Prior authorization
Also called: prior auth, PA, preauthorization, precertification, prior approval
Clinical reviewer: Elena Gizzi, MSN, RN · Last checked September 15, 2026
What is prior authorization?
Prior authorization is approval your health plan requires before it will cover a specific service or prescription, such as a GLP-1 medication. Your prescriber submits evidence that the drug is medically necessary, and the plan approves or denies it. Approval is not a payment guarantee, and it is often needed before a pharmacy can fill the prescription.
Why do plans require prior authorization for GLP-1 medications?
It is a coverage decision, not a clinical one. Federal guidance describes it as the plan deciding a service or drug is medically necessary under its own rules, and it may require that before you receive care, except in an emergency [1]. For GLP-1 medications, the request comes from your prescriber. A quarter of insured adults say terms like "prior authorization" are hard to understand [3].
How long does prior authorization take?
A federal rule finalized in January 2024 requires Medicare Advantage, Medicaid and CHIP plans to decide within 72 hours for urgent and seven calendar days for standard requests, from 2026, with a specific reason for every denial. It does not apply to prescription drugs [4]. For a GLP-1, the timeline is set by your plan and state law, so ask for it when the request is submitted.
What happens if prior authorization is denied?
You can appeal. First an internal appeal, where the plan reviews its own decision, then an external review by an independent third party, where the plan no longer has the final say. Urgent cases must be sped up [2]. Denials are common: in 2023, 16% of insured adults reported a denied or delayed prior approval in the past year [3].
Frequently asked questions
Does prior authorization guarantee my plan will pay?+−
No. Federal consumer guidance states preauthorization is not a promise your plan will cover the cost. Your deductible, copay and coverage limits still apply.
Is prior authorization required in an emergency?+−
Plans may require it before certain services, except in an emergency. A routine GLP-1 prescription is not an emergency, so expect the review before the pharmacy can fill it.
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This entry is for education and is not medical advice. Talk with a licensed clinician about your own situation before starting, stopping, or changing any treatment.
