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Denial Code N645

RARC N645: Mark-up allowance

This is a Remittance Advice Remark Code (RARC, N-series) — a remark that supplements a CARC on the remittance advice (ERA/EOB) to add detail. 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 RARC codes

N642
Adjusted when billed as individual tests instead of as a panel
N643
The services billed are considered Not Covered or Non-Covered in the applicable state fee …
N644
Reimbursement has been made according to the bilateral procedure rule
N646
Reimbursement has been adjusted based on the guidelines for an assistant
N647
Adjusted based on diagnosis-related group
N648
Adjusted based on Stop Loss

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