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Billing & claims · Last verified 2026-08-30

Localized antimicrobial delivery (D4381) — payer documentation requirements

Most Aetna plans do not cover this code at all. Where payers do cover it, the criteria are narrow — each one is below.

Placing a slow-release antimicrobial into a specific gum pocket after deep cleaning. CDT codes referenced by number only.

Why these claims get denied

This is a coverage question before it is a documentation question: several plans exclude the service outright. Where it is covered, payers cap the number of teeth per quadrant and require an isolated refractory site with pocket depths in a stated range.

Aetna

Public — no login

Aetna's headline position is that localized antimicrobial delivery is not covered in most of its dental plans and is not covered at all for members whose plan became effective after October 1, 2016; where a grandfathered plan covers it, DCPB003 sets a refractory-site definition and a post-therapy healing window.

  • Localized delivery of antimicrobial agents is not a covered service in most Aetna dental plans, and D4381 is not covered for members whose dental plan became effective after October 1, 2016
  • Where the plan does cover it, treatment follows completion of scaling and root planing by an adequate healing period of 6 weeks to 6 months
  • Refractory sites are isolated pockets of 5 mm or greater with persistent signs of inflammation, spontaneous bleeding or bleeding on probing, suppuration, and/or increasing loss of clinical attachment
  • Use where the teeth show no bone loss or probing depths under 5 mm is classified experimental and investigational, as is use around implants
  • The criteria also reach isolated refractory sites diagnosed during a covered periodontal maintenance procedure
  • With multiple refractory sites or generalized residual inflammation after scaling and root planing, the bulletin states that localized delivery is not appropriate treatment and that a more comprehensive intervention such as surgical therapy may be necessary
  • No maximum number of teeth or sites and no same-day billing restriction appear in the bulletin; 'per tooth' is how the code itself is billed, not a limit Aetna imposes

Published threshold: Isolated pockets of 5 mm or greater with persistent inflammation; probing depths under 5 mm, or an absence of bone loss, are treated as experimental and investigational.

Verified 2026-08-30 · read from

Aetna DCPB003 — Local delivery of antimicrobial agents, updated March 13, 2026 (Policy, Background and Codes sections)

Delta Dental of New Jersey

Public — no login

Delta Dental of New Jersey benefits localized antimicrobial delivery by individual consideration for refractory cases: no more than two teeth per quadrant, pockets of at least 5 mm and less than 10 mm, and either a 6-week-to-6-month window after initial therapy or a patient of record on maintenance.

Scope: Delta Dental of New Jersey — a separate member company from the Delta Dental Ins. enterprise record above.

  • The benefit is discretionary — it may be benefited for refractory cases by individual consideration, subject to dental-consultant review
  • Two alternative pathways qualify: performance six weeks to six months following initial therapy — scaling and root planing or periodontal surgery — or treatment of a patient of record on periodontal maintenance following initial therapy
  • Where a pathway is met, no more than two refractory sites (teeth) per quadrant qualify, with pocket depths of at least 5 mm and less than 10 mm
  • The 2026 required-documentation chart lists a prior authorization plus a periodontal chart taken after scaling and root planing and before placement
  • The handbook's own note is that group contract provisions can vary and the office should contact the member company for the group's specific limitations; some New Jersey Delta plans exclude localized antimicrobial delivery outright

Published threshold: Isolated refractory sites with pocket depths of at least 5 mm and less than 10 mm — a 10 mm pocket does not meet the criterion.

Frequency / timing: No more than two teeth per quadrant.

Verified 2026-08-30 · read from

Delta Dental of New Jersey 2023 Participating Dentist Handbook, Ch. 9 Delta Dental National Processing Policies, p. 177 (PDF)Delta Dental NJ & CT Required Documentation Chart 2026, p. 8 (PDF)Delta Dental of New Jersey individual policy — periodontic specific exclusions, p. 30 (PDF)

DentaQuest (Medicaid/CHIP administrator)

Public — no login

In DentaQuest's Texas Medicaid child program localized antimicrobial delivery is covered for ages 13 to 20, once every two years per tooth, with prior authorization or review plus a narrative of medical necessity and a pre-operative x-ray.

Scope: DentaQuest's Texas Medicaid child (under-21) program.

  • Covered for ages 13 to 20, teeth 1 through 32
  • Limited to one service every two years, per patient, per tooth
  • The listed documentation is a narrative of medical necessity plus a pre-operative x-ray

Frequency / timing: One service every two years, per patient, per tooth.

Verified 2026-08-30 · read from

DentaQuest Texas Authorization Catalog — prior-authorization and pre-payment-review code table (PDF)DentaQuest Texas HHSC Medicaid/CHIP Office Reference Manual, © January 1, 2026 — Exhibit A and clinical criteria (PDF)

MCNA Dental (Medicaid/CHIP administrator)

Public — no login

MCNA's Texas children's program covers localized antimicrobial delivery for ages 13 to 20 with prior authorization, x-rays, periodontal charting and documented medical necessity.

Scope: MCNA's Texas children's Medicaid book, birth through age 20.

  • Covered for ages 13 to 20 as adjunctive therapy
  • Requires prior authorization, x-rays, periodontal charting and documentation of medical necessity

Verified 2026-08-30 · read from

MCNA Texas Medicaid and CHIP Provider Manual v1.31, effective March 1, 2026

Other payer records without an extracted rule for this procedure

An absent record does not mean the payer has no policy. It means Dentovio has not extracted a rule for this procedure from that payer's material — and in several cases a verifier read the payer's public criteria in full and found no entry for the code, which is recorded in that payer's notes below rather than invented as a rule.

  • Delta Dental (Delta Dental Ins. enterprise) — Public — no login. This record covers seven named companies only — Delta Dental Insurance Company and Delta Dental of California, Delaware, the District of Columbia, New York, Pennsylvania (including Maryland), and West Virginia. Two other Delta member companies are recorded separately below, and none of the three may be read onto another. The criteria PDF is permission-locked against copying and the national Dentist Handbook PDFs are marked for internal member-company use despite public hosting, so Dentovio paraphrases and links rather than republishing. Delta Dental states these are guidelines used to authorize, modify or deny care, and that treatment may vary with the benefits covered under the individual contract. Delta Dental Ins. Clinical Criteria / Utilization Management, Section 4, effective January 1, 2025 pending state regulatory approval (PDF)
  • Delta Dental of Arkansas (Delta Dental Smiles, Arkansas Medicaid) — Public — no login. This record covers Arkansas Medicaid only and is a different member company from the two Delta Dental records above. The manual carries no confidentiality marking. Children's and adult exclusion wording differ in places and must not be quoted for one another. Delta Dental Smiles Provider Manual V12, Delta Dental of Arkansas (PDF)
  • MetLife — Provider portal login required. MetLife is the one payer here whose criteria Dentovio cannot read: the provider portal is credential-gated and the official public copy of the resource manual was unavailable on every attempt, so no scaling, crown or post-and-core rule is published under MetLife's name here. The one record that exists comes from a plan sponsor's summary plan description, not from MetLife's own policy library, and is scoped that way. An absent MetLife record means Dentovio could not read the document, never that MetLife has no rule. MetLife dental provider portal (current criteria; single sign-on required)
  • United Concordia — Public — no login. United Concordia's clinical policy is public, not portal-gated — what is gated is a different artifact, the commercial Dentist Reference Guides. The policy is stamped proprietary and prohibits dissemination beyond limited individual-use copying, so Dentovio paraphrases and links rather than reproducing it. Localized antimicrobial delivery is genuinely absent from the public PPO policy. Rules read from the DE/PA/WV Medical Assistance guide are state Medicaid program rules and do not describe a commercial PPO patient's plan, and United Concordia states that where its policy conflicts with the member's benefit plan, the plan governs. United Concordia Dental Clinical Policy (PPO), last update 5.1.26 — public behind a no-login acknowledgement (PDF)
  • Guardian — Public — no login. Guardian publishes these criteria without a login, and the guidelines carry no confidentiality marking. Individual plan provisions still control benefits: every section states that clinical guidelines are subject to individual consideration by Guardian's dentist consultants and that individual plans may vary. The public 2026 guidelines contain no periodontal-maintenance, full-mouth-debridement, localized-antimicrobial, implant, or removable-prosthodontics entry — Dentovio read all 13 pages on 2026-08-30 to confirm those absences rather than infer them. Replacement intervals are not in the clinical guidelines at all; they are in the network dentist manual. Guardian provider toolkit — public clinical-guidelines link
Last verified 2026-08-30. Dentovio is an independent publisher — not a dental payer, the ADA, or any state dental board. 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 or clinician. These summaries describe the payers' published clinical-review and documentation criteria as addressed to dentists — what a reviewer looks for on a claim, never what a patient's plan pays. Individual plan contracts govern: every payer document here states that the member's plan documents control coverage, frequencies and exclusions where they conflict with the policy, and payers revise policy documents on their own schedules. Where a record's reach is narrower than the payer — one plan line, one federal program, one state Medicaid program — or where a figure comes from a plan-sponsor or federal-program document rather than the payer's own policy manual, the record says so. Educational billing reference only, not billing, legal, or clinical advice. 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. How this data is verified