GLP-1 Prior Authorization: How to Get Approved (and Appeal a Denial)

The fast answer

Most GLP-1 denials aren't "no" — they're "not enough paperwork yet." If your plan covers weight-loss GLP-1s at all, approval usually comes down to proving you meet the prior authorization (PA) criteria and documenting it cleanly. And if you're denied, you have a legal right to appeal — twice, including an external review by an independent doctor your insurer doesn't control³. Here's the working-mom version: what the PA wants, the documentation that wins, and the two-step appeal that flips a lot of denials.

This is educational only, not medical or legal advice — your prescriber and plan drive the specifics.

What a GLP-1 prior authorization actually checks

Prior authorization is your plan asking your prescriber to prove the drug is medically appropriate before it pays. For a weight-loss GLP-1, plans build their PA criteria around the FDA-approved indication. Wegovy's label covers adults with obesity, or overweight plus at least one weight-related condition (like hypertension, high cholesterol, or sleep apnea)¹; Zepbound's is the same shape². So a typical PA asks for:

• A qualifying BMI — commonly 30 or higher, or 27+ with a documented weight-related condition.
• The diagnosis coded correctly (obesity / overweight-with-comorbidity), not just "weight loss."
• Evidence of prior lifestyle effort — often a documented attempt at diet and exercise, sometimes a formal program.
• Sometimes step therapy (more on that below).

The single most common reason for a denial isn't that you don't qualify — it's that the submission didn't document that you qualify. That's fixable.

The documentation that gets you approved

Give your prescriber's office what they need to build a clean PA the first time. Before the visit, gather:

1. 1.Your BMI, in the chart. Height and weight recorded at the visit so the BMI is documented, not estimated.
2. 2.Your weight-related conditions. Hypertension, prediabetes or type 2 diabetes, high cholesterol, PCOS, sleep apnea, joint problems — anything diagnosed. One qualifying comorbidity can move you from "overweight" into the covered category.
3. 3.Your weight-loss history. Past diet programs, prior medications, the results. "Tried and didn't sustain" is exactly what the criteria expect to see.
4. 4.The right drug for the request. Make sure the PA names the weight-loss product (Wegovy/Zepbound) for the weight-management indication your plan covers — a mismatch here is an instant denial.

The clinical case is strong when it's documented: the pivotal trials showed roughly 15% mean weight loss with semaglutide⁴ and up to about 20% with tirzepatide⁵, which is why prescribers can credibly argue medical necessity. Your job is to hand them the facts that let them prove you fit the criteria.

Step therapy: the "fail first" hurdle

Some plans require step therapy — trying a preferred (usually cheaper) option first and documenting that it didn't work or wasn't tolerated, before they'll approve the GLP-1. If you hit this:

• Ask exactly what the required "step" is and whether a past attempt already counts. If you've previously tried and failed another weight-loss medication, that history may satisfy it.
• Request a step-therapy exception if the required drug is medically inappropriate for you (a contraindication, a bad prior reaction). Your prescriber submits this with the clinical reason.

Don't silently restart the whole ladder if you've already climbed part of it — documented past failures often count.

Denied anyway? Run the two-step appeal

A denial is the start of a process, not the end of it. You have formal appeal rights³:

Step 1 — Internal appeal. You ask your insurer to reconsider. Do it in writing, reference the denial letter's stated reason, and attach what was missing — the BMI, the comorbidity documentation, a letter of medical necessity from your prescriber. There are deadlines (often 180 days from the denial to file), so move promptly.

Step 2 — External review. If the internal appeal fails, you can escalate to an independent external review — an outside physician, not employed by your insurer, decides. For medical-necessity denials this is powerful, because the decision is binding on the plan³. Your denial letter and Explanation of Benefits will tell you how to request it; there's usually a four-month window.

### The letter of medical necessity — the piece that wins appeals

Ask your prescriber for a letter of medical necessity that states, plainly: your diagnosis and BMI, your weight-related conditions, the treatments you've already tried and their outcomes, and why this specific GLP-1 is medically necessary for you. This one document is what most successful appeals turn on. A good telehealth clinician produces it as a matter of routine.

When the smarter move is to stop fighting

Appeals are worth it when your plan covers GLP-1s and just denied your submission. But if your plan flatly excludes anti-obesity medication, no appeal changes that — the benefit simply isn't there. Whether that's your situation depends on your plan design; our guide on whether insurance covers a GLP-1 for weight loss helps you tell the difference. If you're excluded, cash-pay is usually faster and cheaper than a brand copay anyway — see insurance vs cash-pay: the real monthly math before you spend weeks appealing a wall.

The decisive takeaway

Getting a GLP-1 approved is a documentation game: confirm your BMI and a qualifying comorbidity are in the chart, name the right drug for the weight-management indication, clear or except any step-therapy rule, and if you're denied, run the internal appeal then the binding external review — with a letter of medical necessity doing the heavy lifting. If your plan excludes weight-loss drugs entirely, skip the fight and go cash-pay: our #1 pick, CoreAge Rx, offers flat nationwide pricing and can supply the documentation you need, and it tops our Rx-Readiness Score methodology. Compare it on the best-value board or in CoreAge Rx vs Eden. Some links here earn us a referral fee, which never changes the ranking.