAMHSA Helpline (1-800-662-4357) can refer uninsured or underinsured callers to state-funded treatment and often to sliding-fee programs.11 Our page on getting care when money is the barrier covers each option.
Sources
- HealthCare.gov — Mental health and substance abuse health coverage options. healthcare.gov/coverage/mental-health-substance-abuse-coverage/ — 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 — Fact sheet: The Mental Health Parity and Addiction Equity Act of 2008 (MHPAEA). cms.gov/newsroom/fact-sheets/mental-health-parity-and-addiction-equity… — 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
- Medicare.gov — Opioid Use Disorder Treatment Services. medicare.gov/coverage/opioid-use-disorder-treatment-services — accessed Oct 2026
- Medicare.gov — Mental Health Care (Outpatient): Intensive Outpatient Program Services. medicare.gov/coverage/mental-health-care-outpatient-intensive-outpatie… — accessed Oct 2026
- U.S. Departments of Labor, HHS and the Treasury — Statement regarding enforcement of the final rule on requirements related to the Mental Health Parity and Addiction Equity Act (May 15, 2025). cms.gov/files/document/statement-regarding-enforcement-final-rule-requ… — accessed Oct 2026
- HealthCare.gov — Out-of-pocket maximum/limit (glossary). healthcare.gov/glossary/out-of-pocket-maximum-limit/ — accessed Oct 2026
- Centers for Medicare & Medicaid Services — No Surprises: Understand your rights against surprise medical bills. cms.gov/newsroom/fact-sheets/no-surprises-understand-your-rights-again… — accessed Oct 2026
- HealthCare.gov — Medicaid & CHIP coverage. healthcare.gov/medicaid-chip/ — accessed Oct 2026
- SAMHSA — National Helpline. samhsa.gov/find-help/helplines/national-helpline — 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