Rehab with insurance typically costs between $0 and $500 per month for outpatient programs, while residential (inpatient) treatment can run $1,000 to $10,000 or more out of pocket even with coverage. The exact number depends on your plan type, whether the facility is in-network, what level of care you need, and how much of your deductible you’ve already met. Federal law requires most insurance plans to cover substance use treatment, but “covered” and “free” are very different things.
What Insurance Is Required to Cover
The Affordable Care Act lists substance use disorder services as one of ten essential health benefit categories. That means all non-grandfathered individual and small group plans sold through the marketplace must include addiction treatment coverage. Employer-sponsored plans with more than 50 employees are also required to comply.
On top of that, the Mental Health Parity and Addiction Equity Act prevents insurers from making substance use treatment harder to access than comparable medical care. Copays, coinsurance, and visit limits for rehab cannot be more restrictive than those applied to medical and surgical benefits. Under 2024 final rules, this also extends to things like prior authorization requirements and how insurers build their provider networks. In plain terms: your insurer can’t approve 60 days of physical rehab after surgery but cap addiction treatment at 14 days if both fall in the same benefit classification.
These laws mean your plan almost certainly covers some form of rehab. The question is how much of the bill lands on you.
The Costs You’ll Actually Pay
Your out-of-pocket costs for rehab break down into the same components as any medical expense: your deductible, copays or coinsurance, and any balance beyond what your plan covers.
If you haven’t met your annual deductible, you’ll pay 100% of rehab costs until you do. For marketplace plans, deductibles range from a few hundred dollars on Gold and Platinum plans to $5,000 or more on Bronze plans. After your deductible, most plans cover 60% to 90% of the cost, leaving you responsible for the rest as coinsurance. A 30-day residential stay billed at $30,000, for example, could leave you owing $3,000 to $12,000 depending on your coinsurance rate and how much deductible remains.
The good news: federal law caps what you can spend in a year. For the 2026 plan year, the out-of-pocket maximum for a marketplace plan is $10,600 for an individual and $21,200 for a family. Once you hit that ceiling, your plan pays 100% of covered services for the rest of the year. For expensive residential programs, this cap is often the number that matters most.
Outpatient vs. Residential: How Cost Differs
Outpatient rehab is significantly cheaper, and insurance covers a larger share of it. Standard outpatient programs involving a few sessions per week may cost you only a copay per visit, often $20 to $75. Intensive outpatient programs (IOPs), which involve 9 to 20 hours of treatment per week, typically run $5,000 to $15,000 total before insurance. With decent coverage, your share might be $500 to $3,000.
Residential treatment is where costs climb. A 30-day inpatient stay commonly costs $20,000 to $60,000 at a standard facility, and luxury programs charge well beyond that. Insurance will cover a portion, but prior authorization is almost always required, and your plan may only approve a certain number of days. If the clinical team recommends 90 days but your insurer authorizes 30, you’ll need to appeal or pay the difference yourself.
Partial hospitalization programs (PHPs) fall in between. You attend treatment during the day but go home at night, and total costs before insurance typically range from $10,000 to $20,000 per month. Many plans treat PHPs more favorably than full residential stays because they’re less expensive for the insurer.
In-Network vs. Out-of-Network Facilities
Choosing an in-network facility is the single biggest thing you can do to lower your costs. In-network providers have negotiated rates with your insurer, which means lower bills and higher coverage percentages. Out-of-network facilities charge their own rates, and your plan pays based on what it considers the “allowed amount,” not what the provider actually bills. You’re responsible for the gap.
For example, if an out-of-network facility charges $1,200 per day but your insurer’s allowed amount is $800, you owe the $400 difference on top of your coinsurance. This “balance billing” can add thousands to a 30-day stay. Some states have surprise billing protections that limit this practice, but they don’t always apply to rehab facilities you choose voluntarily.
If no in-network providers are available near you or can see you within a reasonable timeframe, your insurer may be required to approve an out-of-network referral at in-network cost-sharing rates. This varies by state, but it’s worth requesting if you’re struggling to find an in-network facility with openings.
Coverage by Insurance Type
Employer-Sponsored Plans
These tend to offer the most comprehensive rehab coverage, particularly at large companies. PPO plans give you flexibility to go out-of-network at a higher cost, while HMO plans keep costs lower but restrict you to in-network providers. Many employer plans cover 30 days of residential treatment with prior authorization, though some limit coverage to outpatient care unless medical necessity is demonstrated.
Marketplace (ACA) Plans
All marketplace plans must cover substance use treatment, but the level of cost-sharing varies dramatically by metal tier. A Platinum plan might cover 90% after a small deductible, while a Bronze plan might cover 60% after a $7,000 deductible. If you anticipate needing residential treatment, a higher-tier plan purchased during open enrollment can save you thousands.
Medicaid
Medicaid covers substance use treatment in every state, often with little to no out-of-pocket cost. All state Medicaid programs are now required to cover medication-assisted treatment for opioid use disorders. Many states also cover residential stays, detox, outpatient counseling, and intensive outpatient programs through their state plans or managed care waivers. The specific services available vary by state, but Medicaid generally provides the lowest cost path to rehab for those who qualify.
Medicare
Medicare Part A covers inpatient rehab stays, and Part B covers outpatient treatment and counseling. You’ll pay the standard Part B coinsurance of 20% for outpatient visits after your deductible. Inpatient stays are subject to the Part A deductible, which resets per benefit period.
Medication-Assisted Treatment Costs
If your treatment plan includes medications for opioid or alcohol use disorders, these carry their own costs. The medications themselves are covered under most plans, but you’ll pay a copay that depends on your plan’s prescription drug tier. Generic versions of common treatment medications often fall on lower tiers with copays of $10 to $50 per month.
Research on Medicaid populations has found that medication-based treatment actually lowers total healthcare spending compared to behavioral treatment alone, with savings of $153 to $223 per month. This is one reason insurers generally cover these medications without excessive barriers. However, costs can be higher for people with co-occurring mental health conditions or multiple substance use disorders, with average treatment costs running $786 more per month in those cases.
How to Reduce Your Out-of-Pocket Costs
Start by calling the number on the back of your insurance card and asking specifically what substance use treatment benefits your plan includes. Ask about covered levels of care (detox, residential, PHP, IOP, outpatient), how many days or sessions are authorized, and which facilities are in-network near you. Get this in writing if possible.
Request prior authorization before entering treatment. Showing up at a facility without approval can result in your insurer denying the claim entirely, leaving you with the full bill. If your insurer denies coverage or limits the number of approved days, you have the right to appeal. Parity law is on your side here: if your plan wouldn’t impose the same restriction on a comparable medical condition, the limitation may be illegal.
Many rehab facilities also have financial counselors who will verify your insurance benefits and estimate your costs before admission. Some offer sliding-scale fees or payment plans for the portion insurance doesn’t cover. It’s worth asking, especially at nonprofit treatment centers that receive public funding to offset costs for underinsured patients.