HSA/FSA water filter reimbursement: documents checklist
Use this checklist to make sure your water-filter reimbursement goes through the first time. It covers exactly what to gather before, during, and after the purchase — and how to submit it.
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The short list
You need three things: a Letter of Medical Necessity dated on or before purchase, an itemized receipt, and proof of payment. Keep them together and you are covered.
The core documents
- Letter of Medical Necessity (LMN). From a licensed provider, dated on or before the purchase, naming the condition and the filtration recommendation. See the LMN guide and template.
- Itemized receipt. Showing the product name, date, and amount — not just a card statement line.
- Proof of payment. Card record or order confirmation, in case the administrator asks.
- Renewal letter (for replacements). If you reimburse ongoing cartridges past the letter's validity window.
Checklist: before, during, and after purchase
Before
Test your water or pull your report; confirm your balance and any deadline; choose the system that matches your contaminant.
During
Obtain the Letter of Medical Necessity (the checkout route issues it automatically); pay with your HSA/FSA card or note the amount for reimbursement.
After
Download and file the letter, itemized receipt, and payment proof together; submit a claim if you paid out of pocket.
How to submit (if reimbursing)
Log in to your administrator's portal, open the claims or "reimburse myself" section, enter the expense, and upload the letter and itemized receipt. Track the claim to completion and keep copies. Full detail is in how to get reimbursed.
Recurring replacement filters
For each replacement, keep an itemized receipt and confirm whether your letter is still within its validity window; renew if needed. See replacement cartridge eligibility for the routine.
One-folder ruleKeep everything — letter, receipts, payment proof — in a single labeled folder (digital is fine). It turns any future request into a 30-second task and is the simplest way to avoid a denial.
Start with clean records
Buy where the letter is issued at checkout
SpringWell's TrueMed checkout produces the Letter of Medical Necessity at purchase, so your first and most important document is handled automatically.
Shop eligible systems →What an itemized receipt must show
This is the document people most often get wrong. An acceptable itemized receipt names the product (the filtration system or cartridge), the date, the amount, and ideally the seller. A credit-card statement line showing only a dollar amount and merchant name is not enough on its own. If you buy online, save the order confirmation and invoice, not just the bank charge.
Digital vs paper records
Either is fine — what matters is that documents are legible, complete, and kept together. A simple approach: create one folder named for the purchase, drop in the letter, receipt, and payment proof, and back it up. For HSAs especially, you may need these years later, so digital copies with a backup are the safest choice.
Keep a copy of this checklist
Before any eligible water purchase, run the three-line test: letter dated on or before purchase, itemized receipt in hand, payment proof saved. If all three are yes, you are ready — and if your administrator ever asks, you can respond in minutes.
Frequently asked questions
What documents do I need to reimburse a water filter?
A Letter of Medical Necessity dated on or before purchase, an itemized receipt showing the product and amount, and proof of payment. Keep a renewal letter for ongoing replacements.
Is a card statement enough?
No. You need an itemized receipt that names the product, date, and amount. A statement line alone is usually rejected.
How long should I keep the documents?
Through the plan year and run-out period for an FSA; indefinitely for an HSA, which can be reviewed years later.
By Stephen EvangelistaWater-treatment researcher · How we verify eligibility · Updated June 16, 2026