CO-B23Contractual ObligationProvider Enrollment
CO-B23 Denial Code: Procedure not authorized per CLIA proficiency
The lab test billed isn't authorized under your CLIA certificate's proficiency category.
Why CO-B23 happens
- ●Test complexity beyond the site's CLIA certificate (e.g., moderate-complexity test under a waived certificate)
How to fix a CO-B23 denial
- 1
Verify the certificate level and the test's complexity categorization; correct billing site or upgrade certification
How to prevent it
Map every billed test to the performing site's CLIA scope.
Drowning in CO-B23 denials?
OakClaim works every denial within 48 hours and builds prevention rules so they stop recurring.