Whether you paid with your benefits card or out of pocket, here is how to get a water filter properly reimbursed from your FSA or HSA — the documents to keep, how to submit a claim, and how to handle recurring replacement filters.
The essentials
Keep your Letter of Medical Necessity and itemized receipt, then either pay with your card or submit a claim for reimbursement. Good records are the difference between smooth reimbursement and a denial.
There are two clean paths, and you can mix them:
For the purchase itself, see the step-by-step buying guide.
Most FSA/HSA providers have an online claims or "reimburse myself" section.
Attach the Letter of Medical Necessity and itemized receipt.
Reimbursement timelines vary — often a few business days to a couple of weeks.
Retain everything even after reimbursement; HSAs in particular can be reviewed years later.
Replacement cartridges can be reimbursed on the same basis as the system — keep an itemized receipt for each, and note that you may need a renewed letter once the original lapses. See replacement cartridge eligibility for the routine.
If a claim is questioned or denied, it is almost always a documentation or timing issue, not the product. Our guide to avoiding a denied claim covers the common causes and how to respond.
SpringWell's TrueMed checkout issues the Letter of Medical Necessity at purchase, so your reimbursement records are correct from day one.
Shop eligible systems →The documentation is the same, but the mechanics differ. With an FSA, you typically submit a claim to your employer's administrator, who reimburses from your pre-funded balance — and unspent funds usually expire December 31. With an HSA, you control the account: you can pay directly, or reimburse yourself at any time (even years later) as long as the expense was qualified and the letter predates it. See HSA eligibility and FSA eligibility for the account-specific rules.
Say a $2,400 combo system exceeds your $1,500 FSA balance. You pay $1,500 with your FSA card and $900 on a regular card at checkout. For the $1,500, you keep the letter and itemized receipt; if your plan requires substantiation, you upload both. The $900 remainder is simply a normal purchase. Clean records on the qualified $1,500 are all you need — see the denial-avoidance guide to keep it smooth.
Keep your letter and receipts for as long as the account could be reviewed. For FSAs, retain them at least through the plan year and any run-out period. For HSAs, keep them indefinitely — you may reimburse yourself far in the future, and HSA records can be examined years after the expense. A single labeled folder (digital is fine) makes this painless.
Keep your Letter of Medical Necessity and itemized receipt, then submit a claim through your administrator's portal with those documents attached, or pay directly with your FSA card.
A Letter of Medical Necessity dated on or before purchase, an itemized receipt showing the product and amount, and proof of payment if requested.
It varies by administrator, commonly a few business days to a couple of weeks after you submit a complete claim.
Yes, on the same medical-necessity basis. Keep a receipt for each replacement and renew the letter if required once the original lapses.
