# CARC 45 denial code on dental claims > What does denial code CARC 45 mean on a dental claim, and can it be appealed? URL: https://dentovio.com/dental-claim-denial-codes/carc-45 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 45 means: The controlling price limit is below the submitted charge, so the payer removed the excess. That limit may come from a contract, fee schedule, statute, or plan allowance. X12 restricts its group code to PR or CO. No source read for this page pairs a specific remark code with it. Dentovio's appealability verdict — depends: check the facts first. The adjustment itself is contractual. What is contestable is the underlying fee schedule: if the allowed amount does not match your contracted schedule, request the fee schedule the claim was priced against and dispute the pricing — that is an underpayment dispute, not a benefits appeal. Registry entry: X12 Claim Adjustment Reason Code 45 — active, with no deactivation date. Read on the list published 2025-11-01. Group code: X12 restricts the group code on CARC 45 to PR or CO. One of the few codes X12 constrains: it may be used only with PR or CO, depending on where liability falls. Which of the two arrives is the difference between a write-off and a patient balance, so read it rather than assuming. ## What it means in dental context On in-network dental claims this is the ordinary contractual write-off, not a denial. It matters when it appears unexpectedly large: a wrong fee schedule attached to your contract, a leased-network rate you did not know governed the claim, or a payer processing under the wrong network tier. ## 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 adjustment itself is contractual. What is contestable is the underlying fee schedule: if the allowed amount does not match your contracted schedule, request the fee schedule the claim was priced against and dispute the pricing — that is an underpayment dispute, not a benefits appeal. ## What to do 1. Compare the allowed amount on the ERA against your contracted fee schedule for that CDT code 2. If they differ, ask the payer in writing which network/lease priced the claim 3. Track underpayment-dispute windows — several states cap them (Florida: 12 months) ## Remark codes No source read for this page pairs a remark code with CARC 45. 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 - [CARC 97 — Bundled into another service](https://dentovio.com/dental-claim-denial-codes/carc-97/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: ## 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)