Official CARC description: “An attachment/other documentation is required to adjudicate this claim/service.” Here’s what it actually means, why it fires, and how to get the claim paid.
The payer won't decide without paperwork — records, invoices, or certificates. Not a denial on the merits; the claim is parked until you supply the documents.
Liability group: CO = Contractual Obligation — the provider absorbs it — the amount cannot be billed to the patient. If the denial is wrong, the money is recovered by correcting or appealing the claim, not by balance-billing.
Read the RARC to identify the exact document requested
Send it through the payer's designated channel (portal upload beats fax) with the claim number on every page
Calendar the follow-up — payers routinely “lose” these after 45–60 days of silence
For repeat offenders, attach the documentation proactively at first submission
Not an appeal — a document delivery. It becomes an appeal only if the payer denies after receiving records; then appeal on the merits with a point-by-point rebuttal.
Fill in the denial facts — use placeholders, never real patient data (the letter keeps [PATIENT NAME]-style fields so you can merge real details privately). A payer-ready draft with an enclosure checklist comes back in ~20 seconds.
Your appeal letter draft will appear here.
An attachment/other documentation is required to adjudicate this claim/service. In practice: The payer won't decide without paperwork — records, invoices, or certificates. Not a denial on the merits; the claim is parked until you supply the documents.
CO stands for Contractual Obligation — the provider absorbs it — the amount cannot be billed to the patient. If the denial is wrong, the money is recovered by correcting or appealing the claim, not by balance-billing.
Not an appeal — a document delivery. It becomes an appeal only if the payer denies after receiving records; then appeal on the merits with a point-by-point rebuttal.