CO-224: Patient Identity Compromised
The claim is frozen due to identity theft concerns. Verify the patient's identity, work with the payer's fraud unit, and resubmit when the hold is cleared. Do not bill the patient.
What Does CO-224 Mean?
CO-224 is the standard pairing for this code. The payer has frozen the claim pending identity verification, and the adjustment is treated as a contractual hold. The provider cannot bill the patient while the identity investigation is active — the claim is essentially in limbo until the payer's fraud unit resolves the issue. Once identity is verified and the hold is lifted, the claim should be resubmitted for normal processing.
CARC 224 is a fraud-prevention hold — the payer has determined or suspects that the patient's identity has been compromised through identity theft, and all claims under that identity are frozen until verification is completed. This is not a clinical denial, a coding error, or a coverage issue. It is a security measure designed to prevent fraudulent claims from being paid.
When you receive CARC 224, the patient's account has been flagged in the payer's system. This may have been triggered by the patient reporting identity theft, the payer detecting suspicious claims patterns, a data breach affecting patient records, or demographic mismatches between your claim submission and the payer's records. The flag applies not just to the current claim but to all future claims until the identity is re-verified.
Resolution requires direct coordination between three parties: the provider, the patient, and the payer's fraud or special investigations unit. The provider's role is to verify the patient's identity at the practice level (government-issued ID, insurance card verification), assist the patient in reporting the theft if confirmed, and then work with the payer to clear the hold. This process can take weeks depending on the complexity of the investigation. Do not bill the patient for these claims while the identity hold is active — the charges remain in a holding status until the payer can confirm the legitimacy of the claims.
Common Causes
| Cause | Frequency |
|---|---|
| Known identity theft on the patient's account The payer has flagged the patient's account for confirmed or suspected identity theft, requiring additional verification before any claims can be processed under that identity | Most Common |
| Mismatched patient demographics The patient information submitted on the claim (name, date of birth, SSN, member ID) does not match the payer's records, triggering an identity fraud alert | Most Common |
| Previous fraudulent claims filed under the patient's identity The payer detected previous claims submitted fraudulently using the patient's stolen identity, placing a hold on all future claims until verification is completed | Common |
| Data breach affecting patient records A data breach at the payer, provider, or third party exposed the patient's information, prompting the payer to flag the account and require identity re-verification | Common |
| Patient reported identity theft to payer The patient directly notified the payer that their insurance identity has been compromised, triggering an account freeze and verification requirement for all claims | Occasional |
How to Resolve
Verify the patient's identity at your practice, coordinate with the payer's fraud unit to clear the identity hold, then resubmit the claim.
- Verify identity at the practice Confirm the patient's identity using government-issued photo ID and cross-reference against your records. Document the verification with copies of the identification used.
- Coordinate with the fraud unit Contact the payer's special investigations unit, report your identity verification findings, and submit all required documentation. Obtain a case number for tracking.
- Resubmit after clearance Once the payer confirms the hold is removed, resubmit the claim referencing the fraud unit case number. Monitor for proper processing and payment.
- Correct demographics if mismatch was the issue If the flag was triggered by a demographic mismatch rather than actual theft, update the patient's demographics with the payer and resubmit with corrected information.
This is a standard contractual adjustment. The amount is a provider write-off per your payer contract and cannot be billed to the patient.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-224:
| RARC | Description |
|---|---|
| N572 | Alert: Patient identity verification is required. Contact the payer for specific verification requirements. |
| N479 | Alert: Claim processing is pending identity verification. Provide required documentation to proceed. |
How to Prevent CO-224
- Verify patient identity using photo ID at every visit, not just the first
- Use real-time eligibility checks to detect demographic discrepancies before claim submission
- Maintain HIPAA-compliant data security practices to prevent patient data breaches at your practice
- Train registration staff to recognize identity theft red flags such as mismatched names, addresses, or insurance information
General Prevention
- Implement robust patient identification protocols at registration including checking government-issued photo ID and insurance card at every visit
- Verify patient identity using multiple data points (full name, date of birth, address, member ID) before submitting claims
- Use real-time eligibility verification to detect discrepancies in patient demographics before claim submission
- Train front desk and registration staff to recognize red flags for identity theft such as mismatched names, addresses, or insurance information
- Maintain secure handling of patient personal health information (PHI) in compliance with HIPAA to prevent data breaches
- Implement fraud detection software that flags suspicious claim patterns before submission
Also Filed As
The same CARC 224 may appear with different Group Codes:
Related Denial Codes
Sources
- https://www.mdclarity.com/denial-code/224
- https://x12.org/codes/claim-adjustment-reason-codes
- https://textexpander.com/blog/denial-codes-medical-billing-guide
- Codes maintained by X12. Visit x12.org for official definitions.