What is a Letter of Medical Necessity?Updated 19 days ago

A Letter of Medical Necessity (LOMN) is a document written by a healthcare provider that explains why a specific medical service, treatment, or equipment is necessary for a patient's health. In relation to an HSA (Health Savings Account) or FSA (Flexible Spending Account), an LOMN is often required for reimbursement of expenses that are not clearly defined as eligible under the standard IRS guidelines.