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 |
|---|---|---|
| N716 | Missing chart. | Details → |
| N717 | Incomplete/Invalid documentation of face-to-face examination. | Details → |
| N717 | Incomplete/Invalid documentation of face-to-face examination. | Details → |
| N718 | Missing documentation of face-to-face examination. | Details → |
| N718 | Missing documentation of face-to-face examination. | Details → |
| N719 | Penalty applied based on plan requirements not being met. | Details → |
| N719 | Penalty applied based on plan requirements not being met. | Details → |
| N72 | PPS (Prospective Payment System) code changed by medical reviewers. Not supported by … | Details → |
| N72 | PPS (Prospective Payment System) code changed by medical reviewers. Not supported by … | Details → |
| N720 | Alert: The patient overpaid you. You may need to issue the patient a refund for the d… | Details → |
| N720 | Alert: The patient overpaid you. You may need to issue the patient a refund for the d… | Details → |
| N721 | This service is only covered when performed as part of a clinical trial. | Details → |
| N721 | This service is only covered when performed as part of a clinical trial. | Details → |
| N722 | Patient must use Workers' Compensation Set-Aside (WCSA) funds to pay for the medical … | Details → |
| N722 | Patient must use Workers' Compensation Set-Aside (WCSA) funds to pay for the medical … | Details → |
| N723 | Patient must use Liability set-aside (LSA) funds to pay for the medical service or it… | Details → |
| N723 | Patient must use Liability set-aside (LSA) funds to pay for the medical service or it… | Details → |
| N724 | Patient must use No-Fault set-aside (NFSA) funds to pay for the medical service or it… | Details → |
| N724 | Patient must use No-Fault set-aside (NFSA) funds to pay for the medical service or it… | Details → |
| N725 | A liability insurer has reported having ongoing responsibility for medical services (… | Details → |
| N725 | A liability insurer has reported having ongoing responsibility for medical services (… | Details → |
| N726 | A conditional payment is not allowed. | Details → |
| N726 | A conditional payment is not allowed. | Details → |
| N727 | A no-fault insurer has reported having ongoing responsibility for medical services (O… | Details → |
| N727 | A no-fault insurer has reported having ongoing responsibility for medical services (O… | Details → |
| N728 | A workers' compensation insurer has reported having ongoing responsibility for medica… | Details → |
| N728 | A workers' compensation insurer has reported having ongoing responsibility for medica… | Details → |
| N729 | Missing patient medical/dental record for this service. | Details → |
| N729 | Missing patient medical/dental record for this service. | Details → |
| N73 | A Skilled Nursing Facility is responsible for payment of outside providers who furnis… | Details → |
| N73 | A Skilled Nursing Facility is responsible for payment of outside providers who furnis… | Details → |
| N730 | Incomplete/invalid patient medical/dental record for this service. | Details → |
| N730 | Incomplete/invalid patient medical/dental record for this service. | Details → |
| N731 | Incomplete/Invalid mental health assessment. | Details → |
| N731 | Incomplete/Invalid mental health assessment. | Details → |
| N732 | Services performed at an unlicensed facility are not reimbursable. | Details → |
| N732 | Services performed at an unlicensed facility are not reimbursable. | Details → |
| N733 | Regulatory surcharges are paid directly to the state. | Details → |
| N733 | Regulatory surcharges are paid directly to the state. | Details → |
| N734 | The patient is eligible for these medical services only when unable to work or perfor… | Details → |
| N734 | The patient is eligible for these medical services only when unable to work or perfor… | Details → |
| N735 | Adjustment without review of medical/dental record because the requested records were… | Details → |
| N735 | Adjustment without review of medical/dental record because the requested records were… | Details → |
| N736 | Incomplete/invalid Sleep Study Report. | Details → |
| N736 | Incomplete/invalid Sleep Study Report. | Details → |
| N737 | Missing Sleep Study Report. | Details → |
| N737 | Missing Sleep Study Report. | Details → |
| N738 | Incomplete/invalid Vein Study Report. | Details → |
| N738 | Incomplete/invalid Vein Study Report. | Details → |
| N739 | Missing Vein Study Report. | Details → |
| N739 | Missing Vein Study Report. | Details → |
| N74 | Resubmit with multiple claims, each claim covering services provided in only one cale… | Details → |
| N74 | Resubmit with multiple claims, each claim covering services provided in only one cale… | Details → |
| N740 | The member's Consumer Spending Account does not contain sufficient funds to cover the… | Details → |
| N740 | The member's Consumer Spending Account does not contain sufficient funds to cover the… | Details → |
| N741 | This is a site neutral payment. | Details → |
| N741 | This is a site neutral payment. | Details → |
| N742 | Alert: This claim was processed based on one or more ICD-9 codes. The transition to I… | Details → |
| N742 | Alert: This claim was processed based on one or more ICD-9 codes. The transition to I… | Details → |
| N743 | Adjusted because the services may be related to an employment accident. | 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.