The five-step appeal process
Get the denial in writing
Call the number on your insurance card and request the Explanation of Benefits plus the specific denial reason code. Verbal explanations from the pharmacy counter are often wrong — the coded reason determines your entire strategy.
Identify what actually happened
Missing prior authorization, unmet BMI documentation, step therapy, non-preferred brand, and blanket exclusion are five different problems with five different fixes. Match your denial to the table below before writing anything.
Let your prescriber fix it first
Most denials are administrative. A corrected prior authorization or a peer-to-peer review — a direct call between your prescriber and the insurer's medical reviewer — resolves a large share of cases in days rather than weeks.
File the internal appeal
You generally have 180 days. Include member ID, denial reference number, the requested drug and dose, your BMI, documented comorbidities, prior treatments tried and why they failed, and a medical necessity statement from your prescriber. Attach chart notes.
Escalate to external review
If the internal appeal is denied, request an independent external review — typically within 4 months. An outside physician reviews the case, and the decision is binding on the insurer. Your state insurance department can help if the plan stalls.
Why GLP-1 claims get denied
| Denial reason | What it means and what to do |
|---|---|
| Plan excludes weight loss drugs entirely | The most common denial. Many employer plans carve out "anti-obesity medications" as a category. An appeal rarely overturns a written exclusion — but a different indication (sleep apnea for Zepbound, cardiovascular risk for Wegovy) may be covered under a separate benefit. |
| Prior authorization not on file | A paperwork denial, not a real one. Your prescriber submits a PA with your BMI, comorbidities, and treatment history. These are approved routinely once submitted correctly. |
| BMI or comorbidity criteria not documented | The plan wants proof you meet the FDA label: BMI 30+, or 27+ with a weight-related condition. Often the chart has the data but the PA form did not include it. Fixable with a corrected submission. |
| Step therapy not completed | The plan requires you to try a cheaper option first — often phentermine, metformin, or an older GLP-1. Document past attempts, including side effects or lack of results, to request a step-therapy exception. |
| Non-preferred brand | The plan covers Wegovy but not Zepbound, or vice versa. Switching to the preferred product is usually faster than appealing, unless there is a clinical reason you need the specific drug. |
What to include in the letter
- Member ID, group number, and the denial reference number
- The exact medication, strength, and quantity requested
- Your BMI, plus every documented weight-related condition (hypertension, prediabetes, sleep apnea, dyslipidemia)
- Prior treatments tried, dates, and why each failed — this defeats step therapy
- A medical necessity statement signed by your prescriber
- Supporting chart notes, labs, and the FDA-approved indication that matches your case
If the appeal fails
A blanket exclusion usually survives appeals. The realistic fallbacks are manufacturer direct pricing, which now costs less than the compounded market it replaced:
| Option | Typical cost |
|---|---|
| LillyDirect Zepbound vials | $349–$499 / month |
| NovoCare cash-pay Wegovy | ~$499 / month |
| Manufacturer savings card (eligible commercial plans) | As low as $25 / month |
Also worth checking: whether a different approved indication applies to you. Zepbound is approved for obstructive sleep apnea and Wegovy for cardiovascular risk reduction — both are covered under benefits that a weight-loss exclusion does not touch.
Frequently asked questions
How long do I have to appeal a GLP-1 denial?
For most commercial plans you have 180 days from the denial notice to file an internal appeal. The plan must respond within 30 days for pre-service requests. If the internal appeal fails, you generally have 4 months to request an external review by an independent third party — and that decision is binding on the insurer.
What should be in the appeal letter?
Your name, member ID, and the denial reference number; the specific medication and dose requested; your BMI and documented weight-related conditions; a treatment history showing what you have already tried and why it failed; and a clear statement from your prescriber that the medication is medically necessary. Attach chart notes, lab results, and the FDA label indication that matches your situation.
Does a peer-to-peer review help?
Often, yes — and it is faster than a written appeal. Your prescriber requests a direct call with the insurer's medical reviewer to argue the case physician-to-physician. Ask your clinic to request one; many denials are reversed on that call.
What if my plan flat-out excludes weight loss medication?
A blanket exclusion is contractual, and appeals rarely change it. Your realistic options: check whether a different covered indication applies (Zepbound for obstructive sleep apnea, Wegovy for cardiovascular risk reduction in patients with established heart disease), ask HR whether the employer will add the benefit at renewal, or move to manufacturer cash-pay pricing.
What does it cost if the appeal fails?
Manufacturer direct programs are the fallback: NovoCare offers Wegovy around $499/month, and LillyDirect sells Zepbound vials at $349–$499/month. Manufacturer savings cards can bring eligible commercially-insured patients as low as $25/month. These are the same FDA-approved products, just purchased outside your pharmacy benefit.
Related reading
Educational content, not legal, insurance, or medical advice. Plan rules and deadlines vary — confirm yours with your insurer and prescriber. GLPFinders does not prescribe, sell, or dispense medications.