How to write a medical necessity appeal

Understand what medical necessity means to the insurer

Insurers define medical necessity in their policy documents, and their definition may be narrower than what your doctor considers necessary. Before writing your appeal, find the exact definition in your policy and understand what criteria your treatment needed to meet. The appeal needs to demonstrate — with evidence — that the treatment met those criteria, not simply that your doctor recommended it.

Get a detailed letter from your treating physician

A physician’s letter is the most important document in a medical necessity appeal. It should not be a generic letter saying the treatment was needed. It should address the specific criteria in the insurer’s definition: what condition was being treated, what conservative treatments were tried first, why they were insufficient, and why the denied treatment was the appropriate clinical choice. The more specific the letter, the stronger the appeal.

Submit complete medical records

The insurer’s reviewer needs to see the clinical picture. Submit all relevant records — diagnosis, treatment history, test results, imaging reports, specialist notes. If the original denial was partly based on incomplete records, a complete submission alone may be enough to overturn it. Make sure everything is clearly labelled and that you reference each document in your appeal letter.

Cite the clinical guidelines

Medical necessity decisions are often made by reference to clinical guidelines published by professional medical bodies. If the treatment you need is recommended by relevant clinical guidelines for your condition, cite them. Your physician can help identify the relevant guidelines. Demonstrating that the treatment is consistent with accepted medical standards strengthens your case significantly.

This article is general information, not legal, medical, immigration or financial advice.