A strong appeal letter answers the insurer's stated reason for denial, point by point, with documents to back each point. A general plea for coverage rarely does that. The structure below is a good place to start.
Start with the denial reason, not your story
A common mistake is to open with a general explanation of why you need the medication instead of addressing the reason coverage was denied. Before you write anything, find the exact denial code or explanation on your denial letter. That's what your appeal has to answer. This guide complements our broader overview of what a successful appeal campaign looks like.
A working structure
1. Identify the claim and denial clearly. At the top of the letter, include your member ID, the medication and date of the denied claim, and the denial reason exactly as the insurer stated it.
2. Answer the stated reason directly. If it was denied as "not medically necessary," include specific clinical documentation: BMI, relevant comorbidities, prior treatment history. If it was denied for "step therapy not completed," document any relevant treatments you've already tried, or ask your prescriber to request a step-therapy exception based on your medical history. Many states require insurers to offer that kind of exception process, though state step-therapy laws don't apply to self-funded employer plans (steptherapy.com, updated May 2025 (external link)). If it was denied as an "excluded benefit," you may need a different approach altogether. Check whether the exclusion is plan-wide. If it is, an appeal may not be the right lever, and our guide on employer plan coverage is the better starting point.
3. Include supporting clinical documentation. Ask your prescriber's office for a letter of medical necessity, relevant lab values, and your treatment history. An appeal with clinical backing is usually more persuasive than one from the patient alone.
4. State clearly what you're asking for. Be explicit: approval of the specific medication, dose, and duration your prescriber has prescribed.
5. Note any time sensitivity, if it applies. A documented health risk from delay makes the case for urgency without any need for drama.
6. Include your contact information and preferred response method, and note the appeal deadline you're filing within.
A few practical notes
- Keep a copy of everything you submit, with the date and how you sent it. Many insurers require a specific fax number or portal.
- Follow up if you don't hear back within the plan's review window. Appeals have legally required response times in most cases. Under federal rules for most non-grandfathered plans, that's generally 30 days for a pre-service request, 60 days for a claim after care, and 72 hours for urgent care; confirm your own plan's current window. It's reasonable to call and confirm your appeal was received.
- If the first-level appeal is denied, you're usually not done. Our guide on escalation paths covers what comes next.
This article is general education, not medical, legal, or insurance advice. Coverage rules, appeal rights, and policy details vary by plan and location and change over time. Confirm specifics with your plan, prescriber, or a qualified advisor.