OA-B12: Services Not Documented in Patient Medical Records

What Does OA-B12 Mean?

When paired with Group Code OA, the documentation issue was identified during a post-payment audit, resulting in a recoupment. Appeal the recoupment with the complete medical record.

CARC B12 indicates the payer reviewed the medical records and could not find documentation supporting the services billed on the claim. This denial typically results from a medical records review, post-payment audit, or a documentation request where the records submitted did not contain evidence of the billed services.

The issue may be that records were not submitted when the payer requested them, the submitted records are incomplete and lack sufficient detail, the coding does not match what the medical record describes, or a post-payment audit found the documentation does not support the services originally billed and paid.

This is a documentation issue, not a coverage determination. The payer is not saying the service was not covered — it is saying the medical record does not prove the service was provided. The appeal path involves submitting the complete medical record with comprehensive clinical documentation.

Common Causes

How to Resolve

1. Review the audit findings Understand what the audit identified as undocumented.
2. Appeal with complete records Submit the medical record showing the services were properly documented and provided.

How to Prevent OA-B12

• Maintain complete documentation to withstand post-payment audits
• Respond promptly to records requests to avoid default denials

Also Filed As

The same CARC B12 may appear with different Group Codes:

Related Denial Codes