Claim adjustment reason code
Denial code CO-34 meaning
CARC 34, usually seen as CO-34: The subscriber's plan does not cover the newborn, or the newborn was not added.
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- Reason code
- CARC 34
- Short name
- No newborn coverage
- Plain meaning
- The subscriber's plan does not cover the newborn, or the newborn was not added.
- Group codes
- CO-34: 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 newborn was not enrolled within the plan's deadline.
What to check before resubmitting
- Check whether the newborn has been added to the policy.
- Bill under the newborn's own ID once assigned.
Related reason codes
Related pages
Questions
What does denial code CO-34 mean?
The subscriber's plan does not cover the newborn, or the newborn was not added. This is Rivvi's plain-English summary of CARC 34. X12's exact wording is on x12.org.
How do I fix CO-34?
Check whether the newborn has been added to the policy. Bill under the newborn's own ID once assigned.
Can I bill the patient for CO-34?
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 34?
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.