Claim adjustment reason code
Denial code CO-59 meaning
CARC 59, usually seen as CO-59: Payment was cut because of the payer's multiple procedure or concurrent care rules.
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- Reason code
- CARC 59
- Short name
- Multiple or concurrent procedure reduction
- Plain meaning
- Payment was cut because of the payer's multiple procedure or concurrent care rules.
- Group codes
- CO-59: 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
- More than one procedure was done in the same session, and the payer pays the second and later ones at a reduced rate.
What to check before resubmitting
- Check that the highest-paying procedure is on the first line.
- Confirm the reduction matches the payer's multiple procedure policy.
Related reason codes
Related pages
Questions
What does denial code CO-59 mean?
Payment was cut because of the payer's multiple procedure or concurrent care rules. This is Rivvi's plain-English summary of CARC 59. X12's exact wording is on x12.org.
How do I fix CO-59?
Check that the highest-paying procedure is on the first line. Confirm the reduction matches the payer's multiple procedure policy.
Can I bill the patient for CO-59?
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 59?
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.