Does Medical Insurance Cover Rehab? Private, Medicare, Medicaid

Most medical insurance in the United States does cover rehab, both for substance use disorders and for physical rehabilitation after an injury, surgery, or stroke. Federal law requires nearly all plans to treat addiction as a medical condition and cover its treatment on par with other illnesses. What varies is which settings are included, how much you pay out of pocket, and whether you need approval in advance. The details depend on whether you have a Marketplace or employer plan, Medicare, Medicaid, or military coverage.

The Federal Floor Under Private Coverage

Two laws set the baseline. The Affordable Care Act classifies substance use disorder treatment as one of ten essential health benefits that Marketplace plans must cover, with no annual or lifetime dollar caps and no exclusions for pre-existing substance use conditions.¹²

The Mental Health Parity and Addiction Equity Act of 2008 then requires that if a plan covers mental health or substance use treatment, it must do so on terms no more restrictive than those applied to medical and surgical care. That covers copays, deductibles, visit limits, prior authorization, and network standards. If a plan allows 30 inpatient days for a medical condition without prior approval, it generally cannot require prior approval for 30 inpatient days of addiction treatment.³⁴

Private and Employer Plans

Under those rules, most private and employer-sponsored plans cover outpatient counseling, intensive outpatient programs, partial hospitalization, inpatient detoxification, and residential treatment. Coverage usually hinges on a medical necessity determination, with the treating clinician’s documentation reviewed against evidence-based standards such as the American Society of Addiction Medicine (ASAM) criteria. Insurers look at withdrawal risk, co-occurring medical or psychiatric conditions, prior treatment, and relapse potential before authorizing a given level of care.⁵

Self-funded employer plans, where the employer pays claims directly, fall under the federal Employee Retirement Income Security Act rather than state insurance law. Parity still applies if the plan covers both medical and mental health benefits and the employer has more than 50 workers. Employees facing denials under these plans can contact the Department of Labor’s Employee Benefits Security Administration at 1-866-444-3272.⁶

What You’ll Pay

Even with coverage, you’ll usually owe a deductible first, then copays or coinsurance for each service, up to an annual out-of-pocket maximum. Those figures vary by plan, which is why verifying benefits before admission matters.

For reference, uninsured prices run roughly $250 to $800 per day for medical detox, or $1,500 to $5,600 for a typical five- to seven-day stay. A 30-day inpatient or residential program costs $5,000 to $20,000 on average, with luxury facilities exceeding $60,000 for longer stays. Thirty days of outpatient treatment typically runs $1,000 to $10,000, and intensive outpatient programs $3,000 to $11,000.⁷⁸

Prior Authorization

Most insurers require prior authorization before covering inpatient detox, residential programs, partial hospitalization, and intensive outpatient care. The provider submits documentation showing medical necessity. Standard reviews can take up to 30 days; urgent requests must be decided within 72 hours.⁹ After an initial approval, insurers often require continued stay reviews to justify extending treatment.

Medicare

Medicare covers substance use disorder treatment with one significant gap: it does not pay for residential rehab (ASAM Level 3 care).¹⁰

Part A covers inpatient hospital stays for detoxification and psychiatric stabilization. In 2026, the Part A deductible is $1,736 per benefit period, with no daily coinsurance for the first 60 days, $434 per day for days 61 through 90, and $868 per day for lifetime reserve days.¹¹ A lifetime cap of 190 days applies if care is delivered in a freestanding psychiatric hospital rather than a general hospital.¹²

Part B covers outpatient services: individual and group counseling, intensive outpatient programs, partial hospitalization, psychiatric evaluation, medication management, and annual alcohol misuse screenings at no cost. Opioid use disorder treatment through an enrolled opioid treatment program is also covered without cost-sharing. For most other Part B services, beneficiaries pay 20 percent of the Medicare-approved amount after the annual deductible. Part D covers outpatient prescription medications used in substance use treatment.¹²¹³

Medicaid

Medicaid is administered state by state, so rehab coverage varies with where you live. Every state’s program covers at least some substance use treatment, and medication-assisted treatment with methadone, buprenorphine, and naltrexone is now permanently required as a state plan benefit.¹⁴

Residential treatment has long been limited by the “IMD exclusion,” a federal rule barring Medicaid payment to facilities with more than 16 beds classified as Institutions for Mental Diseases. States work around it in two ways. The first is a Section 1115 waiver; as of January 2025, 36 states and the District of Columbia have approved waivers covering residential treatment in IMD facilities.¹⁵ The second is a state plan option created by the SUPPORT Act, which allowed up to 30 days of IMD-based treatment per year from October 2019 through September 2023 if the facility offered at least two forms of medication-assisted treatment on site.¹⁶ The practical takeaway: call your state Medicaid agency about residential coverage, because the answer isn’t national.

Veterans and Military Service Members

TRICARE covers substance use disorder treatment that is medically necessary, including inpatient care, intensive outpatient programs, detoxification, medication-assisted treatment, opioid treatment programs, partial hospitalization, and mental health therapy.¹⁷

The VA separately covers detoxification, inpatient and outpatient care, aftercare, and counseling for enrolled veterans. Treatment can be delivered at VA facilities or through the VA’s community care program, and VA benefits can be used alongside private insurance or Medicare. Family members not eligible for TRICARE may qualify for coverage through CHAMPVA.¹⁸

If You Mean Physical Rehab

The rules shift for rehabilitation after an injury, surgery, or stroke. Medicare Part A covers inpatient rehabilitation in a certified rehab facility or hospital unit when a doctor certifies the patient needs intensive therapy, continued medical supervision, and coordinated care from a team. Covered services include physical, occupational, and speech-language therapy, nursing, meals, and prescription drugs during the stay.¹¹

In 2026, the cost structure matches any Part A inpatient stay: a $1,736 deductible per benefit period, nothing per day for days 1 through 60, $434 per day for days 61 through 90, and $868 per day for lifetime reserve days. A patient transferred directly from an acute care hospital to a rehab facility, or admitted within 60 days of discharge, pays no new deductible within the same benefit period.¹¹

Rehabilitative and habilitative services are also essential health benefits under the ACA, so Marketplace plans must include them, though states have latitude in defining the exact scope. Medicaid coverage for inpatient rehab facilities ranges from full coverage to pre-approval requirements depending on the state.¹⁹

How to Verify Your Coverage Before You Go

Call the member services number on your insurance card with your member ID, group number, and the policyholder’s information in hand. Ask:

Does the plan cover the specific type of treatment you need: detox, inpatient, residential, outpatient, or intensive outpatient?
What is the deductible, how much has been met, and what copay or coinsurance applies?
Is prior authorization required, and who submits the request?
Is the facility in-network? Out-of-network care typically costs substantially more.
Are there caps on covered days or visits?

Record the representative’s name, the date, and a reference number. Most treatment centers will also run this check at no charge during admissions and can submit clinical assessments to the insurer to support prior authorization.²⁰

If Your Claim Is Denied

You have the right to appeal, and the odds are better than many people assume. The ACA sets a two-stage process.²¹

First, file an internal appeal with the insurer within 180 days of the denial. The insurer must respond within 30 days for services not yet received, 60 days for services already provided, and 72 hours for urgent situations. Before the formal appeal, the treating physician can often request a peer-to-peer conversation with the insurer’s medical director, which sometimes resolves the issue informally.²²

If the internal appeal fails, request an external review by an independent third party, usually within 60 days of the final internal denial. That decision is binding on the insurer, and expedited external reviews for urgent cases must be decided within four business days.²¹²²⁹

At any point, you can also file a complaint with your state insurance commissioner. For ERISA-governed employer plans, the Department of Labor’s EBSA offers free help through its benefits advisors at 1-866-444-3272.⁶

If You Don’t Have Insurance

Treatment is still reachable. SAMHSA’s National Helpline (1-800-662-4357) is a free, confidential, 24/7 referral service that connects callers with local programs, including those that accept uninsured patients. The agency’s FindTreatment.gov site is a searchable directory of facilities nationwide.²³²⁴

State-funded programs are often the least expensive route, and some provide treatment at no cost. Many facilities offer sliding-scale fees based on income or payment plans. You may also qualify for Medicaid, especially in the 40 states that expanded eligibility under the ACA; SAMHSA offers a search tool for state-specific Medicaid and CHIP information.²³

1
HealthCare.gov. Mental Health and Substance Abuse Coverage
2
ASPE. Affordable Care Act Expands Mental Health and Substance Use Disorder Benefits and Federal Parity Protections
3
U.S. Department of Labor. Mental Health and Substance Use Disorder Parity
4
The Commonwealth Fund. Enforcing Mental Health Parity: State Options to Improve Access to Care
5
PMC. The Affordable Care Act and Substance Use Disorder Treatment
6
U.S. Department of Labor. Understanding Your Mental Health and Substance Use Disorder Benefits
7
Drug Abuse Statistics. Cost of Rehab
8
Rehabs.com. How Can I Go to Rehab Without Insurance
9
Harvard Health. Prior Authorization: What Is It, When Might You Need It, and How Do You Get It
10
ASAM. Medicare Physician Fee Schedule Blog Post
11
Medicare.gov. Inpatient Rehabilitation Care
12
Center for Medicare Advocacy. Medicare Coverage of Mental Health Services
13
Medicare.gov. Mental Health and Substance Use Disorder
14
Medicaid.gov. Substance Use Disorders
15
PMC. Section 1115 Medicaid SUD Waivers Study
16
Medicaid.gov. SUPPORT Act State Plan Option Guidance
17
TRICARE. Substance Use Disorder Treatment
18
American Addiction Centers. VA Benefits for Addiction Treatment
19
PMC. Post-Stroke Rehabilitation and Insurance Coverage
20
Nova Recovery Center. How Do I Verify My Insurance Benefits Before Entering Drug Rehab
21
CMS. Appeals Process Fact Sheet
22
Partnership to End Addiction. How to File an Insurance Appeal for Substance Use Disorder
23
SAMHSA. Find Support If You Don’t Have Insurance
24
FindTreatment.gov. FindTreatment.gov