Claim adjustment reason code
Denial code CO-199 meaning
CARC 199, usually seen as CO-199: The revenue code and the procedure code on the line do not go together.
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- Reason code
- CARC 199
- Short name
- Revenue code and procedure code do not match
- Plain meaning
- The revenue code and the procedure code on the line do not go together.
- Group codes
- CO-199: 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
- A HCPCS code was billed under a revenue code that does not fit it.
What to check before resubmitting
- Check the revenue code and HCPCS pairing in the payer's rules.
Related reason codes
Related pages
Questions
What does denial code CO-199 mean?
The revenue code and the procedure code on the line do not go together. This is Rivvi's plain-English summary of CARC 199. X12's exact wording is on x12.org.
How do I fix CO-199?
Check the revenue code and HCPCS pairing in the payer's rules.
Can I bill the patient for CO-199?
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 199?
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.