What if the carrier says they never got my fax?

By Mohamed Younis, Operations, Apellica. Last reviewed 2026-05-22.

If you have a transmission receipt showing the carrier's fax number answered and accepted the call, the law treats the appeal as delivered. Send the receipt to the carrier in writing, demand acknowledgment within 5 business days, and copy your state insurance commissioner. If the carrier still denies receipt, the transmission receipt is sufficient evidence for an external review filing.

Carriers occasionally claim they never received an appeal even when the transmission receipt clearly shows delivery to their published fax number. This is sometimes an honest internal routing error inside the carrier and sometimes a deliberate stalling tactic. Either way, the resolution path is the same: produce the proof, escalate quickly, and do not let the deadline run while the carrier investigates.

Start with the receipt itself. A valid fax transmission receipt shows: the destination number, the date and time the transmission completed, the number of pages sent, and a result code (almost always 'OK' or 'Success'). If your receipt has all four, you have legally sufficient proof of delivery under most state evidence codes and under the federal best-evidence rule applied in ERISA appeals.

Send a follow-up letter (yes, also by fax, and also by certified mail) within 7 days of the carrier's no-receipt claim. Include: a copy of your original transmission receipt, a copy of the original appeal cover sheet, and one paragraph that states, in plain language, that the document was received by the carrier's fax line on a specific date and time and that the appeal deadline should be measured from that date. Demand written acknowledgment within 5 business days.

Simultaneously, file a complaint with your state department of insurance. Every state DOI has a consumer-complaint form, most of them online. The complaint does not need to be confrontational; it just needs to be filed. The DOI complaint creates an external record that the carrier was put on notice. State DOIs send carriers requests for response, typically within 10 to 15 business days, and the carrier's reply becomes part of your appeal record.

If the appeal is ERISA-governed (any self-funded employer plan), the 29 CFR 2560.503-1(l) deemed-exhaustion provision is your friend. If the carrier fails to follow the appeal process meaningfully, the regulation treats the internal appeal as exhausted and you can move directly to external review or federal court. A documented no-response after a documented fax delivery is a textbook 503-1(l) trigger.

Finally, do not let the carrier's no-receipt claim eat your external-review window. Most states give you 4 months after internal appeal exhaustion to request external review. If the carrier is dragging out the internal appeal by claiming non-receipt, file the external review anyway with the transmission receipt as proof of internal-appeal filing.

Checklist before you send a fax appeal

Save the original transmission receipt as a PDF.
Refax the appeal with a cover note referencing the prior transmission receipt.
Also send certified mail with USPS Return Receipt.
File a state DOI complaint within 7 days.
If ERISA, prepare a 29 CFR 2560.503-1(l) deemed-exhaustion notice.
Calendar the external-review deadline regardless of internal-appeal status.

If reading this is already too much: Apellica handles fax-and-everything-else appeals end to end. let Apellica drive the escalation.