Claim Adjustment Code Guide
CO-197 means the payer says required precertification, authorization, or notification was missing. The CO prefix matters because it can indicate a contractual obligation between the payer and provider rather than automatic patient responsibility.
Standard Definition
Precertification/authorization/notification/precertification absent.
Financial Liability
For many in-network claims, CO-197 points to an authorization workflow failure by the participating provider or facility. The patient should compare the EOB patient-responsibility column with any provider bill and challenge attempts to collect a contractual denial from the member.
Out-of-network claims may be handled differently, and similar authorization denials can appear with patient-responsibility language. If the EOB assigns the balance to the patient, the appeal should address network status, emergency exceptions, and retrospective medical necessity.
Administrative Defenses
A strong CO-197 response checks the billing liability first, then documents the authorization exception or retrospective clinical basis.
Verify whether the provider was in-network and whether the EOB lists the denial as CO-197. If the provider attempts to bill the member anyway, the appeal should dispute the balance as a provider-side authorization failure.
If the service followed an emergency presentation, prior authorization requirements may not apply the same way. The appeal should document triage notes, admission path, presenting symptoms, and urgent clinical facts.
When the authorization issue cannot be resolved administratively, the appeal should show that the service would have met medical necessity standards if reviewed before care occurred.
Action Protocol
Challenging this specific ANSI code requires precise legal and provider checks. Compare the manual steps required to resolve this code yourself versus utilizing Remedy Support as your administrative surrogate.
You must review your EOB and verify whether the denial is listed as CO-197 or PR-197. You must also check whether the patient-responsibility column shows $0.00 or assigns a balance to you.
Our system checks the EOB prefix. If the carrier used 'CO', we flag it as a signal that responsibility for the missing authorization may sit with the provider or the plan rather than with you.
If an in-network provider bills you for a CO-197 denial, you must call their billing office to dispute the charge and manually draft a complaint referencing their participating provider agreement.
We draft a written dispute to the provider's billing office referencing the EOB, the participating provider agreement, and a request to pause collection while the dispute is reviewed.
If the care was emergent, you must contact the hospital, request your emergency room triage notes, and manually isolate your presenting symptoms and vitals to support an emergency-care exception.
We organize your emergency admission records and structure a request for reconsideration under the applicable emergency-care, notification, or retrospective-review rules for your plan.
You must compile the EOB, denial notice, provider bill, clinical records, authorization history, HIPAA authorization, and representative forms into one complete appeal packet and submit it via standard mail.
We compile your retrospective filing, including the authorization materials required for your plan when available, and route the packet through an accepted carrier channel to the prior authorization review unit.
EOB Notes
CO-197 Appeal Help
Our system organizes your EOB, provider bill, authorization details, emergency or clinical records, HIPAA authorization, and representative forms into a carrier-ready CO-197 appeal packet for a flat $49 fee.
Start My AppealThis guide provides general administrative information for health insurance appeals and EOB review. It is not legal or medical advice, and liability rules can vary by plan, provider contract, waiver language, state, and service type.