CARC 19 Active

CO-19: Workers' Compensation Claim

TL;DR

Provider responsibility — correct and resubmit to the appropriate payer. The patient is not liable for this amount.

Action
Resubmit
Who Pays
Provider
Appeal
Yes
Patient Impact
None
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does CO-19 Mean?

With CO (Contractual Obligation), the CARC 19 adjustment for workers' compensation claim indicates the claim needs to be corrected or routed to a different payer. The patient is not liable for this amount. Correct the issue and resubmit.

CARC 19 indicates workers' compensation claim. The payer determined that the service or a portion of it does not meet coverage criteria under the patient's current plan benefits or the applicable coverage rules.

Common scenarios that trigger this adjustment include: claim for a work-related injury or illness was submitted to the patient's health insurance instead of the workers' compensation carrier; The payer's system flagged the diagnosis codes as work-related based on injury type or circumstance codes; The health plan determined another carrier (workers' comp) has primary liability for the services. The group code paired with CARC 19 determines who bears the financial responsibility — CO places it on the provider as a contractual obligation, OA indicates a coordination of benefits or other payer adjustment, PR shifts it to the patient.

Common Causes

Cause Frequency
Work-related injury billed to health plan Claim for a work-related injury or illness was submitted to the patient's health insurance instead of the workers' compensation carrier Most Common
Payer identified work-related diagnosis The payer's system flagged the diagnosis codes as work-related based on injury type or circumstance codes Common
Coordination with workers' comp The health plan determined another carrier (workers' comp) has primary liability for the services Common

How to Resolve

  1. Review the denial reason Examine the CO-19 adjustment and any RARC codes to identify what needs to be corrected.
  2. Correct the claim Address the issue that triggered the denial — update the claim with correct information or route to the appropriate payer.
  3. Resubmit the claim Submit the corrected claim per the payer's guidelines.
Appeal Guide

If the injury/illness is not work-related, appeal with documentation including patient statement, employer letter, and medical records showing the condition is unrelated to employment. If it is work-related, submit to the workers' compensation carrier instead of appealing.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-19:

RARC Description
N36 Claim must meet primary payer requirements before secondary payment Submit to workers' compensation carrier first →
N479 Missing/incomplete/invalid condition information Provide documentation of non-work-related condition if appealing →

How to Prevent CO-19

Also Filed As

The same CARC 19 may appear with different Group Codes:

OA-19 PR-19

Related Denial Codes

CO-20 — Liability Carrier Responsible CO-21 — No-Fault Carrier Responsible CO-22 — Coordination of Benefits - Another Payer May Cover CO-276 — Prior Payer Denied Services Not Covered by This Payer CO-226 — Provider Information Not Provided or Insufficient

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://revenuecyclemgmt.com/claim-adjustment-reason-codes/
  3. https://www.rivethealth.com/blog/carcs-rarcs-claim-adjustment-remittance-advice-codes
  4. Codes maintained by X12. Visit x12.org for official definitions.