A Letter of Medical Necessity (LMN) is a document from your healthcare provider that explains why a specific product or service is recommended to treat or manage a diagnosed medical condition.
This letter is often required by HSA or FSA providers when a product—such as a supplement or wellness item—is not automatically classified as eligible for reimbursement.
A valid LMN typically includes:
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The patient’s name
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The medical condition being treated
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The recommended product or service
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The duration of use
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The provider’s signature and contact information
If your provider gives you an LMN, you can submit it to your HSA/FSA administrator along with your receipt to request reimbursement.
Flex works with telehealth to provide these letters for each product.