# CARC 252 denial code on dental claims > What does denial code CARC 252 mean on a dental claim, and can it be appealed? URL: https://dentovio.com/dental-claim-denial-codes/carc-252 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. ## Direct answer On a dental remittance, CARC 252 means: The payer cannot finish adjudicating without documentation it has not received, and must name what is missing in an accompanying remark code. X12 restricts its group code to CO or PI. The code's own definition requires an accompanying remark code, so a remittance carrying it without one is incomplete. Remark codes verified with it: N401, N706, N928, N931. Dentovio's appealability verdict — technical: fix and resubmit. Send what was asked for rather than arguing the decision. Work from the payer's own published documentation requirements for the procedure so the resubmission cannot be judged deficient a second time, and watch the response window — leaving the request unanswered turns a 252 into a 226. Registry entry: X12 Claim Adjustment Reason Code 252 — in the code set since 2012-09-30; description last revised 2013-06-02; active, with no deactivation date. Read on the list published 2025-11-01. Group code: X12 restricts the group code on CARC 252 to CO or PI. In CAQH CORE business scenario 1 — additional information required — a 252 may carry only CO or PI, never PR, so the balance is not the patient's. The hedge that travels with it: a payer whose business requirements are not met by that scenario is not bound to the CORE combinations at all. This code's own definition requires an accompanying remark code, so a remittance carrying it without one is incomplete. ## What it means in dental context This is the attachment code, and the dental specifics live in the remark layer rather than in 252 itself. The perio-charting remark codes N401 and N402 replaced the older N483 and N484, which X12 stopped on 2015-05-01 — do not work from a guide that still cites them. Payers also differ on what must be attached versus retained: New York Medicaid requires radiographs to be submitted with prior-approval requests and for prefabricated crowns, but requires the periodontal detail behind scaling and root planing to be kept in the treatment record rather than sent with the claim. ## Appealability: Technical — fix and resubmit 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. The route here is correcting the identified defect and resubmitting as a corrected claim, inside the timely-filing window, rather than arguing the decision. Send what was asked for rather than arguing the decision. Work from the payer's own published documentation requirements for the procedure so the resubmission cannot be judged deficient a second time, and watch the response window — leaving the request unanswered turns a 252 into a 226. ## What to do 1. Read the remark code: it names the document, and since 2026-07-01 the imaging remarks are specific down to bitewings and pre- and post-operative views 2. Match the resubmission against the payer's published documentation list for that procedure 3. Check whether the payer wants the record submitted or retained — for periodontal detail, some require only that you keep it ## Remark codes verified with this CARC X12 defines no CARC-to-RARC pairings. Each combination below is either a payer's own published crosswalk (true for that payer's internal reason code, not as a general rule), a CAQH CORE-required combination, or a remark whose registry meaning describes this adjustment. ### N401 — Periodontal charting was not supplied. What to do: Attach complete charting for the quadrants billed, with probing depths recorded. Basis: Required combination under the CAQH CORE rule. A CORE-required combination for 252 in business scenario 1, under group code CO or PI (v3.10.0, February 2026). - CAQH CORE-required Code Combinations for CORE-defined Business Scenarios, v3.10.0, February 2026 (Master sheet and Business Scenario #1): - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ### N706 — Documentation the payer needs is missing. What to do: Identify what the payer's policy for the procedure requires and send it; the remark itself does not name the document. Basis: Required combination under the CAQH CORE rule. A CORE-required combination for 252 (v3.10.0, February 2026). It is not a listed partner for 226. - CAQH CORE-required Code Combinations for CORE-defined Business Scenarios, v3.10.0, February 2026 (Master sheet and Business Scenario #1): - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ### N928 — A bitewing or periapical image is missing or unusable. What to do: Send a dated, diagnostic-quality image of the type named, labelled with the patient and the date it was taken. Basis: Matches on the remark's registry meaning — no source pairs them. One of the dental imaging remark codes X12 started on 2026-07-01. No combination list pairs it with a CARC yet, so treat it as the remark that describes this adjustment rather than as a fixed pairing. - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ### N931 — Pre-operative or post-operative bitewing or periapical images are missing or unusable. What to do: Send the pre-operative image the payer's criteria name; for most restorative reviews that is the diagnostic evidence the decision turns on. Basis: Matches on the remark's registry meaning — no source pairs them. Same 2026-07-01 imaging batch. Any guide written before that date does not have these codes. - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ## Documentation pages for this denial family - [Scaling and root planing (D4341 / D4342) — payer documentation requirements](https://dentovio.com/dental-claim-documentation/d4341-scaling-and-root-planing/index.html.md) - [Crowns (D2710–D2799) — payer documentation requirements](https://dentovio.com/dental-claim-documentation/d2740-crowns/index.html.md) - [Core buildup (D2950) — payer documentation requirements](https://dentovio.com/dental-claim-documentation/d2950-core-buildup/index.html.md) ## Read with this code - [CARC 250 — Wrong document sent](https://dentovio.com/dental-claim-denial-codes/carc-250/index.html.md) - [CARC 251 — Attachments insufficient](https://dentovio.com/dental-claim-denial-codes/carc-251/index.html.md) - [CARC 226 — Provider never answered](https://dentovio.com/dental-claim-denial-codes/carc-226/index.html.md) ## Sources - X12 Claim Adjustment Reason Codes (external code list 139) (list updated 2025-11-01): - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): - 45 CFR 162.1602 — HIPAA adoption of the 835 remittance standard that carries these codes: - CAQH CORE-required Code Combinations for CORE-defined Business Scenarios, v3.10.0, February 2026 (Master sheet and Business Scenario #1): - New York State Medicaid Dental Policy and Procedure Code Manual, Version 2026 (effective 2026-01-01) (Prior Authorization Checklist p. 18; Other Restorative Services p. 33; Non-Surgical Periodontal Services p. 37): ## Related - [Dental billing and claims hub](https://dentovio.com/dental-billing/index.html.md) - [All dental denial codes](https://dentovio.com/dental-claim-denial-codes/index.html.md) - [Payer documentation requirements](https://dentovio.com/dental-claim-documentation/index.html.md) - [Dental insurance prompt-pay laws by state](https://dentovio.com/dental-prompt-pay-laws/index.html.md) - [Dental claim appeal letters](https://dentovio.com/dental-claim-appeal-letters/index.html.md)