The Anatomy of a Successful Appeal Letter

If your prior authorization for a GLP-1 medication has been denied, an appeal is your next step. Many patients give up at this point — which is understandable, because the process can feel opaque and the outcome uncertain. But insurance denials are reversed on appeal more often than most people realize, especially when the appeal is well-constructed.

A strong appeal letter isn't a formal legal document, and it doesn't require a lawyer. It's a focused, factual response to the insurer's stated reason for denying the claim — written by or in coordination with your physician, supported by medical documentation.

This article walks you through how that letter is built.

Before You Write: Understand What You're Responding To

The most common mistake in appeals is writing a general argument for why the medication is good medicine. That can be part of an appeal, but it's not sufficient on its own.

A successful appeal is a direct response to the denial. The insurer said no for a specific reason. Your appeal needs to address that reason specifically, with evidence.

That means the first step is reading your denial letter carefully and identifying:

1. The stated reason for denial (clinical criteria not met, step therapy not satisfied, not medically necessary, etc.)
2. The specific criteria the insurer applied
3. Any gaps in the submitted documentation that the insurer identified

If you haven't done this yet, start with our article on how to read a denial letter. You need the full letter — not a summary from the pharmacy — before you write a word of your appeal.

Who Writes the Appeal?

Appeals can be written by:

• Your physician — This is the most effective approach. A letter from the prescribing doctor, signed and on office letterhead, carries significant weight. The physician can speak directly to your clinical situation, the medical rationale for the specific medication, and why alternatives are not appropriate.
• You, the patient — You have the right to appeal on your own behalf. A well-written patient appeal letter can be effective, particularly for administrative or procedural denials.
• Both, together — The strongest appeals often include both a physician letter and a patient statement. The physician makes the clinical case; the patient describes the impact on their daily life and health.

In practice, your doctor's office typically takes the lead. Tell them you want to appeal and share the denial letter with them. Ask specifically about a peer-to-peer review (more on this below) and a formal written appeal.

The Structure of an Effective Appeal Letter

Whether your doctor is writing the letter or you are, it should follow this basic structure:

1. Opening: Identify the Claim and the Decision

Start with the administrative basics. This establishes what you're appealing.

"This letter is submitted as a formal appeal of the prior authorization denial for [medication name], issued on [date of denial], for patient [name], date of birth [DOB], member ID [number]. The denial was received on [date]."

Include:

• Patient name and ID number
• Name of the medication denied
• Date of the denial
• Any reference numbers or denial codes from the letter

2. State Your Clinical Basis

Next, present the medical context. Why is this medication appropriate for this patient?

This section should include:

• Diagnosis. State the relevant diagnoses clearly, using both plain language and ICD-10 codes if possible (your doctor's office will know these).
• Current clinical status. BMI, weight, relevant vital signs, comorbidities. Be specific — "BMI of 36.2 with documented hypertension and obstructive sleep apnea" is more compelling than "obese with health problems."
• Treatment history. What has been tried and failed? Document prior dietary interventions, behavioral counseling, other medications. Specifics matter: what was tried, for how long, and what the outcome was.

3. Address the Denial Reason Directly

This is the core of the appeal. Take the insurer's stated reason and respond to it point by point.

If denied for not meeting clinical criteria:

"The prior authorization request meets your published criteria for coverage. The patient has a documented BMI of [X], which exceeds the required threshold of 30. The patient also has [comorbidity], which satisfies the plan's requirement for at least one qualifying weight-related condition. All eligibility criteria listed in your coverage policy are met."

If criteria weren't clearly met in the original submission, explain why they should be considered now:

"The original submission did not include the patient's most recent weight documentation, which was obtained on [date] and confirms BMI of [X]. We are submitting this now as additional supporting evidence."

If denied for step therapy:

"The patient has previously attempted [step medication] at [dose] from [date] to [date]. This trial resulted in [inadequate weight loss / intolerable side effects / contraindication]. Documentation of this prior trial is attached. The step therapy requirement has been satisfied."

Or, if requesting an exception:

"The step therapy requirement requires the patient to try [medication]. This is contraindicated for this patient because [reason — e.g., history of pancreatitis, cardiac contraindication, prior adverse reaction]. Attached please find documentation of this contraindication."

If denied as not medically necessary:

"We respectfully disagree with the determination that this medication is not medically necessary. The patient has Class II obesity (BMI [X]) with [comorbidities]. Obesity is a recognized chronic disease. Pharmacotherapy is an evidence-based, guideline-recommended treatment for patients at this clinical threshold. The prescribed medication has FDA approval for this indication. The medical necessity standard has been met."

4. Cite Clinical Guidelines (Without Overdoing It)

Brief references to major clinical practice guidelines strengthen the medical necessity argument. You don't need footnotes or a bibliography — just clear references.

Your doctor might write something like:

"The American Society of Metabolic and Bariatric Surgery, the Obesity Medicine Association, and the Endocrine Society all support pharmacotherapy for obesity in patients with BMI ≥ 30 or BMI ≥ 27 with comorbidities. This prescription follows established clinical guidelines."

5. Attach Supporting Documentation

List every document you're including and make sure they're actually attached. Common supporting documents include:

• Office visit notes documenting weight, BMI, comorbidities, and treatment history
• Lab results (relevant metabolic panels, HbA1c if diabetic, lipid panels if dyslipidemia is a comorbidity)
• Records from prior medication trials
• Letters from other treating physicians who can speak to the patient's overall health
• Peer-reviewed studies or clinical guidelines (your doctor can choose appropriate references)

6. State What You're Requesting

Be explicit about the outcome you want.

"We respectfully request that the prior authorization for [medication, dose] be approved for [treatment period, e.g., 12 months] with subsequent renewal reviews as clinically appropriate."

7. Closing and Deadline Note

Note any time sensitivity:

"Given the patient's clinical status and the ongoing impact of untreated obesity on their health, we request expedited review of this appeal where possible. Please direct your response to [contact information for doctor's office]."

Peer-to-Peer Review: Often More Effective Than a Letter Alone

Before or alongside a written appeal, ask your doctor to request a peer-to-peer review — a direct phone call between your doctor and the insurer's medical reviewer. This is one of the most effective tools available and is underused.

In a peer-to-peer, your doctor speaks directly to the physician making the coverage determination. They can clarify information, answer questions in real time, and make the clinical case conversationally — which is often more effective than a written letter alone.

Peer-to-peer reviews are requested by calling the insurer's prior authorization line and asking specifically. There may be a limited window (often a few business days after the denial) to request one, so don't wait.

If Your Internal Appeal Is Denied

If the internal appeal fails, you have additional options:

• External independent review: An independent reviewer outside the insurance company evaluates your case and makes a binding decision. Insurers lose these more often than most patients expect. The denial letter and your internal appeal decision letter will explain how to request this.
• State insurance commissioner complaint: For fully insured plans, your state's insurance commissioner can investigate improper denials. This won't speed up your coverage, but it creates accountability and sometimes prompts reconsideration.
• Contact your state insurance commissioner or attorney general: Some states have patient protection offices that can intervene on your behalf.

The Bottom Line

A successful appeal is specific, documented, and directly responsive to the reason for denial. It's not a plea — it's an argument. The more precisely it addresses the insurer's stated criteria, the stronger it is.

Your doctor is your most important partner here. Give them the denial letter, ask about a peer-to-peer review, and work with them on the written appeal. The process takes time and energy, but reversals happen regularly — and the outcome is worth fighting for.