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Dentovio public answer
On a dental remittance, CARC 18 means: The payer matched this submission to a claim or service line it had already received without a material difference.
On a dental remittance, CARC 18 means: The payer matched this submission to a claim or service line it had already received without a material difference. X12 restricts its group code to OA. No source read for this page pairs a specific remark code with it. Dentovio's appealability verdict — 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.
Dentovio is an independent publisher — not a payer, the ADA, X12, CAQH CORE, or any government agency. Code meanings and remark-code meanings on this page are Dentovio's own wording, written from the official X12 Claim Adjustment Reason Code and Remittance Advice Remark Code lists and linked back to them; X12 holds the copyright in those lists and its descriptions are not reproduced here. CDT codes are referenced by number only; CDT is the American Dental Association's copyrighted code set and this page does not reproduce ADA descriptors. Appealability verdicts are Dentovio editorial classification, not a standard. Every fact traces to the code steward's registry, a federal rule or manual, a HIPAA operating rule, an association publication, or a named payer's own document — never to a billing blog. Educational billing reference only — not billing, legal, or clinical advice. Plan contracts control individual outcomes, and processing policies usually live in the payer's provider manual rather than in the signed agreement.
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