Does insurance cover the full cost of rehab?

Rarely in full. Most plans cover a percentage of the cost after any deductible or copay, and the exact share depends on whether the facility is in-network and which level of care was authorized.

How long will insurance pay for rehab?

There is no fixed number of days. Insurers typically approve treatment in short increments, often 3 to 7 days at a time, then re-review the clinical documentation before extending coverage further.

What is the difference between in-network and out-of-network coverage?

In-network facilities have a negotiated rate with your insurer, which usually means a lower out-of-pocket cost and simpler billing. Out-of-network care can still be covered on many plans, but typically at a lower reimbursement percentage and with the patient responsible for the difference.

Can insurance deny coverage after treatment has started?

Yes, coverage can be reduced or ended mid-treatment if a utilization review decides the person no longer meets medical necessity for that level of care. Facilities can appeal this decision or request the person step down to a lower level of care instead.

What Health Insurance Actually Covers in Addiction Treatment

Updated August 10, 2026

Most health insurance plans cover a portion of addiction treatment, but the exact services, length of stay, and out-of-pocket cost depend on your specific plan, the level of care recommended, and whether the treatment provider is in-network. Coverage is never automatic, it is approved step by step based on documentation that shows the treatment is needed right now.

What services does insurance typically pay for?

Most plans cover medical detox, inpatient residential treatment, partial hospitalization, and outpatient counseling when a licensed provider documents that the level of care is appropriate. Coverage usually includes physician visits, nursing care during withdrawal, group therapy, and individual counseling sessions.

Medical detox and withdrawal management
Inpatient or residential rehab stays
Partial hospitalization programs (PHP)
Outpatient therapy and medication management

You can review the full breakdown of coverage categories on our cost and insurance hub, which tracks how plans in Los Angeles typically structure benefits.

How does the level of care affect what gets approved?

Insurance companies approve coverage for a specific level of care, not for treatment in general, so a plan may pay for detox but deny a 30 day residential stay if it decides outpatient care is sufficient. This decision is formally called a level of care determination, and it happens before and during treatment.

Detox may be approved first, with residential care requested separately
Outpatient or PHP care may be substituted if the insurer decides it meets the need

What is medical necessity and why does it matter for coverage?

Medical necessity is the clinical justification an insurer requires before paying for a specific service, and without it a claim is typically denied even if the plan technically covers that type of care. Our guide on what medical necessity means for rehab authorization walks through how clinicians document withdrawal risk, prior treatment attempts, and co-occurring conditions to support approval.

Why does coverage sometimes get reviewed again mid-treatment?

Insurance plans reserve the right to re-check whether continued treatment is still necessary, a process known as utilization review, and it can result in a shortened stay if the insurer decides the person no longer meets criteria for that level of care. This is explained in detail in our piece on utilization review in addiction treatment, and facilities in Los Angeles typically submit clinical updates every 3 to 7 days during active treatment to keep authorization current.

Does insurance cover treatment for stimulant use as well as other substances?

Yes, insurance plans generally apply the same medical necessity standards to stimulant use disorders as they do to opioid or alcohol treatment, though stimulant withdrawal rarely requires inpatient medical detox the way alcohol or benzodiazepine withdrawal does. If stimulant use is part of what you are dealing with, our guide on how to quit Vyvanse covers what that process usually looks like and where coverage questions tend to come up.

Where can you see what coverage actually looked like for other people?

Plan documents describe coverage in general terms, but real approval and denial patterns often differ from what the summary of benefits suggests. Our cost and insurance forum has threads where members share what their specific plan approved, denied, or required an appeal to reverse.

What should you ask your insurer before starting treatment?

Ask for the specific level of care being authorized, the number of days approved, and whether continued stay reviews happen weekly or at another interval. Also ask whether your plan requires prior authorization or only concurrent review.

What level of care is authorized right now
The number of days or sessions approved
When the next utilization review is scheduled
Whether the facility is in-network or out-of-network

Frequently asked questions

Cost and Insurance

What a Level of Care Determination Is (What Members Tell Us It's Really Like)

A level of care determination decides which treatment setting fits your needs right now, and it can shift up or down as your condition changes.