Medicare Coverage for Addiction Treatment in NJ

Coverage by part

The dollar figures are Medicare’s 2026 amounts. They change every January, so check the current year on Medicare.gov. Medicare Advantage plans set their own copays.

Part A: hospital inpatient

Part A covers inpatient detox and inpatient substance use treatment when it happens in a hospital, including the hospital-based units that anchor New Jersey's detox capacity. You pay the Part A deductible per benefit period, then nothing for the first 60 days. Care in a freestanding psychiatric hospital counts against a 190-day lifetime limit, which does not apply to psychiatric units inside general hospitals. Ask which kind of hospital you are in.

The 60 days are counted per benefit period. If a stay runs longer, days 61 to 90 cost $434 a day in 2026, on top of the $1,736 deductible.

Before you leave a hospital as an inpatient, the hospital must give you a notice called the Important Message from Medicare. It explains your right to appeal the discharge. If you think you are being sent home before withdrawal is under control, read it that day: it gives the phone number of your Quality Improvement Organization, the independent reviewer, and tells you to appeal before you leave the hospital, which keeps your stay covered while you wait for the decision.

Part B: outpatient and day programs

Part B covers outpatient therapy with a physician, psychologist, clinical social worker, or, since 2024, a licensed mental health counselor or marriage and family therapist. It covers partial hospitalization when a physician certifies you would otherwise need inpatient care. Since January 2024 it also covers intensive outpatient programs, which closed a long-standing gap. And since 2020 it covers opioid treatment programs, meaning methadone with its counseling and testing, as a bundled benefit with little or no cost-sharing at the program. Standard Part B cost-sharing is the annual deductible plus 20 percent coinsurance.

The two day programs differ by hours. Medicare describes partial hospitalization as a care plan of at least 20 hours of therapeutic services a week, usually four to eight hours a day, at a hospital outpatient department or community mental health center. Intensive outpatient is for a care plan of at least 9 hours a week, at a hospital, community mental health center, federally qualified health center or rural health clinic, and, for opioid use disorder, at an opioid treatment program. You do not have to qualify for inpatient care to get IOP.

Two practical limits. Medicare covers partial hospitalization only when the program accepts assignment, meaning it takes Medicare’s approved amount as full payment. And it does not pay for meals or for transportation to and from the program, which matters for a five-day-a-week schedule. Our guides to partial hospitalization and intensive outpatient explain what a week in each looks like.

The no-copay rule holds only at an opioid treatment program enrolled in Medicare, and the Part B deductible still applies. Ask whether the program you choose is enrolled in Medicare. Our list of New Jersey methadone clinics is the place to start.

Part D: prescriptions

Part D plans cover buprenorphine and naltrexone. Copays vary by plan tier; generic buprenorphine-naloxone is inexpensive on most formularies. Methadone for addiction is not a Part D benefit because it is dispensed at opioid treatment programs under Part B.

Medicare Advantage

Advantage plans must cover everything Original Medicare covers, but they can use networks, require prior authorization, and set their own copays. Ask whether yours requires prior authorization for PHP and inpatient care. Call the plan, not 1-800-MEDICARE, and ask for behavioral health.

Federal rules limit how an Advantage plan uses prior authorization. Since CMS’s 2024 rule, a plan may use it only to confirm a diagnosis or other medical criteria, or that a service is medically necessary, and it must follow Original Medicare’s coverage rules when it decides. If you switch to a new Advantage plan in the middle of a course of treatment, the new plan must give you at least 90 days in which it cannot require prior authorization for that treatment. Plans generally must decide urgent requests within 72 hours. Since January 1, 2026, they must also decide standard requests for medical services within seven calendar days and give a specific reason when they deny one. Those 2026 rules do not cover requests for drugs.

None of that is New Jersey’s 180-day rule. The state law that bars prior authorization for the first 180 days of addiction treatment covers fully insured New Jersey plans and the State Health Benefits and School Employees’ plans. Medicare and Medicare Advantage are not covered by it, whichever company runs the plan.

The residential gap

Original Medicare does not cover care in a freestanding residential addiction treatment facility, the 30-day program most people picture. It covers the hospital-based version of inpatient care and it covers everything on the outpatient side. For a Medicare beneficiary in New Jersey who needs more than IOP, the practical path is usually hospital-based detox and stabilization, then PHP paired with a recovery residence, then IOP. Medigap policies help pay your share of costs for care Original Medicare covers, so they do not fill this gap. Some Advantage plans may offer more; ask the plan for it in writing. If a residential program tells you Medicare will cover the stay, ask them to show you how in writing before you sign anything.

Dual eligibility

Many New Jersey residents on Medicare also qualify for NJ FamilyCare, which then covers what Medicare does not, including residential treatment, and picks up Medicare's cost-sharing. If your income is limited, apply; our NJ Medicaid guide explains how. Dual-eligible members can call the member services number on their plan card. For help independent of us, the state’s IME Addictions Access Center at 1-844-276-2777 (24/7) screens NJ FamilyCare and uninsured callers and refers them to treatment, and ReachNJ at 1-844-732-2465 is the state’s general treatment line. Periscope Behavioral Health, our publisher’s admissions line, at (888) 313-3583, can also help you find a program. What a plan covers depends on the plan and the facility’s network status.

The order matters. Medicare pays first for what it covers: hospital detox, PHP, IOP and the opioid treatment program. NJ FamilyCare pays after it, and pays for residential care Medicare does not cover. For residential detox and rehab, the IME Addictions Access Center at 1-844-276-2777 screens callers and refers them to treatment, 24/7, and authorizes residential detox and rehab for most NJ FamilyCare members.

Older adults and alcohol

The typical Medicare beneficiary seeking treatment in New Jersey is not a young person with an opioid problem. It is someone in their sixties or seventies whose drinking escalated after retirement, a loss, or a move, and whose withdrawal is more dangerous than a younger person's because of the medications they take and the conditions they carry. Hospital-based detox is the right setting, and Part A covers it. Our alcohol detox guide explains why outpatient detox is often the wrong choice at this age.

The call

For Original Medicare, the questions are about the facility: is it Medicare-certified, is it a hospital or a freestanding program, and for outpatient care, does the provider accept Medicare assignment. For Advantage plans, call the plan and ask about behavioral health coverage at each level, prior authorization, and network status. Write down who you spoke to.

1. Is this program enrolled in Medicare, and does it accept assignment?
2. Is it a hospital, a hospital outpatient department, a community mental health center or a freestanding program?
3. For partial hospitalization: has a physician certified that I would otherwise need inpatient care?
4. What will I pay per program day after the Part B deductible?
5. For an Advantage plan: is the program in network, does this level of care need prior authorization, and how fast will you decide?
6. If I also have NJ FamilyCare, will you bill it for what Medicare does not pay?

How to search for a program that takes Medicare

SAMHSA’s FindTreatment.gov lets you filter by what programs report. Enter your town, then choose “Medicare” under payment accepted. Add the service setting you need, such as “Hospital inpatient detoxification,” “Intensive outpatient treatment” or “Outpatient day treatment or partial hospitalization,” and, if it helps, “Seniors or older adults” under special programs. The listings are self-reported, so confirm by phone.

Where to go

Hospital systems with detox units and outpatient behavioral health departments serve Medicare patients throughout the state; our location guides name them by region. The Hammonton medical detox will publish its Medicare status when it opens.

Our hospital detox list covers the setting Part A pays for, and the New Jersey detox directory lists every licensed withdrawal management program alphabetically.

Plans covered on this page

• Medicare Part A
• Medicare Part B
• Medicare Advantage

This page is educational. Benefits and prior-authorization rules change; always verify with your plan’s member services line above.