First, find out which kind of denial you have, because each needs a different fix. If your plan excludes weight-loss drugs, an appeal rarely helps unless you’re using the drug for a covered condition. If the drug isn’t on the formulary or you’re asked to try another drug first, your prescriber can ask for an exception. If prior authorization was denied for missing documents, a complete resubmission is often fastest. Medicare has a separate 2026 program, the Medicare GLP-1 Bridge, with a $50 monthly copay for eligible people.
A formulary is your plan’s list of covered drugs. An exception is a request to cover a drug outside the list or its rules. This guide isn’t drug advice. It explains how pharmacy denials work from the billing side, so you can pick the right next step with your prescriber. The same logic works for other drugs that get denied.
Key takeaways
- Read the denial for four clues: “excluded,” “not on formulary,” “step therapy” or “prior authorization.” Each has its own path.
- ACA individual and small-group plans must offer a drug exception process. Standard requests must be decided within 72 hours, and urgent (“exigent”) ones within 24 hours (45 CFR 156.122(c)).
- Medicare Part D appeals must be filed within 65 days of the denial notice. Plans must decide standard drug appeals in 7 days and fast ones in 72 hours.
- From July 1, 2026, through December 31, 2027, CMS’s Medicare GLP-1 Bridge covers Wegovy, Foundayo and the Zepbound KwikPen for weight reduction for eligible Part D enrollees, with prior authorization and a $50 monthly copay.
How this guide was checked: rules come from the eCFR, Medicare.gov and CMS’s Medicare GLP-1 Bridge pages. Pharmacy reject code wording comes from California’s Medi-Cal Rx manual. Last reviewed 4 October 2026. This is educational content, not legal or medical advice.
Table of Contents
Which denial do you have? Read the letter in 30 seconds
| If the denial says… | What it means | Best next step |
|---|---|---|
| “Excluded,” “not a covered benefit,” “weight loss drugs not covered” | Your plan doesn’t cover drugs for weight loss | Check if you have a covered diagnosis. Otherwise, ask your employer or plan about coverage options |
| “Not on formulary,” “non-formulary” | The drug isn’t on the plan’s list | Prescriber files a formulary exception |
| “Step therapy,” “try preferred drug first” | Plan wants you to try another drug first | Prescriber files a step therapy exception, or documents past trials |
| “Prior authorization required” or “criteria not met” | Plan needs proof you meet its criteria | Prescriber resubmits with complete records, or you appeal |
| “Quantity limit” or “plan limitations exceeded” | Dose or supply is over the plan’s limit | Prescriber asks for a quantity limit exception |
What the pharmacy sees
At the pharmacy counter, the claim is “rejected” with an NCPDP reject code before you ever get a letter. These are common ones, with wording from California’s Medi-Cal Rx manual:
| Reject code | Wording | Plain meaning |
|---|---|---|
| 70 | “Product/Service Not Covered” | Often an exclusion |
| 75 | “Prior Authorization Required” | Prescriber needs to send a PA |
| 76 | “Plan Limitations Exceeded” | Quantity or days’ supply limit |
| MR | “Product Not on Formulary” | Formulary exception needed |
Ask the pharmacist: “What reject code and message did you get?” It’s the fastest way to know which path you’re on.
Pharmacy claims use these NCPDP codes. Doctor and hospital claims use different ones, the CARC codes in our denial code list. If you’re new to how claims move between providers and insurers, start with what medical billing is.
Exclusions: when an appeal won’t work (and when it might)
An exclusion means the plan document says it doesn’t pay for drugs used for weight loss. You can still file an internal appeal, but you’d need to show the plan applied its terms wrongly.
There’s one important exception. Some GLP-1 drugs are approved for conditions other than weight loss. CMS’s GLP-1 Bridge pages give two examples. One is Zepbound for moderate to severe obstructive sleep apnea in adults with obesity. The other is Wegovy to lower the risk of major heart events in adults with heart disease and either obesity or overweight. If your prescription is for a covered condition, ask your prescriber to make that clear in the request.
Formulary and step therapy exceptions
Do you have an ACA individual or small-group plan? Then 45 CFR 156.122(c) requires a drug exception process. You, someone you name or your prescriber can use it to ask for a drug the plan doesn’t otherwise cover.
| Exception type | Decision deadline | If approved |
|---|---|---|
| Standard exception | 72 hours after the plan gets the request | Covered for the length of the prescription, including refills |
| Expedited (“exigent”) exception | 24 hours | Covered for as long as the urgent situation lasts |
| External exception review (after a denial) | 72 hours standard, 24 hours expedited | An independent reviewer decides |
“Exigent circumstances” means a health condition that may seriously jeopardize your life, health or ability to regain maximum function, or that you’re in the middle of treatment with a non-formulary drug. That second point matters if your plan dropped a drug you already take.
Section 156.122 is written for plans that must cover essential health benefits, which generally means ACA individual and small-group plans. Large employer and self-funded plans still must follow the federal claims and appeals rules. You get at least 180 days to appeal. See our guide to appealing a “not medically necessary” denial for those steps.
Prior authorization denials for GLP-1 drugs
Many plans that cover these drugs require prior authorization, often with BMI, diagnosis and lifestyle-program documentation. When a PA is denied for “lack of documentation,” the fix is usually on the prescriber’s side: resubmit with the chart notes the criteria ask for. Our guide on what to do when prior authorization is denied covers peer-to-peer reviews and expedited appeals. For the documentation side, see what payers look for in medical necessity documentation.
Medicare: the 2026 GLP-1 Bridge and Part D appeals
CMS’s pages describe two separate routes for Medicare drug plan enrollees.
1. The Medicare GLP-1 Bridge (weight reduction). CMS runs this short-term program from July 1, 2026, to December 31, 2027. According to CMS:
- It covers Foundayo, Wegovy (injection and tablets) and the Zepbound KwikPen when used to reduce excess body weight and maintain weight reduction. Zepbound single-dose vials and pens aren’t included.
- You must be in an eligible Part D plan, and your prescriber must submit a prior authorization showing you meet BMI and health criteria. For example, a BMI of 35 or more, or lower BMIs with certain conditions.
- Eligible people pay a $50 copay per month.
- There’s no appeals process in the Bridge. A prescriber can resubmit the PA with corrected or new information.
2. Your Part D plan (covered conditions). CMS says type 2 diabetes, moderate to severe obstructive sleep apnea and certain liver disease (MASH) are covered under Part D. People with those diagnoses get the drug through their plan, not the Bridge. If your plan denies it, you can ask for a coverage determination or exception, and then appeal.
Medicare.gov says you must file a Part D appeal (redetermination) within 65 days of the denial notice. The plan must decide standard benefit appeals in 7 days and fast appeals in 72 hours. For an exception, your prescriber must give a statement explaining the medical reason.
Step-by-step: what to do after a Zepbound or Wegovy denial
- Get the exact denial reason. Ask the pharmacy for the reject code, and ask the plan for the written notice.
- Match it to the table above. Exclusion, formulary, step therapy, PA or quantity limit.
- Check your plan type. Employer, Marketplace, Medicaid or Medicare each have different rules.
- Ask your prescriber to file the right request. Give them the template below.
- Ask for an expedited review if you’re mid-treatment or your health could be seriously harmed by waiting.
- If denied, appeal and then ask for external review where available.
- Track deadlines and keep copies of every request, letter and call.
Free template: formulary or step therapy exception letter (for your prescriber)
[Prescriber letterhead] [Date] [Plan name] - Pharmacy Exceptions / Prior Authorization Fax: [ ] Re: [Formulary / Step therapy / Quantity limit] exception request Patient: [name] DOB: [ ] Member ID: [ ] Drug requested: [name, strength, dose, quantity] Diagnosis and ICD-10 code(s): [ ] I am requesting a [standard / expedited] exception for the drug above for my patient. Medical reasons: - Condition being treated: [diagnosis; state if it is a covered indication such as obstructive sleep apnea or cardiovascular risk reduction, if applicable] - Preferred or formulary drugs tried and results: [drug, dates, outcome or side effects] - Why the preferred drugs are not appropriate: [contraindication, expected adverse effect, or failed trial] - [If expedited:] The patient is currently being treated with this drug / waiting could seriously jeopardize the patient's life, health or ability to regain maximum function. Supporting records attached: [chart notes, labs, BMI history]. Please decide within the required timeframe and send the decision to me and the patient. [Prescriber name, credentials, NPI, phone, signature]
FAQ
Can I appeal if my plan excludes weight-loss drugs?
You can file an appeal, but an exclusion is hard to overturn because the plan never agreed to cover the drug for weight loss. If you’re using the drug for a covered condition, ask your prescriber to make that clear.
What’s the difference between a formulary exception and prior authorization?
A formulary exception asks the plan to cover a drug that’s not on its list. Prior authorization means the drug is on the list but needs approval first. Each uses a different form and deadline.
How fast must my plan decide a drug exception?
ACA individual and small-group plans must decide standard exceptions within 72 hours and urgent ones within 24 hours. For Medicare Part D appeals, standard decisions take up to 7 days and fast ones 72 hours.
Does Medicare cover Zepbound or Wegovy for weight loss in 2026?
Through the Medicare GLP-1 Bridge, eligible Part D enrollees can get Wegovy, Foundayo or the Zepbound KwikPen for weight reduction from July 1, 2026, to December 31, 2027. Their prescriber has to get prior authorization, and the copay is $50 a month.
What if my plan removed my drug from the formulary mid-treatment?
Ask your prescriber about an expedited exception. Under 45 CFR 156.122(c), being in the middle of treatment with a non-formulary drug counts as an exigent circumstance for ACA individual and small-group plans.
Related patient guides
Disclaimer: This article is educational and is not legal or medical advice. It doesn’t recommend any drug. Coverage depends on your plan, diagnosis and the plan’s current formulary, and Medicare programs for GLP-1 drugs are changing. Talk with your prescriber about treatment, check your plan documents, and confirm the latest rules at each linked source.
Written by Manikandan, RCM specialist at Medical Billing 101.
Sources
- eCFR, 45 CFR 156.122, Prescription drug benefits, retrieved 4 Oct 2026.
- CMS, Medicare GLP-1 Bridge: Information for Providers, retrieved 4 Oct 2026.
- CMS, Medicare GLP-1 Bridge: Information for Part D Plans, retrieved 4 Oct 2026.
- Medicare.gov, Appeals in a Medicare drug plan, retrieved 4 Oct 2026.
- eCFR, 29 CFR 2560.503-1, Claims procedure, retrieved 4 Oct 2026.
- California DHCS, Medi-Cal Rx Appendix D: NCPDP Reject Codes, retrieved 4 Oct 2026.
Manikandan is a Revenue Cycle Management (RCM) specialist with over 10 years of hands-on experience in US healthcare billing. He has worked extensively with commercial payers, Medicare, and Medicaid across multiple specialties including surgery, orthopedics, and radiology. Manikandan founded Medical Billing 101 to provide free, accurate denial code guides, CPT coding references, and Medicare billing resources for US medical billing professionals.
