What prior authorization is
Prior authorization (PA) is an insurer’s way of confirming that a specific drug or service meets its coverage rules before agreeing to pay. Your prescriber submits a request — often documenting your diagnosis, relevant measurements, and treatments you’ve already tried — and the plan approves or denies coverage based on its criteria. Without that approval, the pharmacy claim can be rejected even though the prescription itself is valid.
Why GLP-1s so often need it
Because branded GLP-1 medications are expensive and in high demand, plans frequently place prior authorization on them, especially when prescribed for weight loss. Approval can hinge on things like a documented BMI, a qualifying diagnosis, or evidence you’ve tried other options first — the latter overlapping with step therapy. Whether a GLP-1 is covered at all also depends on the plan’s formulary.
Getting through it
The biggest lever is a complete, accurate request up front — missing documentation is a common reason for delay or denial. If you’re denied, it’s often not final: plans have appeals, and your prescriber can add records or request an exception. Knowing your plan’s criteria before you start helps; an insurance coverage check is a reasonable first step, and your prescriber’s office typically handles the submission.