No, unfortunately, this isn't a supported feature right now. If there are insufficient funds in a single HSA or FSA account, you can instead enter a credit card on the Flex(opens in a new tab) checkout page. You will receive an itemized receipt and/or Letter of Medical Necessity from Flex(opens in a new tab), which you can submit for reimbursement.
I would like to use multiple HSA/FSA cards to pay for an item. Can I do that?
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