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Denial Code A0

CARC A0: Patient refund amount

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

306
Type of bill is inconsistent with the patient status
307
Medicare Maximum Fair Price Standard Default Refund Amount Adjustment. Remark code require…
308
Payment is adjusted due to contracted funding agreement between the payer and provider
A1
Claim/Service denied. Remark code required
A5
Medicare Claim PPS Capital Cost Outlier Amount
A6
Prior hospitalization or 30 day transfer requirement not met

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