When a health insurance company denies a claim by stating a treatment is "not medically necessary" or "experimental," they are making a clinical assertion. To respond to a clinical denial, you cannot rely on administrative arguments. You must counter with clinical evidence.
One of the most useful parts of the response is your treating physician, and their primary tool is the Letter of Medical Necessity (LMN). An appeal package backed by a robust, evidence-based physician letter is often easier for reviewers to assess than one written by a patient alone.
Here is how you and your doctor can collaborate to write a stronger Letter of Medical Necessity and use peer-to-peer reviews where appropriate.
5 Useful Elements Of A Strong LMN
A generic note from a doctor stating, "The patient needs this treatment," will be immediately rejected by insurance reviewers. A strong LMN is usually detailed and structured around the following clinical pillars:
Establish the Physician-Patient Relationship: The doctor should state their credentials, specialty, and how long they have managed your care (e.g., "I am a board-certified neurologist, and I have treated the patient for severe migraine disease since January 2024.").
Specific Diagnosis and Severity: Cite the exact diagnostic codes (ICD-10 codes) and describe the clinical severity, symptoms, and limitations the condition imposes on your daily life.
Comprehensive Treatment History: This is the most critical element, especially for "step therapy" denials (where the insurer requires you to try cheaper drugs first). The letter must detail every treatment, drug, therapy, or dosage you have tried, how long you tried it, and why it failed (ineffectiveness) or was discontinued (adverse side effects).
Standard of Care and Clinical Guidelines: Cite established, national guidelines (such as those from the American Medical Association, National Comprehensive Cancer Network, or other specialty societies) and peer-reviewed journal articles proving the requested treatment is the accepted standard of care.
Clinical Consequences of Denial: Explicitly state the medical risks of not receiving the treatment. Will the patient face permanent joint damage, disease progression, hospitalization, or an emergency room crisis? Frame this in terms of patient health and long-term costs.
How to Help Your Doctor Overcome Administrative Burnout
Physicians are facing unprecedented administrative burnout. Prior authorizations and insurance paperwork consume hours of a doctor’s week. To get a high-quality LMN quickly, you can reduce their administrative burden:
Do the Prep Work: Provide your doctor's billing coordinator with a typed timeline of your medical history, including dates of previous treatments, medications tried, and side effects.
Share the Insurance Guidelines: If you obtained the insurer's clinical policy during your initial call, print it out and highlight the exact criteria. Tell your doctor, "The insurer's policy says they cover this if I have failed two previous drugs. Here are the dates I failed Drug A and Drug B so you can put them in the letter."
Draft and Sign: Some patients draft the personal history sections of the letter themselves and bring it to the doctor to review, edit, copy onto their official letterhead, and sign.
The Peer-to-Peer Review: Clarify The Medical Issue
If your doctor is willing, ask them to request a peer-to-peer review. This is a direct telephone conversation between your treating physician and the insurance company's medical director.
Why It Can Work: It asks the insurer's reviewer—who is often a generalist or someone practicing in a completely different medical field—to defend their decision to a specialist.
Speed: A peer-to-peer call may resolve some denials quickly, but it is not a substitute for tracking appeal deadlines.
Questions to Ask Your Doctor:
"Would you be willing to do a peer-to-peer review with the insurer's medical director to explain why this is necessary?"
"Are there specific clinical guidelines or clinical trials we can cite in our appeal letter to prove this is the standard of care?"
"Can we request a same-specialty clinical reviewer if the insurer's medical director denies the peer-to-peer review?"
How Caira by Unwildered can help
If you are staring at a denial letter, EOB, policy PDF, bill, or medical record and do not know what to ask next, Caira by Unwildered is AI help for healthcare paperwork. Upload the documents, ask questions, draft next-step messages, and turn the problem into a calmer checklist 24/7. Plans are $21/month, and you can start chatting in 30 seconds at https://caira.unwildered.co.uk.
Useful starting points
This article is general information, not medical, legal, insurance, or financial advice.
