Most denied water-filter claims fail for the same handful of avoidable reasons — and almost none of them are about the filter itself. Here is what trips people up, how to prevent each issue, and what to do if your claim is rejected.
The pattern
Denials are almost always about documentation and timing, not the product. Get the Letter of Medical Necessity before you buy, keep an itemized receipt, and be honest about the health reason — and you avoid nearly every denial.
| Reason | Why it happens | How to avoid it |
|---|---|---|
| No Letter of Medical Necessity | Buyer assumed filters are auto-eligible | Get an LMN before purchase |
| Letter dated after purchase | Bought first, documented later | Secure the letter on or before the buy date |
| No itemized receipt | Only a card statement kept | Save the receipt naming the product |
| Comfort, not health | Claimed taste/convenience as medical | Only claim a genuine, documented health need |
| Lapsed letter on replacements | Recurring filters past the 12-month window | Renew the letter; keep receipts |
A denial is not always final. First, read the reason given — it usually points to a missing document. If you have the Letter of Medical Necessity and itemized receipt, you can typically resubmit or appeal through your administrator, attaching the documentation. If the letter was missing or dated after the purchase, that specific purchase generally cannot be fixed retroactively, but you can get the documentation right for future purchases and replacements. When in doubt, call your administrator and ask exactly what they need.
SpringWell's TrueMed checkout issues the Letter of Medical Necessity at the moment of purchase, which prevents the two most common denial causes — missing or late documentation.
Shop eligible systems →It almost always names a specific missing piece.
Your Letter of Medical Necessity and itemized receipt.
Upload through the portal or follow the administrator's appeal process, attaching everything.
Confirm receipt and keep a record of the correspondence.
If the reason is unclear, the rules seem inconsistent, or a large purchase is involved, a quick call is worth it. Your administrator can tell you exactly what they need and whether a resubmission will be accepted. Because plan rules vary, their answer is more reliable than any general guide — including this one.
Almost always for documentation or timing: no Letter of Medical Necessity, a letter dated after purchase, a missing itemized receipt, or claiming a comfort purchase as medical.
Often yes, if you have the Letter of Medical Necessity and itemized receipt — resubmit or appeal with the documents. A missing or late letter usually cannot be fixed retroactively for that purchase.
Get the letter before buying, keep an itemized receipt, claim only a genuine health need, and confirm submission rules with your administrator.
