# CO 197 denial code on dental claims > What does denial code CO 197 mean on a dental claim, and can it be appealed? URL: https://dentovio.com/dental-claim-denial-codes/co-197 Last verified: 2026-08-29 Dentovio is an independent publisher — not a payer, the ADA, X12, or any government agency. Code meanings on this page are Dentovio's paraphrases of the X12 Claim Adjustment Reason Code list (the official descriptions are published by X12 and are its copyrighted work); appealability verdicts are editorial guidance grounded in payer-filed denial data and published payer policies. Educational billing reference only — not billing, legal, or clinical advice. Plan contracts control individual outcomes. ## Direct answer On a dental remittance, code CO 197 means: Required precertification, prior authorization, notification, or pre-treatment review was not obtained before the service. depends: check the facts first. If authorization truly was required and skipped, most contracts make this a provider write-off — the appeal angle is narrow: emergencies, retro-authorization windows the plan allows, or proof authorization was actually obtained (reference numbers win these). Florida adds a payer-side rule for 2025-renewed contracts: a claim for a procedure specifically included in a prior authorization cannot be denied except in enumerated circumstances. ## What it means in dental context Common on implants, orthodontics, and major restorative under plans that require pre-treatment review — and on Medicaid dental programs with authorization rules (Delta Dental of Washington requires prior authorization for SRP at ages 13–18 under Apple Health, per its published criteria). ## Appealability: Depends — check the facts first Contractual variants of this denial are final; factual-error variants are winnable. Run the checks on this page before spending the appeal window. If authorization truly was required and skipped, most contracts make this a provider write-off — the appeal angle is narrow: emergencies, retro-authorization windows the plan allows, or proof authorization was actually obtained (reference numbers win these). Florida adds a payer-side rule for 2025-renewed contracts: a claim for a procedure specifically included in a prior authorization cannot be denied except in enumerated circumstances. ## What to do 1. Search call logs and portals for an authorization reference number before conceding 2. Check the plan's retro-authorization window — some allow requests within days of service 3. For Florida contracts renewed since January 1, 2025, check §627.6131(21) if the denied procedure was inside an approved prior authorization ## Official source - X12 Claim Adjustment Reason Codes (official descriptions): - HIPAA adoption of the 835 remittance standard that carries these codes (45 CFR 162.1602): ## Related - [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)