Dentovio public answer
OA 18 denial code dental
On a dental remittance, code OA 18 means: The payer identified the claim or service as an exact duplicate of one already received. technical: fix and resubmit. Trace the original claim first. If it paid, no action. If it is pending, wait it out (or invoke the state prompt-pay deadline if it is overdue). If it denied, resubmit as a corrected claim with the correction indicated.
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- Last verified
- 2026-08-29
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Source citations
- X12-CARC X12 Claim Adjustment Reason Codes (official list) (x12.org)