Instantly find explanations, causes, and resolution steps for every Claim Adjustment Reason Code (CARC) and Remark Code.
Claim Adjustment Reason Codes (CARC) explain why a payment differs from what was billed. Every 835 ERA and EOB uses these standardized codes.
Search any code or keyword above. Each page includes the full description, common causes, resolution steps, and appeal guidance.
Each denial code page also links to a dedicated Remark Code page — optimized for providers searching for ERA remark code context.
Most denials are reversible. Our guides walk you through the correct steps to correct, resubmit, or formally appeal each denial type.
| Code | Description | View |
|---|---|---|
| N69 | Alert: PPS (Prospective Payment System) code changed by claims processing system. | Details → |
| N690 | Alert: This reversal is due to a provider submitted appeal. | Details → |
| N690 | Alert: This reversal is due to a provider submitted appeal. | Details → |
| N691 | Alert: This reversal is due to a patient submitted appeal. | Details → |
| N691 | Alert: This reversal is due to a patient submitted appeal. | Details → |
| N692 | Alert: This reversal is due to an incorrect rate on the initial adjudication. | Details → |
| N692 | Alert: This reversal is due to an incorrect rate on the initial adjudication. | Details → |
| N693 | Alert: This reversal is due to a cancellation of the claim by the provider. | Details → |
| N693 | Alert: This reversal is due to a cancellation of the claim by the provider. | Details → |
| N694 | Alert: This reversal is due to a resubmission/change to the claim by the provider. | Details → |
| N694 | Alert: This reversal is due to a resubmission/change to the claim by the provider. | Details → |
| N695 | Alert: This reversal is due to incorrect patient financial responsibility information… | Details → |
| N695 | Alert: This reversal is due to incorrect patient financial responsibility information… | Details → |
| N696 | Alert: This reversal is due to a Coordination of Benefits or Third Party Liability Re… | Details → |
| N696 | Alert: This reversal is due to a Coordination of Benefits or Third Party Liability Re… | Details → |
| N697 | Alert: This reversal is due to a payer's retroactive contract incentive program adjus… | Details → |
| N697 | Alert: This reversal is due to a payer's retroactive contract incentive program adjus… | Details → |
| N698 | Alert: This reversal is due to non-payment of the health insurance premiums (Health I… | Details → |
| N698 | Alert: This reversal is due to non-payment of the health insurance premiums (Health I… | Details → |
| N699 | Payment adjusted based on the Physician Quality Reporting System (PQRS) Incentive Pro… | Details → |
| N699 | Payment adjusted based on the Physician Quality Reporting System (PQRS) Incentive Pro… | Details → |
| N7 | Alert: Processing of this claim/service has included consideration under Major Medica… | Details → |
| N7 | Alert: Processing of this claim/service has included consideration under Major Medica… | Details → |
| N70 | Consolidated billing and payment applies. | Details → |
| N70 | Consolidated billing and payment applies. | Details → |
| N700 | Payment adjusted based on the Electronic Health Records (EHR) Incentive Program. | Details → |
| N700 | Payment adjusted based on the Electronic Health Records (EHR) Incentive Program. | Details → |
| N701 | Payment adjusted based on the Value-based Payment Modifier. | Details → |
| N701 | Payment adjusted based on the Value-based Payment Modifier. | Details → |
| N702 | Decision based on review of previously adjudicated claims or for claims in process fo… | Details → |
| N702 | Decision based on review of previously adjudicated claims or for claims in process fo… | Details → |
| N703 | This service is incompatible with previously adjudicated claims or claims in process. | Details → |
| N703 | This service is incompatible with previously adjudicated claims or claims in process. | Details → |
| N704 | Alert: You may not appeal this decision but can resubmit this claim/service with corr… | Details → |
| N704 | Alert: You may not appeal this decision but can resubmit this claim/service with corr… | Details → |
| N705 | Incomplete/invalid documentation. | Details → |
| N705 | Incomplete/invalid documentation. | Details → |
| N706 | Missing documentation. | Details → |
| N706 | Missing documentation. | Details → |
| N707 | Incomplete/invalid orders. | Details → |
| N707 | Incomplete/invalid orders. | Details → |
| N708 | Missing orders. | Details → |
| N708 | Missing orders. | Details → |
| N709 | Incomplete/invalid notes. | Details → |
| N709 | Incomplete/invalid notes. | Details → |
| N71 | Your unassigned claim for a drug or biological, clinical diagnostic laboratory servic… | Details → |
| N71 | Your unassigned claim for a drug or biological, clinical diagnostic laboratory servic… | Details → |
| N710 | Missing notes. | Details → |
| N710 | Missing notes. | Details → |
| N711 | Incomplete/invalid summary. | Details → |
| N711 | Incomplete/invalid summary. | Details → |
| N712 | Missing summary. | Details → |
| N712 | Missing summary. | Details → |
| N713 | Incomplete/invalid report. | Details → |
| N713 | Incomplete/invalid report. | Details → |
| N714 | Missing report. | Details → |
| N714 | Missing report. | Details → |
| N715 | Incomplete/invalid chart. | Details → |
| N715 | Incomplete/invalid chart. | Details → |
| N716 | Missing chart. | Details → |
Medical claim denial codes — formally known as Claim Adjustment Reason Codes (CARC) — are standardized identifiers maintained by the X12 standards body and used across all Medicare, Medicaid, and commercial payer 835 electronic remittance transactions. When a claim is paid at a different amount than billed, at least one CARC code must accompany the remittance advice to indicate the specific reason for the adjustment.
The most frequently encountered codes include CO-16 (missing or invalid claim information), CO-45 (charges exceeding fee schedule), PR-1 (patient deductible), CO-29 (timely filing deadline exceeded), and CO-4 (procedure code inconsistent with modifier). Each represents a distinct, actionable reason that has a defined resolution pathway.