The cost of addiction treatment is one of the most significant barriers families face when trying to get a loved one into care. Understanding what insurance actually covers — and what questions to ask — can make the difference between accessing treatment and being overwhelmed before you even start.

The Legal Framework: What Insurance Must Cover

In the United States, the Mental Health Parity and Addiction Equity Act (MHPAEA) of 2008 and the Affordable Care Act (ACA) of 2010 together require that substance use disorder treatment be covered at the same level as medical and surgical care by most insurance plans. Addiction treatment is classified as an “essential health benefit.”

This means:

• Insurers cannot apply more restrictive limits to substance use treatment than they apply to other medical care
• Marketplace plans must cover substance use disorder services
• Medicaid expansion covers addiction treatment in participating states

In the UK, NHS treatment is available for addiction — including detox, outpatient counselling, and residential rehabilitation (though access varies significantly by area and waiting lists can be long). Private insurance typically covers some level of residential treatment.

What Is Typically Covered

Most insurance plans in the US cover some or all of:

• Medical detox (usually inpatient, treated as a hospitalisation)
• Inpatient/residential rehabilitation
• Intensive Outpatient Programmes (IOP)
• Outpatient therapy and counselling
• Medication-Assisted Treatment (buprenorphine, methadone, naltrexone)
• Psychiatric evaluation and co-occurring disorder treatment

What Is Often Not Covered — or Partially Covered

• Luxury or resort-style rehabs — these often operate outside insurance networks
• Extended residential stays beyond what the insurer deems “medically necessary”
• Sober living homes (these are not medical facilities)
• Specific therapies or programmes not considered evidence-based by the insurer
• Out-of-network providers — covered at a lower rate or not at all

How to Verify Your Coverage

• Call the member services number on your insurance card and ask specifically: “What is covered for residential substance use disorder treatment? What is my deductible? What is my out-of-pocket maximum? Do I need prior authorisation?”
• Ask whether specific treatment facilities are in-network — this significantly affects cost
• Ask about the appeals process if coverage is denied
• Most quality treatment centres have insurance verification specialists who will do this for you — call them before calling your insurer

When Insurance Does Not Cover Enough

• Medicaid: If your loved one has low income, Medicaid covers addiction treatment in all states, with expanded coverage in ACA expansion states
• State-funded treatment: Every US state has publicly funded treatment programmes — SAMHSA’s treatment locator (findtreatment.gov) includes these
• Sliding scale clinics: Many outpatient providers offer sliding scale fees based on income
• SAMHSA grants: Some treatment centres receive SAMHSA block grant funding and offer free or heavily subsidised treatment
• Payment plans: Many facilities offer financing or payment plans for the portion not covered by insurance

What If Coverage Is Denied?

Insurance denials for addiction treatment are common — and they are frequently successfully appealed. If coverage is denied:

• Request the denial in writing with the specific reason
• Request an internal appeal — most insurers must respond within 72 hours for urgent care
• If the internal appeal fails, request an external review by an independent organisation
• Contact your state insurance commissioner if you believe the denial violates parity laws
• The treatment centre’s team can often assist with appeals — ask specifically for their utilisation review or insurance appeal support