How do I resolve a CO-197 denial?

Verify authorization requirements and status in payer system: Check if authorization was actually obtained but not referenced on the claim, or if the service type genuinely required prior authorization under the contract terms Request retroactive authorization if clinically appropriate: If services were medically necessary and authorization was inadvertently missed, submit a retroactive authorization request with supporting clinical documentation explaining the urgency or administrative oversight File a formal appeal with authorization evidence: Submit appeal with authorization approval documentation, payer correspondence showing authorization was not required, or retroactive authorization approval if obtained, citing specific contract language regarding authorization requirements

835 Denial Combination

CO-197

Contractual Obligation · Claim-Level Adjustment

Authorization

What This Combination Means

The claim was denied because required precertification, authorization, notification, or pre-treatment approval was not obtained before services were rendered. Because this is a CO adjustment, the provider is contractually obligated to write off the denied amount and cannot balance bill the patient, even though the authorization failure may have originated with the provider's administrative processes.

Financial Responsibility

provider writeoff

The provider must absorb the full denied amount as a contractual write-off. The patient has no financial liability for this adjustment under the provider's contract with the payer.

48%

Appeal Success

30-60 days (appeal process)

Avg. Resolution

Hard

Difficulty

Yes

Appealable

Step-by-Step Resolution

Steps tailored specifically to this CO-197 combination — not generic advice.

Appealable:Authorization-related denials are appealable if the provider can demonstrate that authorization was obtained, was not required for the service rendered, or meets criteria for retroactive authorization per payer policy.

1
Verify authorization requirements and status in payer system
Check if authorization was actually obtained but not referenced on the claim, or if the service type genuinely required prior authorization under the contract terms
2
Request retroactive authorization if clinically appropriate
If services were medically necessary and authorization was inadvertently missed, submit a retroactive authorization request with supporting clinical documentation explaining the urgency or administrative oversight
3
File a formal appeal with authorization evidence
Submit appeal with authorization approval documentation, payer correspondence showing authorization was not required, or retroactive authorization approval if obtained, citing specific contract language regarding authorization requirements

Specialty Context

How CO-197 typically presents across different practice types.

Dental

Common for oral surgery, orthodontics, and major restorative procedures that require predetermination or prior authorization; verify pre-treatment estimates were submitted and approved before service delivery

Medical

Frequently seen for surgeries, high-cost imaging, durable medical equipment, specialty referrals, and inpatient admissions that require precertification; authorization tracking systems are critical to prevent these denials

Behavioral Health

Common for intensive outpatient programs, residential treatment, psychological testing, and extended therapy sessions beyond plan limits; authorization lapses can occur when treatment extends beyond initially approved visit counts

Individual Code References

View the standalone definition for each code in this combination.

CARC 197

Medicare Contractor Guidance for CARC 197

Noridian + uhc + aetna + bcbs_az

Prior authorization 14-byte Unique Tracking Number (UTN) was not appended to claim Special modifier to bypass the prior authorization process was not appended to claim line. This HCPCS code requires prior authorization

How to Prevent CARC 197 Denials

✓
Obtain prior authorization for item, prior to delivery
✓
Ensure to append 14-byte UTN provided within the affirmative decision letter to the claim
✓
If prior authorization is being bypassed, ensure the special modifiers required are appended to the claim line

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Synthesized from official definitions — not from training data

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