What does denial code CARC 45 mean on a dental claim, and can it be appealed?

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.

Pricing, bundling, and fee schedules · Last verified 2026-08-30

CARC 45 denial code on dental claims

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

CARC 45 is the “Above the allowed fee” code on a dental remittance. Whether it can be contested depends on the facts; run the checks below first.

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.

Registry entry: X12 Claim Adjustment Reason Code 45 — active, with no deactivation date. Read on the list published 2025-11-01.

Verdict

Depends — check the facts first

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.

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 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.

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.

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 verified with this CARC

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.

Appeal routes, by plan funding

Fully-insured route

State insurance law (prompt-pay statutes + plan appeal terms)

Check the state's prompt-pay rule first — an overdue clean claim may already be accruing interest without any appeal. Then run the policy's internal appeal, and escalate to the state insurance department where deadlines were missed.

Self-funded (ERISA) route

29 CFR 2560.503-1

Appeal in the patient's name (or with an authorized-representative form), demand the claim file and the specific internal rule relied on, and hold the plan to the 30/60-day clocks in writing. Before counting on a state remedy, read that state's own scope provision: several state prompt-pay and external-review statutes reach only insurers and HMOs by their terms, so they do not extend to a self-funded plan.

Medicaid managed care route

42 CFR 438.402 / 438.408

First classify the dispute. For an enrollee benefit denial, track two clocks in order: 60 days to the plan appeal, then (after the resolution notice) the state's 90–120-day fair-hearing window, with written consent before a provider acts for the enrollee. For a provider payment or contract dispute, use the provider contract and state Medicaid program process instead. For members under 21, federal EPSDT coverage rules also matter.

Read with this code

CARC 97 — Bundled into another service

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