Claim adjustment reason code
Denial code CO-234 meaning
CARC 234, usually seen as CO-234: This procedure is not paid on its own.
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- Reason code
- CARC 234
- Short name
- Not paid separately
- Plain meaning
- This procedure is not paid on its own.
- Group codes
- CO-234: 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 code is bundled into other services by payer policy.
- The code is a status code the payer never pays separately.
What to check before resubmitting
- Check the code's status in the Medicare Physician Fee Schedule.
- Do not bill the patient when the group code is CO.
Remark codes that often come with it
Related reason codes
Related pages
Questions
What does denial code CO-234 mean?
This procedure is not paid on its own. This is Rivvi's plain-English summary of CARC 234. X12's exact wording is on x12.org.
How do I fix CO-234?
Check the code's status in the Medicare Physician Fee Schedule. Do not bill the patient when the group code is CO.
Can I bill the patient for CO-234?
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 234?
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.