How to Read a Prior Authorization Denial Letter

If your insurance company has denied coverage for a GLP-1 medication like Wegovy or Zepbound, you've probably received — or are about to receive — a denial letter. These letters are notoriously hard to read. They're written in bureaucratic language, filled with policy numbers and codes, and they often bury the most important information in dense paragraphs of legalese.

But here's the thing: the denial letter is actually your most important tool. It contains the specific reason your claim was denied, the exact criteria the insurer applied, and the instructions for how to appeal. Once you know how to read it, it stops feeling like a wall and starts feeling like a map.

This guide walks you through a typical denial letter section by section.

First: Make Sure You Have the Letter

If your pharmacy said your claim was denied but you haven't received an actual letter yet, get one. You are entitled to a written explanation of any coverage denial. Here's how to get it:

• Check your mail. Insurers are required to send denial letters by mail for prior authorization decisions. It may take a few days.
• Check your online member portal. Many insurers post denial decisions electronically in addition to mailing them. Log in and look for "claims," "authorizations," or "messages."
• Call member services. Tell them you received a denial and want a copy of the denial letter and the specific reason codes.

Don't rely on a verbal summary from your pharmacist or even your doctor's office. Get the actual document.

Section 1: The Decision Summary

This is usually near the top of the letter, sometimes in bold or in a highlighted box. It will say something like:

"Your request for coverage of [medication name] has been not approved / denied / adverse determination."

Insurers use different phrasing — "not approved," "denied," and "adverse determination" all mean the same thing. Don't be thrown off by the clinical-sounding language.

This section will also typically include:

• The name of the medication that was requested
• The dates of the request
• The date of the decision

If any of this information is wrong — wrong drug name, wrong patient, wrong dates — flag it immediately. Administrative errors can cause denials, and a correction may be quicker than a full appeal.

Section 2: The Reason for Denial

This is the most important section. Somewhere in the letter — sometimes clearly labeled "Reason for Denial," sometimes buried in a paragraph — is the specific reason the insurer declined to cover your medication.

Common reasons you'll see for GLP-1 denials:

• "Does not meet clinical criteria" — Your request didn't satisfy the plan's coverage requirements, usually related to BMI, diagnosis, or prior treatment history.
• "Drug not on formulary" — The prescribed medication is not covered under your plan's drug list.
• "Step therapy requirements not met" — You haven't tried the required alternative medication(s) first.
• "Not medically necessary" — A broad catch-all that the insurer uses when they believe the treatment isn't justified. This phrase doesn't mean your doctor is wrong; it means the insurer's review criteria weren't satisfied.
• "Quantity limit exceeded" — The amount requested exceeds what the plan allows per fill.
• "Prescriber does not meet requirements" — The doctor who wrote the prescription doesn't meet the plan's specialty or credentialing requirements.

There may also be a reason code (a number or letter code like "NCCC-27" or "PA-DENY-04"). Write this down — it's useful when you call member services or speak with your doctor's office.

Section 3: The Coverage Criteria That Were Applied

A good denial letter will include — or refer you to — the specific clinical criteria the insurer used when reviewing your request. This might be stated as:

"Coverage for [medication] requires: (1) BMI ≥ 30 kg/m², or BMI ≥ 27 kg/m² with at least one weight-related comorbidity; (2) documentation of a structured diet and exercise program; (3) prior trial of [alternate medication] for at least 90 days."

Read this carefully. It tells you exactly what the insurer was looking for. Compare it to what your doctor submitted. You may immediately notice a gap — a piece of documentation that wasn't included, a diagnosis that wasn't listed, or a trial that wasn't documented.

If the letter doesn't include the criteria, ask for it. You can request the insurer's Coverage Determination Guidelines for the medication. This is a longer document — sometimes called a clinical coverage policy — that spells out the full criteria in detail. Insurers are required to make this available.

Section 4: Your Right to Appeal

Every denial letter is required to explain your right to appeal, including:

• The type of appeal available — Most denials allow at least an internal appeal, and if that fails, an external independent review.
• The deadline to file — This is critically important. Appeal deadlines are real. Missing them can forfeit your right to appeal. Common deadlines are 60 or 180 days from the date of the denial.
• How to file — The letter should include an address, fax number, phone number, or portal link for submitting your appeal.
• What to include — Some letters list the types of supporting documentation the insurer will consider.

Mark the appeal deadline on your calendar the moment you read it.

Section 5: Expedited and Urgent Review Rights

If your situation is medically urgent — meaning waiting for the standard appeal process would put your health at serious risk — you may have the right to an expedited review. The letter should explain this. Expedited reviews are processed much faster than standard appeals (sometimes within 72 hours).

Talk to your doctor if you think your situation might qualify. They can help document urgency.

Section 6: External Review Rights

If your internal appeal is denied, you typically have the right to an external independent review — meaning an outside reviewer, not employed by your insurer, looks at your case and makes a binding decision. This is a powerful protection. Insurers lose a meaningful share of external reviews, and the decision is typically binding on the insurer.

The denial letter should tell you how to request an external review once your internal appeal is exhausted.

What to Do Once You've Read the Letter

After you understand what the denial says, here's a practical sequence:

1. Share the full letter with your doctor's office. They need to see the exact denial reason and criteria. Don't just summarize it — send or fax the whole thing.
2. Ask your doctor about a peer-to-peer review. This is a phone call between your doctor and the insurer's medical reviewer. It's often the fastest way to resolve a denial, especially for clinical criteria issues.
3. Start building your appeal. The denial letter is the blueprint. You're going to address each stated reason directly, with documentation.

For a full guide on writing that appeal, see The Anatomy of a Successful Appeal Letter.

A Note on Emotional Reactions

Reading a denial letter can bring up real feelings — frustration, confusion, even shame. These are completely understandable. Getting denied for a medication you need is not a reflection of your worth or your doctor's competence. Insurance coverage decisions are administrative processes, often applying blunt criteria to individual situations.

A denial means the review didn't go in your favor this time. It doesn't mean the decision is final, and it doesn't mean you can't get the medication you need.

Take a breath, read the letter carefully, and know that there's a path forward.