How do I fix or resolve code CO-197?

Check the practice management system and payer portal to determine whether a prior authorization was obtained for this service and date of service; if it was, verify the authorization number was entered on the claim. If no authorization was obtained, contact the payer immediately to request retro-authorization; some payers allow retro-authorization within a limited window (typically 14–30 days) if the service was medically necessary. If retro-authorization is denied, file a formal appeal with a letter of medical necessity, the clinical documentation supporting the service, and an explanation of the administrative error that caused the missing authorization. If the authorization was obtained but not linked to the claim, resubmit the corrected claim with the authorization number in the appropriate 837 loop (2300 REF*G1 for institutional, 2300/2400 REF*G1 for professional). If the payer will not overturn the denial, write off the balance as a provider write-off (if in-network) or bill the patient (if out-of-network and permitted by the plan).

CO-197Denial CodeContractual Obligation

Code CO-197

Problem Description

Precertification/authorization/notification/pre-treatment absent.

Root Cause

The claim was denied because precertification, authorization, notification, or pre-treatment was absent. The payer requires prior authorization for certain services (e.g., advanced imaging, surgeries, specialty drugs, durable medical equipment) and the claim was submitted without evidence that authorization was obtained. This is one of the most preventable denials — it occurs when the front office or clinical staff fails to initiate the authorization process before the service is rendered, or the authorization was obtained but not linked to the claim.

Resolution Steps

1Check the practice management system and payer portal to determine whether a prior authorization was obtained for this service and date of service; if it was, verify the authorization number was entered on the claim.
2If no authorization was obtained, contact the payer immediately to request retro-authorization; some payers allow retro-authorization within a limited window (typically 14–30 days) if the service was medically necessary.
3If retro-authorization is denied, file a formal appeal with a letter of medical necessity, the clinical documentation supporting the service, and an explanation of the administrative error that caused the missing authorization.
4If the authorization was obtained but not linked to the claim, resubmit the corrected claim with the authorization number in the appropriate 837 loop (2300 REF*G1 for institutional, 2300/2400 REF*G1 for professional).
5If the payer will not overturn the denial, write off the balance as a provider write-off (if in-network) or bill the patient (if out-of-network and permitted by the plan).

EHR Documentation Note

Claim denied CO-197 — prior authorization absent; verified authorization status, requested retro-auth if applicable, or appealed with medical necessity documentation.

Preventative Action

Maintain a payer-specific prior authorization list in the practice management system with automated alerts for services requiring authorization, and require front-office staff to confirm authorization before scheduling any procedure.

Related Codes in Contractual Obligation

CO-4

The 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.

CO-5

The procedure code/type of bill is inconsistent with the place of service. Usage: Refer to the 835 Healthcare Policy Identification Segment (loop 2110 Service Payment Information REF), if present.

CO-16

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.

CO-18

Exact duplicate claim/service (Use only with Group Code OA except where state workers' compensation regulations requires CO)

This directory provides reference information only and does not constitute official legal, medical, or financial billing advice. Always consult the payer's official remittance advice and current coding guidelines.