What CO-252 means
The payer needs documentation, such as records or an invoice, to decide the claim.
The CO group code means this amount is a contractual obligation: under most contracts you cannot bill it to the patient.
Common causes
- Claim submitted without required attachments
How to fix it
- Send the documentation using the payer's attachment process
- Note the claim number and follow up
Check the remark code (RARC) that came with the denial and the payer's own policy, since rules vary by payer and plan. This is a plain-English summary written by GetMax; the official code text is published by X12 at x12.org/codes.
Prevent it next time
Most denials are caused before the claim is sent. See 12 ways to reduce claim denials, or let our denial management team work them for you.
Other codes
- CO-236 · Procedure combination not compatible on the same day (NCCI)
- CO-242 · Services not provided by network or primary care providers
- CO-B7 · Provider not certified or eligible to be paid on this date of service
- CO-B15 · Requires a qualifying service that was not received or covered