Letter of medical necessity (LMN)

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A letter of medical necessity (LMN) is a piece of paper used to substantiate the need of an item of durable medical equipment. A medical necessity may be defined as a reasonable, necessary, and/or appropriate need, based on clinical standards of care. For Sleep Apnea patients, letters of medical necessity are usually written by a doctor's office and include appropriate details such as:

  • Patient name
  • Date of Sleep study
  • Diagnosis of Sleep Apnea
  • Statement indicating that the patient needs CPAP, BPAP, or APAP as "medical necessity".
  • Pressure settings
  • Physician contact information
  • Other pertinent information applying to the patient's need