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CARC
CO-163
CARC
CO — Contractual Obligation
Documentation
Quick Facts
Code
CO-163
Type
CARC
Category
Documentation
Status
Active
Attachment/other documentation referenced on the claim was not received
What Does This Code Mean?
The claim referenced supporting documentation (e.g. operative notes) that the payer never received.
Common Causes
- Attachment not actually transmitted with the claim
- Fax/upload to the payer's system failed silently
Recommended Next Steps
- Confirm what documentation the payer expects
- Resend the attachment through the payer's preferred method and track confirmation of receipt
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Educational reference only — not medical or legal advice. Always confirm code usage and appeal rights with the specific payer.