CO-B15: Qualifying Service/Procedure Not Received or Covered
CO-B15 means the required qualifying service was not completed or adjudicated. Verify it was done, confirm adjudication, and resubmit.
What Does CO-B15 Mean?
When paired with Group Code CO, the qualifying service requirement is contractual. The provider must ensure the prerequisite was met before billing the dependent service. The denied amount cannot be collected from the patient.
CARC B15 indicates the payer denied the claim because a required prerequisite service was not completed, not adjudicated, or not covered before the current service was performed. Many procedures and services require a qualifying prior step — such as a screening before a diagnostic test, an initial evaluation before a treatment series, a diagnostic test before a procedure, or a conservative treatment trial before surgery (step therapy).
The denial may occur because the qualifying service was never performed, it was performed but not yet processed by the payer, it was denied by the payer, step therapy requirements were not followed, or documentation of the qualifying service was not submitted.
Resolution typically involves locating evidence that the qualifying service was completed, ensuring it has been adjudicated by the payer, and resubmitting the dependent service claim. If the qualifying service was performed by another provider, obtaining records from that provider may be necessary.
Common Causes
| Cause | Frequency |
|---|---|
| Qualifying service not performed The billed service requires a qualifying prerequisite service (e.g., screening, initial evaluation, diagnostic test) that was never performed | Most Common |
| Qualifying service not yet adjudicated The prerequisite service was performed but has not been adjudicated by the payer, so coverage for the dependent service cannot be confirmed | Most Common |
| Qualifying service denied by payer The prerequisite service was performed but was denied by the payer, making the dependent service ineligible for coverage | Common |
| Step therapy requirement not met The payer requires a step therapy progression (e.g., trying conservative treatment before surgery) and the qualifying steps were not completed | Common |
| Missing documentation of qualifying service The qualifying service was performed but documentation was not submitted to the payer to establish eligibility for the current service | Common |
How to Resolve
- Identify the prerequisite Determine what qualifying service was required.
- Verify completion Confirm the qualifying service was performed and documented.
- Check adjudication Verify the qualifying service was processed by the payer.
- Submit linking documentation Provide claim numbers and dates linking both services.
- Resubmit Resubmit once the prerequisite is confirmed as adjudicated.
Appeal with documentation showing the qualifying service was completed and adjudicated. Include the qualifying service claim number, date of service, remittance advice, and clinical records. If the qualifying service was performed by another provider, include records from that provider.
Common RARC Pairings
The RARC code tells you exactly what triggered the CO-B15:
| RARC | Description |
|---|---|
| N381 | Alert: Consult your contractual agreement for restrictions, billing, and payment information. Review the payer's requirements for qualifying prerequisite services → |
| N130 | Alert: You may need to review plan documents or guidelines. Check plan guidelines for the specific qualifying service requirements → |
How to Prevent CO-B15
- Verify payer-specific prerequisite service requirements before scheduling dependent procedures
- Ensure qualifying services are billed and adjudicated before submitting dependent service claims
- Implement billing workflow checks that verify qualifying service coverage before billing dependent services
- Maintain a reference of payer-specific step therapy and prerequisite requirements
- Communicate with referring providers to ensure qualifying services have been completed
Also Filed As
The same CARC B15 may appear with different Group Codes:
Related Denial Codes
Sources
- https://x12.org/codes/claim-adjustment-reason-codes
- https://www.mdclarity.com/denial-code/b15
- https://www.cms.gov/regulations-and-guidance/guidance/manuals
- Codes maintained by X12. Visit x12.org for official definitions.