Claim adjustment reason code
Denial code CO-107 meaning
CARC 107, usually seen as CO-107: A related or qualifying service needed for this claim was not on it, or was not found.
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- Reason code
- CARC 107
- Short name
- Related claim not found
- Plain meaning
- A related or qualifying service needed for this claim was not on it, or was not found.
- Group codes
- CO-107: 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
- An add-on or dependent service was billed without the primary service.
What to check before resubmitting
- Bill the primary service on the same claim.
- Check that the related claim was paid.
Remark codes that often come with it
Related reason codes
Related pages
Questions
What does denial code CO-107 mean?
A related or qualifying service needed for this claim was not on it, or was not found. This is Rivvi's plain-English summary of CARC 107. X12's exact wording is on x12.org.
How do I fix CO-107?
Bill the primary service on the same claim. Check that the related claim was paid.
Can I bill the patient for CO-107?
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 107?
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.