# CARC 22 denial code on dental claims > What does denial code CARC 22 mean on a dental claim, and can it be appealed? URL: https://dentovio.com/dental-claim-denial-codes/carc-22 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 22 means: The payer believes another plan is responsible first under coordination-of-benefits rules. 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: MA04. Dentovio's appealability verdict — technical: fix and resubmit. Usually an ordering problem rather than a coverage decision: establish which plan is primary, bill it, and send this payer the primary's explanation of benefits. Watch the filing clock — a claim that spends months at the wrong payer first is the classic route to a timely-filing denial. Registry entry: X12 Claim Adjustment Reason Code 22 — in the code set since 1995-01-01; description last revised 2007-09-30; active, with no deactivation date. Read on the list published 2025-11-01. Group code: X12 attaches no group-code restriction to 22, unlike the duplicate code 18 where it does. Any OA-or-CO assertion about 22 is an inference. 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. ## What it means in dental context State Medicaid is the payer of last resort, and its crosswalks show it: MassHealth's own EOB behind this code is literally named for Medicaid always being the final payer, and it maps more than a dozen third-party-liability and Medicare situations to it. On the commercial side this is the order-of-benefits question — which plan is primary for this patient on this date. ## 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. Usually an ordering problem rather than a coverage decision: establish which plan is primary, bill it, and send this payer the primary's explanation of benefits. Watch the filing clock — a claim that spends months at the wrong payer first is the classic route to a timely-filing denial. ## What to do 1. Re-verify coverage and establish which plan is primary on the date of service 2. File with the primary payer first, then send this payer the primary's EOB 3. Check whether this payer restarts its filing window from the primary's EOB date; many do ## 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. ### MA04 — The payer cannot process as secondary until it knows who the primary payer is and what it paid. What to do: Send the primary payer's explanation of benefits with the identity of the primary carrier on the claim. Basis: Seen in a payer's own published crosswalk. MassHealth pairs its payer-of-last-resort EOB with CARC 22 and MA04. Note the contrast with N4, the missing prior-carrier-EOB remark, which that same crosswalk puts on CARC 16 rather than 22. - MassHealth — Claim Adjustment Reason Codes and Remittance Advice Remark Codes crosswalk (posted 2026-02-12) (EOB 2516, p. 24): ## Read with this code - [CARC 109 — Wrong payer](https://dentovio.com/dental-claim-denial-codes/carc-109/index.html.md) - [CARC 16 — Missing or invalid information](https://dentovio.com/dental-claim-denial-codes/carc-16/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: - MassHealth — Claim Adjustment Reason Codes and Remittance Advice Remark Codes crosswalk (posted 2026-02-12) (EOB 2516, p. 24): - MassHealth — Claim Adjustment Reason Codes and Remittance Advice Remark Codes crosswalk (posted 2026-02-12): ## 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)