How to get FSA/HSA receipts and documentation
Last updated: February 18, 2026
When you make a purchase using Flex to pay with your HSA/FSA card, you'll automatically receive an itemized receipt via email shortly after checkout is completed. This receipt contains all the necessary information for FSA/HSA reimbursement or record-keeping purposes.
What you'll receive
Depending on your purchase, you may receive:
Itemized receipt - Shows product description, price, shipping, and tax costs (sent to all customers)
Letter of Medical Necessity (LOMN) - Required for dual-purpose items that have both cosmetic and medical uses
If you can't find your receipt
If you didn't receive your receipt or can't locate it:
Check your spam/junk folder for emails from
notifications@withflex.comContact support@withflex.com to request a fresh copy
Important requirements
You must select "Flex | Pay with HSA/FSA" as your payment method at checkout to receive FSA/HSA documentation. If you paid with a regular credit card or didn't use Flex's payment processing, we cannot provide FSA/HSA receipts or documentation.
Product categories
The IRS recognizes two main categories of products:
Auto-substantiated items - Products with only medical use that are automatically eligible. These only require an itemized receipt.
Dual-purpose items - Products with both cosmetic and medical uses. These require both an itemized receipt and a Letter of Medical Necessity.
If your FSA rejects your claim
If your FSA administrator requests additional documentation:
For auto-substantiated items, only the itemized receipt should be needed
For dual-purpose items, submit both the itemized receipt and Letter of Medical Necessity
Contact our support team if you need an updated receipt with more detailed product descriptions
All receipts and documentation adhere to strict IRS standards and cannot be customized beyond what's required for compliance.