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The AppealAid blog

Practical guides to denial letters, appeal deadlines, and medical-necessity paperwork — written to help you win your appeal, not to sell you something.

October 13, 2026 · 9 min read · By Danny

Letter of Medical Necessity Form: Field-by-Field Guide

Twelve fields every letter of medical necessity needs, who is legally allowed to sign it, what FSAFEDS requires that insurers don't (and vice versa), plus annotated examples for veneers and inversion tables.

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October 13, 2026 · 8 min read · By Danny

Letter of Medical Necessity for Infrared Sauna: HSA/FSA Guide

What an infrared sauna letter of medical necessity must contain, how to get one from a provider or telehealth visit, and the three-move playbook when your administrator denies the claim.

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