Insurance & cost

Understanding prior authorization for addiction treatment

Published December 1, 2024 · 7 min read · Updated April 2026

Reviewed for accuracy by licensed clinical professionals.

Prior authorization is insurance company approval required BEFORE certain treatments begin. Understanding the process reduces delays in getting help.

What requires prior auth

Residential treatment (almost always). PHP (usually). IOP (sometimes). MAT medications (rarely but some plans require step therapy). Detox may or may not require prior auth depending on plan.

How it works

The treatment facility submits clinical information to the insurance company. A clinical reviewer evaluates medical necessity using ASAM criteria. Approval authorizes a specific number of days or sessions. Continued stay reviews occur during treatment.

Getting approved

Provide detailed clinical documentation. Match symptoms to ASAM criteria for the requested level. Document failed lower levels of care. Note co-occurring conditions requiring intensive treatment. The treatment center typically handles this process.

If denied

Request a peer-to-peer review immediately. Appeal with additional documentation. Contact your state insurance commissioner if appeals fail. Many denials are overturned on appeal.

Authoritative sources

This article references guidelines from: SAMHSA · NIDA · ASAM

Frequently asked questions

What is prior authorization for rehab?

Insurance approval required before treatment begins, based on clinical documentation supporting medical necessity.

How long does prior authorization take?

Urgent requests: 24-72 hours. Standard requests: 5-15 business days. Many facilities can expedite urgent cases.

What if prior authorization is denied?

Request peer-to-peer review, appeal with additional documentation, and contact your state insurance commissioner if needed.

Disclaimer: Informational only. Not medical advice. SAMHSA: 1-800-662-4357.