Letter of Medical Necessity
A formal clinical document authored by a prescribing physician or orthotist that justifies the medical need for an orthotic device to an insurer or payer.
Full Definition
A Letter of Medical Necessity (LMN) is a structured document used in orthotics practice to demonstrate to a health insurer or payer that a prescribed orthotic device is clinically appropriate and not merely elective. It typically includes the patient's diagnosis, relevant clinical findings, functional limitations, the specific orthosis prescribed, and the HCPCS code. Editors reviewing LMNs must verify that the diagnosis terminology matches the corresponding ICD-10 code, that device descriptions align with HCPCS code definitions, and that the language is formal and free of unsupported claims. The document is also referred to as a 'letter of medical justification' in some jurisdictions.
Usage
Usage note: Capitalise as a proper document title when referring to the document type in formal contexts. The abbreviation 'LMN' may be used after the first full mention. Ensure clinical language is precise and avoids unsupported generalisations.
In Context
- "The orthotist submitted a Letter of Medical Necessity outlining the patient's foot drop and functional limitations to support the claim for a custom AFO." — Insurance claims submission
- "Editors of Letters of Medical Necessity should confirm that all diagnosis codes are ICD-10 compliant and consistent with the clinical narrative." — Editorial checklist for healthcare documents