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Denial Code B23

CARC B23: Procedure billed is not authorized per your Clinical Laboratory Improvement Amendment proficiency test

This is a Claim Adjustment Reason Code (CARC). CARCs explain why a payer adjusted or denied a claim line and appear with a group code (CO, PR, OA, PI). Codes appear on the EOB / ERA after a claim is adjudicated.

Reference only — CARC/RARC are national code sets updated periodically. Verify against the current official list before acting on a denial or appeal.

Related CARC codes

B16
'New Patient' qualifications were not met
B20
Procedure/service was partially or fully furnished by another provider
B22
This payment is adjusted based on the diagnosis
P1
State-mandated Requirement for Property and Casualty, see Claim Payment Remarks Code for s…
P2
Not a work related injury/illness and thus not the liability of the workers' compensation …
P3
Workers' Compensation case settled. Patient is responsible for amount of this claim/servic…

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