Claim adjustment reason code
Denial code CO-275 meaning
CARC 275, usually seen as CO-275: This payer does not cover the patient share left by the prior payer.
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- Reason code
- CARC 275
- Short name
- Prior payer's patient share not covered
- Plain meaning
- This payer does not cover the patient share left by the prior payer.
- Group codes
- CO-275: 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 secondary plan does not pick up the primary plan's deductible, coinsurance or copay.
What to check before resubmitting
- Bill the patient for the remaining share, as allowed.
Related reason codes
Related pages
Questions
What does denial code CO-275 mean?
This payer does not cover the patient share left by the prior payer. This is Rivvi's plain-English summary of CARC 275. X12's exact wording is on x12.org.
How do I fix CO-275?
Bill the patient for the remaining share, as allowed.
Can I bill the patient for CO-275?
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 275?
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.