Letter of Medical Necessity

Also called: LMN, medical necessity letter

A letter of medical necessity is a statement, usually written by your treating provider, that explains why a specific service or medication is appropriate and necessary for your condition. It ties your diagnosis and history to the requested treatment and often cites supporting evidence. A strong letter is frequently the deciding factor in overturning a medical-necessity denial.

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Disclaimer: This definition is provided for general educational purposes only and is not legal, medical, or insurance advice. Insurance rules, deadlines, and terminology vary by plan, state, and over time. Always check your own plan documents and confirm current details before acting.