CO-B12Contractual ObligationDocumentation
CO-B12 Denial Code: Services not documented in medical records
Audit-driven denial: the billed services can't be found in the patient's records.
Why CO-B12 happens
- ●Charge entry without corresponding documentation
- ●Records incomplete at the time of review
How to fix a CO-B12 denial
- 1
Locate and submit complete documentation on appeal if it exists
- 2
If it doesn't, write off and audit the charge-capture disconnect — repeated hits invite payer scrutiny
How to prevent it
Charge-to-documentation reconciliation before claims release.
Drowning in CO-B12 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.