Denial Code CO-252: Description, Meaning and How to Fix It
The payer needs supporting documentation before it can process the claim.
Official description
An attachment/other documentation is required to adjudicate this claim/service.
Common cause
Required records (notes, reports, itemized bill) were not submitted.
How to fix it
Submit the requested documentation via the payer's preferred method and resubmit or respond to the request.
Related denial codes
- CO-16: The claim is missing required information or has an error. It is almost always paired with a RARC that names the specific missing field.
- CO-97-N290: The rendering provider's NPI is missing, incomplete, or invalid on the claim.
- MA130: The claim is unprocessable due to incomplete/invalid information, so it was not adjudicated (and has no appeal rights until corrected).
- CO-45: The amount billed is higher than the payer's contracted (allowed) rate. The difference is a contractual write-off, not a patient balance.
- CO-97: This service is bundled into another service that was already paid, so it is not paid separately.
- CO-18: The payer received this exact claim/service already.