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Denial Code 18

CARC 18: Exact duplicate claim/service

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

13
The date of death precedes the date of service
14
The date of birth follows the date of service
16
Claim/service lacks information or has submission/billing error(s)
19
This is a work-related injury/illness and thus the liability of the Worker's Compensation …
20
This injury/illness is covered by the liability carrier
21
This injury/illness is the liability of the no-fault carrier

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