Prior authorization, step by step
Most GLP-1 prescriptions under Medicare require prior authorization. Here's exactly what that means and how to get to "approved."
Prior authorization (PA) is your plan's way of confirming a medication is medically appropriate before it agrees to cover it. For GLP-1 drugs, the plan typically wants to see your diagnosis, relevant lab values, and sometimes a record of other treatments you've tried. Done right, the process is mostly paperwork your prescriber handles — but knowing the steps helps you avoid delays.
The 5 steps
- Your prescriber confirms a qualifying diagnosis. The diagnosis code on the request must match a covered indication.
- They submit the PA request to your Part D plan. Usually electronically, with supporting clinical notes.
- The plan reviews (typically within 72 hours; 24 hours if expedited). They may approve, deny, or ask for more information.
- If approved, you fill at an in-network pharmacy. Your covered copay applies. Approvals are often time-limited and need renewal.
- If denied, you appeal. You have the right to a redetermination — see below.
Common reasons PAs get denied
- Diagnosis doesn't match a covered indication
- Missing labs (e.g., A1C) or documentation
- "Step therapy" — plan wants another drug tried first
- Drug isn't on the plan's formulary
- Quantity or dose outside plan limits
How to appeal a denial
Medicare gives you a multi-level appeals process. Start with a redetermination request to your plan, usually within 60 days of the denial. Include a letter of medical necessity from your prescriber. If still denied, you can escalate to an independent review.
Source: CMS.gov — Part D coverage determinations & appeals.
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