Denial Code Hub
Search CO, PR, OA, PI, RARC, and MA code entries with plain-English definitions, root causes, step-by-step resolution guidance, appeal resources, and practical examples.
Showing 2422 of 2422 codes
CO — Contractual Obligation
252 codesCARC — Reason Code Reference
297 codesPR — Patient Responsibility
245 codesOA — Other Adjustment
246 codesPI — Payer Initiated
245 codesRARC — Remark Codes
1027 codesMA — Medicare Remark Codes
110 codesMost Common Denial Codes — Full Deep Dives
Claim/service lacks information or has submission/billing error(s). Usage: Do not use this code for claims attachment(s)/other documentation. At least one Remark Code must be provided (may be comprised of either the NCPDP Reject Reason Code, or Remittance Advice Remark Code that is not an ALERT.) Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
Full Guide CO-45Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement. Usage: This adjustment amount cannot equal the total service or claim charge amount; and must not duplicate provider adjustment amounts (payments and contractual reductions) that have resulted from prior payer(s) adjudication. (Use only with Group Codes PR or CO depending upon liability)
Full Guide CO-50These are non-covered services because this is not deemed a 'medical necessity' by the payer. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
Full Guide CO-97The benefit for this service is included in the payment/allowance for another service/procedure that has already been adjudicated. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
Full Guide CO-197Precertification/authorization/notification/pre-treatment absent.
Full Guide CO-29The time limit for filing has expired.
Full Guide CO-151Payment adjusted because the payer deems the information submitted does not support this many/frequency of services.
Full Guide CO-18Exact duplicate claim/service (Use only with Group Code OA except where state workers' compensation regulations requires CO)
Full Guide CO-22This care may be covered by another payer per coordination of benefits.
Full Guide PR-1Deductible Amount
Full Guide PR-3Co-payment Amount
Full Guide OA-18Exact duplicate claim/service (Use only with Group Code OA except where state workers' compensation regulations requires CO)
Full Guide OA-23The impact of prior payer(s) adjudication including payments and/or adjustments. (Use only with Group Code OA)
Full Guide CO-4The procedure code is inconsistent with the modifier used. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
Full Guide CO-11The diagnosis is inconsistent with the procedure. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.
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