Denial code · Contractual Obligation (CO)
CO-252 denial code
The payer needs a paper or file attached before it can decide the claim.
What the code means
Official meaning: An attachment/other documentation is required to adjudicate this claim/service. At least one Remark Code must be provided (may be comprised of either the NCPDP Reject Reason Code, or Remittance Advice Remark Code that is not an ALERT.)
In plain words: The payer needs a paper or file attached before it can decide the claim.
The usual fix
Read the note codes to see what to attach, attach that file, and send the claim again.
This is general information, not advice on a specific claim.
Learn on the job
Learn on the job with real denied claims.
Working denied claims is the medical claims desk's daily work. Read a code, find what is missing, fix the claim, or write the appeal.