Claim adjustment reason code
Denial code CO-B11 meaning
CARC B11, usually seen as CO-B11: The payer forwarded the claim to the proper payer or processor.
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- Reason code
- CARC B11
- Short name
- Sent to the right payer
- Plain meaning
- The payer forwarded the claim to the proper payer or processor.
- Group codes
- CO-B11: Contractual obligation. The provider absorbs the amount under its contract or the payer's rules. Do not bill the patient for it.
Plain-English summary written by Rivvi. X12 owns the CARC list and its exact wording, which is not reproduced here. Read it on the X12 CARC list (list dated November 1, 2025, checked October 23, 2026). This page does not decide how a claim is paid.
Common causes
- The claim reached the wrong payer, which sent it on.
What to check before resubmitting
- Watch for the claim at the new payer.
- Update the payer on the patient account.
Related reason codes
Related pages
Questions
What does denial code CO-B11 mean?
The payer forwarded the claim to the proper payer or processor. This is Rivvi's plain-English summary of CARC B11. X12's exact wording is on x12.org.
How do I fix CO-B11?
Watch for the claim at the new payer. Update the payer on the patient account.
Can I bill the patient for CO-B11?
With group code CO, no. CO means the provider absorbs the amount under its contract or the payer's rules.
Which group codes come with CARC B11?
Most often CO (contractual obligation). The group code, not the reason code, says who owes the amount.
What is the difference between a CARC and a RARC?
A claim adjustment reason code (CARC) says why a claim line was paid differently than billed. A remittance advice remark code (RARC) adds detail, such as which field is missing.