If you are using insurance for a brand-name GLP-1 like Wegovy, Zepbound, or Mounjaro for weight management, there is a high probability you will encounter a prior authorization requirement. Roughly 30 to 60 percent of initial PA requests for GLP-1 weight-loss medications are denied on the first attempt.
That does not mean you cannot get coverage. It means you need to know how the process works.
What Is Prior Authorization?
Prior authorization (PA) is your insurance company's process for verifying that a prescribed medication is medically necessary before they agree to cover it. Your prescriber submits documentation, the insurer reviews it, and they approve or deny coverage.
For GLP-1 medications, insurers typically require evidence of medical necessity — documented BMI, comorbidities, and proof that you have tried other weight-loss methods first.
What Insurance Companies Want to See
| Requirement | What It Means |
|---|---|
| BMI documentation | Documented BMI ≥30 or ≥27 with comorbidities, ideally from a recent clinical visit |
| Comorbidity documentation | Diagnosis codes for hypertension, type 2 diabetes, sleep apnea, dyslipidemia, etc. |
| Step therapy | Evidence that you have tried and failed diet/exercise, and sometimes other medications first |
| Lab work | A1C, fasting glucose, lipid panel — varies by insurer |
| Clinical notes | Prescriber documentation supporting medical necessity |
Step Therapy Explained
Many insurers require step therapy — meaning you must try lower-cost interventions (lifestyle changes, sometimes metformin or phentermine) before they will cover a GLP-1. Keep records of everything you have tried. Duration matters: most insurers want 3 to 6 months of documented effort.
How to Improve Your Approval Odds
Get your documentation in order before the PA is submitted. This is the most important step. Ensure your medical record includes current BMI, documented comorbidities with diagnosis codes, and a clear treatment history showing prior weight-loss attempts.
Ask your prescriber to include a letter of medical necessity. A well-written letter that explains why GLP-1 therapy is specifically appropriate for your clinical situation can significantly improve approval rates.
Know your formulary. If your insurer covers Wegovy but not Zepbound (or vice versa), ask your prescriber to adjust the prescription accordingly. Sometimes switching the specific medication is enough to get approval.
Request a peer-to-peer review if denied. Your prescriber can request a direct conversation with the insurance company's reviewing physician. This is often the most effective appeal strategy for first-time denials.
If your PA is denied, you have the right to appeal. Most insurance plans allow at least two levels of internal appeal plus an external review. Do not accept a denial as final without exploring your appeal options.
The Self-Pay Alternative
If insurance is not covering your GLP-1 prescription — or the PA process is taking too long — self-pay through telehealth is an immediate alternative. Compounded semaglutide and tirzepatide are available without insurance at significantly lower prices than brand-name list rates.
Sesame Care From $99/visit · Prescribes FDA-approved brand-name medications only. Accepts insurance. No subscription lock-in.
Prescribes FDA-approved brand-name medications only.
Oak Longevity $130/mo sema flat · Flat-rate pricing at any dose. $130/mo semaglutide, $199/mo tirzepatide. Free coaching. Cancel anytime.
⚕️ Compounded medications are not FDA-approved. They are prepared by licensed pharmacies under physician supervision.
Eden Health $239/mo sema · Physician-led telehealth. Semaglutide from $239/mo. Free consultation, ongoing clinical support, cancel anytime.
⚕️ Compounded medications are not FDA-approved. They are prepared by licensed pharmacies under physician supervision.
Timeline Expectations
Standard PA processing takes 5 to 15 business days. Urgent PAs may be processed within 24 to 72 hours if your prescriber documents a clinical urgency. If you are denied, the appeal process adds another 15 to 30 days per level.