# CARC 97 denial code on dental claims > What does denial code CARC 97 mean on a dental claim, and can it be appealed? URL: https://dentovio.com/dental-claim-denial-codes/carc-97 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 97 means: The payer did not pay this line separately because it treated the value as already included in the allowance for another adjudicated service. X12 assigns it no group code, so the group code on the remittance is the payer's choice under its own contract and it, not the CARC, decides who is assigned the balance. Remark codes verified with it: M15, N19. Dentovio's appealability verdict — depends: check the facts first. The cause controls. A policy-stated bundle, such as a buildup folded into a crown without preoperative evidence of separate necessity, is unlikely to change after the fact. A bundling edit applied to genuinely distinct services on different teeth or dates can be contested with charting that shows the separation. Delta Dental's documentation request leads with a pre-operative periapical radiograph and a written report; intraoral photographs support it rather than replace it. Registry entry: X12 Claim Adjustment Reason Code 97 — active, with no deactivation date. Read on the list published 2025-11-01. Group code: X12 places no group-code restriction on 97. 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. Offices commonly write this one as CO 97; that is search shorthand, not a statement that the payer will use CO. ## What it means in dental context Dental's signature bundle: core buildup (D2950) folded into the crown fee. Also irrigation folded into SRP and limited exams folded into periodic exams within the payer's window. Where a buildup is contested, payer policy is the ground: Delta Dental's published claim guidance frames the buildup as payable where a major part of the tooth's structure — commonly around 50% — is fractured or carious, and its Michigan company states the pediatric criterion with that percentage while its adult criterion states no number at all. Treat roughly 50% as a common payer threshold that varies by payer, never as a rule. The counterpart is just as important: a buildup that only fills an undercut or a concave irregularity in the preparation belongs in the crown prep and is not separately payable. ## Appealability: Depends — check the facts first 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. A valid contract term may control, while a factual error may be contested. Run the checks on this page before using the appeal window. The cause controls. A policy-stated bundle, such as a buildup folded into a crown without preoperative evidence of separate necessity, is unlikely to change after the fact. A bundling edit applied to genuinely distinct services on different teeth or dates can be contested with charting that shows the separation. Delta Dental's documentation request leads with a pre-operative periapical radiograph and a written report; intraoral photographs support it rather than replace it. ## What to do 1. Identify which service the payer bundled this one into (the ERA shows the adjudicated pair) 2. Check the payer's published bundling rule for the pair before drafting anything 3. Lead the response with the pre-operative radiograph and report the payer's policy names, then the photographs and narrative 4. If the services were clinically distinct, appeal with site- and date-specific documentation ## 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. ### M15 — The line was folded into another procedure as a component of it, and is not paid on its own. What to do: Establish whether the two services were genuinely distinct in site, date, or clinical purpose before contesting. Basis: Matches on the remark's registry meaning — no source pairs them. The remark whose registry meaning is bundling. No source read for this page pairs it with 97 as a rule — and the pairing published almost everywhere, M86, means something else entirely: payment already made for a same or similar procedure inside a set time frame. - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ### N19 — The procedure is treated as incidental to the primary procedure on the claim. What to do: Check whether the payer's policy names the pair as incidental; an incidental designation is a policy statement, not a coding error. Basis: Matches on the remark's registry meaning — no source pairs them. The second remark whose registry meaning describes this adjustment. Shown for meaning, not as a verified pairing. - X12 Remittance Advice Remark Codes (external code list 411) (list updated 2026-07-01): ## Documentation pages for this denial family - [Core buildup (D2950) — payer documentation requirements](https://dentovio.com/dental-claim-documentation/d2950-core-buildup/index.html.md) - [Crowns (D2710–D2799) — payer documentation requirements](https://dentovio.com/dental-claim-documentation/d2740-crowns/index.html.md) ## Read with this code - [CARC 234 — Not paid separately](https://dentovio.com/dental-claim-denial-codes/carc-234/index.html.md) - [CARC 236 — Same-day combination not allowed](https://dentovio.com/dental-claim-denial-codes/carc-236/index.html.md) - [CARC 45 — Above the allowed fee](https://dentovio.com/dental-claim-denial-codes/carc-45/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: - Delta Dental — FYI, claim tips for core buildups (2022-12-02): - Delta Dental of Michigan — clinical criteria (core buildup, adult and pediatric criteria): ## 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)