CO-197: Precertification/Authorization/Notification Absent
Prior authorization was required and not obtained. The provider absorbs the denial. Search for an existing auth number for reprocessing, pursue retro auth, or appeal with medical necessity documentation.
What Does CO-197 Mean?
CO-197 is the standard pairing for this denial and means the provider's contractual obligation to obtain prior authorization was not met. The payer denies the claim as a contractual adjustment — the provider cannot bill the patient for the denied amount. This is the provider's financial responsibility to resolve through reprocessing, retro authorization, or appeal.
CARC 197 is one of the most common and costly authorization-related denials in medical billing. It fires when the payer determines that a required precertification, prior authorization, notification, or pre-treatment step was absent at the time the service was delivered. The claim is denied not because the service was clinically inappropriate, but because the administrative prerequisite was not completed.
The most frequent scenario is straightforward: the provider rendered a service that requires prior authorization under the payer's policy, and no authorization was obtained. But CARC 197 also fires in more subtle situations — an authorization was obtained but the authorization number was left off the claim, the dates of service fall outside the authorization window, the CPT codes billed do not match the approved procedure, or the units delivered exceed what was authorized. In each case, the payer's system sees no valid authorization attached to the claim.
Under CO (the dominant group code), the provider absorbs the denial because the contractual obligation to obtain authorization fell on the practice. The provider cannot bill the patient for the denied amount. Under PR, which is less common, the patient was responsible for obtaining a referral under their plan (e.g., HMO requiring PCP referral to specialist) and failed to do so. The financial impact of CARC 197 denials is significant — these are often fully denied claims, not partial adjustments — making prevention through robust authorization workflows critical.
Common Causes
| Cause | Frequency |
|---|---|
| Authorization request never created The provider failed to submit a prior authorization request before rendering the service, either due to workflow gaps or unawareness that the specific service required authorization | Most Common |
| Notification window missed The provider did not notify the payer within the required timeframe before or after the service was delivered, missing the payer's notification deadline | Most Common |
| Authorization obtained but not referenced on claim A valid authorization was obtained but the authorization number was omitted from the claim submission, causing the payer to process the claim as if no authorization existed | Common |
| Claim data does not match approved authorization scope An authorization exists but the claim's dates of service, CPT/HCPCS codes, site of service, or number of units do not match what was approved in the authorization | Common |
| Pre-treatment requirements not fulfilled The payer required specific pre-treatment documentation or steps (such as face-to-face encounters for DME) that were not completed before the service was rendered | Common |
| Unawareness of payer-specific authorization requirements The provider was not aware that the specific payer requires authorization for the particular service or procedure, especially when requirements vary between payers | Occasional |
How to Resolve
Search for an existing authorization, request reprocessing or retroactive auth, and appeal if necessary.
- Search for the authorization number Check your auth tracking system, the payer portal, and any clinical staff notes. The most common quick fix is finding an auth that was obtained but not attached to the claim.
- Request claim reprocessing with the auth If you locate the authorization, call the claims department, provide the auth number, and request reprocessing. Some payers allow this via their portal without a phone call.
- Submit retro authorization if allowed Check the payer's retro auth policy and submit a request with supporting clinical documentation. Act quickly — retro auth windows are typically 14 to 30 days from the date of service.
- Appeal with medical necessity evidence If retro auth is denied, file a formal appeal including the complete medical record, a letter explaining why the service was necessary, and any supporting clinical guidelines or peer-reviewed references.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-197:
| RARC | Description |
|---|---|
| N130 | Consult plan benefit documents/guidelines for coverage requirements. Used when the payer directs the provider to review their specific authorization policies. |
| N41 | Authorization request denied. The prior authorization application was rejected, often due to incomplete documentation or missing supporting records. |
| N386 | This decision was based on a National Coverage Determination (NCD) or Local Coverage Determination (LCD). Used when the authorization requirement stems from a coverage policy. |
How to Prevent CO-197
- Implement automated prior authorization verification at the point of scheduling — flag any service that requires auth before the appointment is confirmed
- Maintain an up-to-date database of payer-specific authorization requirements by CPT code, service type, and place of service
- Make the authorization number a required field in your claim submission workflow so claims cannot be sent without it
- Conduct monthly audits of CARC 197 denials to identify patterns by payer, provider, or service type and address systemic gaps
- Submit PA requests at least 7 calendar days before the service date (standard) or 2 business days (expedited) to allow processing time
- Train all scheduling, clinical, and billing staff on which services require prior authorization for each major payer contract
General Prevention
- Implement automated prior authorization verification at scheduling and before service delivery using payer portal integrations
- Maintain an up-to-date database of payer-specific authorization requirements by CPT code and service type
- Check CMS's Required Prior Authorization Lists annually and update internal workflows accordingly
- Submit PA requests at least 7 calendar days before service (standard) or 2 business days (expedited) to allow processing time
- Include authorization number verification as a required field in the claim submission workflow to prevent omission
- Conduct monthly audits of CARC 197 denials to identify patterns by payer, service type, or staff member
- Train all scheduling and front-desk staff on which services require prior authorization for each major payer
Also Filed As
The same CARC 197 may appear with different Group Codes: