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Patient responsibility · Last verified 2026-08-30

CARC 2 denial code on dental claims

Independent publisher · Drafted with AI assistance, verified against primary sources · Credentialed review pending

CARC 2 is the “Coinsurance” code on a dental remittance. Nothing here was refused, so there is no appeal to file.

Group code: X12 places no group-code restriction on 2. CMS names deductible and copay as its typical patient-responsibility examples; coinsurance is a reasonable extension of that wording rather than something CMS states. A group code always travels with a CARC, and it — not the CARC — assigns financial responsibility, so read the one on your remittance rather than assuming.

Registry entry: X12 Claim Adjustment Reason Code 2 — active, with no deactivation date. Read on the list published 2025-11-01.

Verdict

Not a denial — nothing to appeal

The code records patient liability or an additional payment rather than a refusal. Verify the amount posted correctly and move on.

Nothing to appeal. Check the percentage against the benefit category the payer assigned the procedure, since a mis-categorised procedure changes the patient's share.

The appealability verdicts on these pages are Dentovio's editorial classification. No standards body or payer publishes an appealability taxonomy: X12 defines what a code means, not what to do about it. Each verdict is built from the code's own mechanics and the payer and federal documents cited on the page, and it is a starting point for triage rather than a prediction of any outcome.

What it means in dental

The patient's percentage share of the allowed amount for this service.

Also not a denial. The number to check is the percentage against the plan's category — preventive, basic, and major coinsurance tiers are where estimates and remittances most often part company.

What to do

  1. 1.Compare the coinsurance percentage against the plan's tier for that procedure category
  2. 2.If the category looks wrong, that is a processing question, not a patient-balance question
  3. 3.Bill the patient promptly once the category checks out

Remark codes verified with this CARC

No source read for this page pairs a remark code with CARC 2. X12 defines no CARC-to-RARC pairings at all: payer crosswalks are specific to that payer's own internal reason codes, and the CAQH CORE combination list binds only payers operating inside its business scenarios. Read the remark code on your own remittance.

Read with this code

Sources

Last verified 2026-08-30. 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. This page was drafted with AI assistance and verified against the primary sources linked here. It has not been reviewed by a credentialed dental billing specialist, attorney, or clinician. 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. How this data is verified