Where is my Letter of Medical Necessity (LOMN)?

Last updated: August 19, 2025

When you purchase eligible products using HSA/FSA payment through Flex, you should automatically receive a Letter of Medical Necessity (LOMN) via email. Here's what you need to know:

When will I receive my LOMN?

The Letter of Medical Necessity is typically emailed within 30 minutes after checkout completion. In some cases, it may take up to 24 hours if the physician needs to review it more closely before signing off.

Where to look for your LOMN

Check both your inbox and spam/junk folder for an email with the subject line "Your Letter of Medical Necessity" sent from Flex.

What if I can't find my LOMN?

If you've checked both your inbox and spam folder and still can't locate the email:

  1. Contact Flex support at support@withflex.com

  2. Include your order number in your message

  3. Our support team can verify that the LOMN was sent and resend it if necessary

Important notes

  • The LOMN is only generated when you select "Flex | Pay with HSA/FSA" as your payment method during checkout

  • If you used a regular credit or debit card, you won't receive an LOMN automatically

  • One LOMN typically covers all purchases from the same merchant for one year

  • Multiple documents may be attached to the same email - check that you've downloaded all attachments

If you need assistance locating your LOMN or have questions about your HSA/FSA purchase, don't hesitate to reach out to our support team at support@withflex.com.