What should the D3346 chart note include?
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Retreatment of root canal - anterior tooth. RMH: Medical history reviewed/updates Vitals: BP/pulse; other vitals if indicated Tooth: #Tooth number(s) Indication: Indication/diagnosis Previous RCT failure. Persistent periapical pathology. Symptomatic. Retreatment support: Approximate prior RCT date Failure description: What portion of prior RCT failed and how retreatment addresses it Consent: Consent/PARQ reviewed; signed/verbally obtained Diagnostic tests/radiographs: Diagnostic tests, pre-op/working/post-op radiographs and findings Pulpal/periapical diagnosis: Pulpal and periapical diagnosis Endo radiograph sequence: Diagnostic-quality pre-op, working length, post-op/final radiographs and findings Diagnostic tests/findings: Cold/EPT/percussion/palpation/probing/sinus tract findings Working lengths/file sizes: Canal working lengths and final file type/sizes Irrigation/obturation details: Irrigants, medicaments, sealer, obturation material Restoration recommendation/prognosis: Definitive restoration needed and prognosis Anesthesia: Anesthetic used Carps: Carpules/amount Procedure: Isolation with rubber dam. Access opened. Pulpal status upon entry: Pulpal status/condition Previous obturation material removed. Canal renegotiated to apex. Working length established. Radiograph confirmed. Canal reinstrumented to size: Final instrument size Copious irrigation with NaOCl. Canal dried with paper points. Reobturation with gutta percha and sealer. Radiograph confirmed adequate fill. Access sealed with: Access seal material Complications: None or describe. Patient tolerance: Tolerance/response. Post-op instructions: Instructions reviewed. Crown recommended. NV: Next visit
What documentation is required for D3346?
Retreatment claims are documentation-driven: the entire premise of D3346 is that prior endodontic therapy existed and failed. The chart must establish (1) prior RCT history, (2) clinical and radiographic evidence of failure, (3) the specific failure mode being addressed, and (4) that the planned approach is orthograde rather than surgical. A defensible D3346 note includes:
- Tooth number — universal numbering, anterior range #6-#11 or #22-#27. One tooth per D3346 line item; multi-canal anteriors (e.g., a maxillary central with separate buccal and lingual canals, or a two-canal mandibular incisor) still bill as a single D3346.
- Indication / diagnosis — explicit statement that the tooth has prior endodontic treatment that has failed. Generic "root canal" language is insufficient; the diagnosis is failed prior endodontic therapy with the specific failure mode named (persistent symptoms, periapical pathology not resolving, suspected missed canal, voids in prior fill, separated instrument bypassable, coronal leakage, etc.).
- Prior RCT history — approximate date of the original RCT, treating provider if known (internal vs external), original obturation material if identifiable from the prior PA (gutta percha vs paste vs silver point — the latter raises complexity and is often quoted at a higher fee). If the original date is not known, document the basis for the estimate ("PA from 2018 in our records shows obturation in place").
- Failure mode — what specifically failed and how retreatment will address it. AAE Colleagues for Excellence enumerates the most common modes: persistent or recurrent apical periodontitis, missed canal, inadequate length, voids, coronal leakage, separated instrument, and recurrent caries breaching the seal. Name the one(s) present.
- Diagnostic-quality preoperative imaging — preoperative PA at minimum; CBCT is strongly preferred (and frequently expected by carriers) when a PARL is present, when a missed canal is suspected, or when the failure mode cannot be characterized on 2D imaging alone. The AAE/AAOMR joint position recommends CBCT for the assessment of nonhealing endodontic outcomes. Document the CBCT findings explicitly if obtained (D0367 billed separately).
- Pulpal and periapical diagnosis — pulpal: previously treated; periapical: asymptomatic apical periodontitis, symptomatic apical periodontitis, acute apical abscess, or chronic apical abscess (with sinus tract). Use the AAE diagnostic terminology — carriers and reviewers expect it on retreatment claims.
- Diagnostic tests — percussion, palpation, mobility, probing depths, sinus tract presence and gutta-percha-traced origin if applicable. Cold and EPT are typically non-contributory on a previously treated tooth and that should be stated rather than left blank.
- Restoration status and removal plan — whether a crown, post, or large direct restoration is present, and whether it will be removed prior to access. Restoration removal is not bundled into D3346; document time and rationale and bill separately under the appropriate code per carrier policy.
- Consent / PARQ — risks discussed should explicitly include reduced predictability vs primary RCT, perforation risk during prior-fill removal or post removal, instrument separation, inability to remove all prior material, persistent or new symptoms, possible need for surgical retreatment (D3410) or extraction if non-surgical retreatment fails, and the typically higher fee than primary RCT. AAE patient education materials and the Colleagues for Excellence Spring 2017 retreatment issue cite ~74-98% success rates depending on case selection and the presence of a PARL — sharing realistic prognosis data is part of informed consent. Note signed vs verbal consent.
- Anesthesia — agent, concentration, vasoconstrictor, technique, and number of carpules. Anesthesia is often required despite the "previously treated, no pulp" status because of periapical inflammation and soft-tissue work.
- Isolation — explicit statement of rubber dam isolation. AAE Treatment Standards make rubber dam isolation a condition of the standard of care; absence is a documentation defect.
- Access and prior-fill removal — access opened (through existing restoration or after removal), prior obturation material identified and removed (solvents like chloroform or eucalyptol, rotary retreatment files such as ProTaper Retreatment, ultrasonic activation, hand files), removal extent confirmed radiographically.
- Canal renegotiation and working length — patency re-established to the radiographic apex, working length determined by apex locator and confirmed with a working-length PA, final file size and taper recorded. Anterior teeth typically finish at a larger apical size on retreatment than on primary RCT (commonly 40-60+) because dentin is removed during the cleaning of the prior preparation.
- Irrigation and disinfection — irrigant sequence (sodium hypochlorite concentration and volume, EDTA for smear layer removal, chlorhexidine if used as final rinse), activation method (passive ultrasonic, sonic, laser, negative pressure), intracanal medicament if a multi-visit approach is used (calcium hydroxide is the conventional choice when a PARL is present and the canal is not obturated same-visit).
- Obturation — final obturation material (gutta percha is the default), technique (cold lateral, warm vertical, single-cone with bioceramic sealer, carrier-based), sealer (AH Plus, bioceramic, ZOE), and a final PA confirming the obturation extent and density. The post-op PA is the imaging carriers most often request on appeal.
- Access seal — material used (Cavit, IRM, glass ionomer, bonded composite). A bonded composite over a glass-ionomer base is the modern preference because coronal leakage is the recurrent failure mode being corrected.
- Restoration recommendation and prognosis — definitive restoration plan (most retreated anteriors are restored with a bonded composite over the access; full coverage is recommended only when structural compromise warrants it — anterior teeth with adequate ferrule and intact marginal ridges often do not require a crown), and a prognosis statement (good / fair / guarded / poor) that reflects case-specific factors (size of PARL, restorability, periodontal status, presence of separated instrument, post removal complications).
- Complications — explicit "None" or describe (perforation, instrument separation that could not be bypassed, sodium hypochlorite accident, post fracture during removal, etc.). Silence is read as an undocumented event.
- Patient tolerance / response — tolerated well, mild discomfort managed, no adverse events.
- Post-op instructions and next visit — pain management, signs of complications to call about, restoration plan and timeline, recall PA at 6-12 months to confirm periapical healing.
The single most common documentation defect is a chart note that reads exactly like a primary RCT note with the word "retreatment" inserted — no prior history, no failure mode, no description of how the prior fill was removed. The audit-defensible note has explicit prior-RCT-date, named-failure-mode, prior-fill-removal-method, and post-op-PA lines that a primary RCT note would not contain.
Why does D3346 get denied?
The most frequent reasons D3346 is denied, downgraded, or recouped:
- No documented prior RCT — by far the most common denial. The chart must establish that prior endodontic obturation was actually present in the canal; "old fill on PA" without a date, provider, or material description is insufficient. Carriers occasionally request the prior preoperative PA showing obturation in place.
- Submitted within 12-24 months of primary D3310 without narrative — looks like the same office is re-charging for incomplete primary therapy. Narrative must explain the specific failure mode (missed canal, separated instrument identified post-fill, coronal leakage, etc.) and why it could not have been addressed at the primary appointment.
- Tooth-class miscoding — D3346 submitted on a premolar (should be D3347) or molar (should be D3348). Universal numbering on the claim and the chart is the safeguard.
- Inadequate narrative of necessity — Aetna, Cigna, MetLife, Delta Dental, and most state Medicaid MCOs treat D3346 as narrative-required. A claim submitted without the clinical narrative is pended or denied even when documentation in the chart is adequate.
- No preoperative PA submitted — a current dated preoperative PA of the tooth is the minimum imaging requirement. Many carriers will pend the claim until the imaging is supplied.
- CBCT findings not cited when PARL is present — claims involving a periapical radiolucency or suspected missed canal are increasingly pended without CBCT support. The AAE/AAOMR position cites CBCT as the imaging of choice for nonhealing outcomes.
- Inadequate post-op imaging — final obturation extent and density should be documented on a final PA. Submitting D3346 without a post-op PA on appeal is a recurring denial trigger.
- Apparent surgical retreatment coded as D3346 — flap reflection and apicoectomy mis-coded as orthograde retreatment. Operative report wording (flap, sectioning, retrograde fill) is the audit signal; correct coding is D3410 with D3471 if a retrograde fill was placed.
- Restoration removal billed separately without documentation — a D3999 or D2999 line for crown or post removal denied because the chart does not document the time, the structure removed, or the rationale.
- Default-template note shared with D3310 — patterned wording with no patient-specific prior-RCT, failure-mode, or prior-fill-removal details. A common audit flag in Medicaid recoupment reviews; the chart must visibly differentiate retreatment work from primary work.
- Retreatment of a tooth with a poor prognosis without documented discussion of alternatives — when the chart does not document that extraction (D7140) or apicoectomy (D3410) was discussed and the patient elected retreatment, carriers occasionally downgrade or deny on medical-necessity grounds. A short PARQ note resolves this.
- Frequency conflict — second retreatment on the same tooth — D3346 already paid on the same tooth in claim history. A re-retreatment requires by-report submission (D3999) with a narrative explaining the new failure and why a third orthograde attempt is justified vs surgical or extraction.
What do practices ask about D3346?
What's the difference between D3346 and D3310?+
Prior endodontic history. D3310 is a primary anterior root canal on a tooth that has never been treated. D3346 is retreatment of an anterior tooth with documented prior obturation that has failed — clinically (persistent or new symptoms), radiographically (new or enlarging PARL, voids, missed canal), or both. The chart-defining elements for D3346 are prior-RCT-date, prior-obturation-material, named-failure-mode, and prior-fill-removal-method, all of which would be absent from a primary RCT note. Submitting D3346 on a tooth that turns out to have never been obturated is the most common reason D3346 claims are recouped on audit.
Why is the D3346 fee higher than the D3310 fee?+
Three reasons. (1) Removing the prior obturation material adds 20-40 minutes per canal depending on material (gutta percha is faster, paste and silver points are slower) and instrumentation strategy (rotary retreatment files, ultrasonics, solvents). (2) Anatomy on a previously treated tooth is harder — instrumented canal walls, ledges, transportations, and missed canals all complicate re-negotiation. (3) Restoration removal, post removal, or working through an existing crown adds time that primary RCT does not require. UCR and PPO fee schedules typically reimburse D3346 at 110-150% of D3310 for those reasons; submitting D3346 at the same fee as D3310 underbills the work performed.
Do I need a CBCT to bill D3346?+
Not always, but increasingly often. The AAE/AAOMR joint position recommends CBCT for nonhealing endodontic outcome assessment when 2D imaging cannot adequately characterize the failure. In practice, carriers (Aetna, Cigna, several Medicaid MCOs) increasingly expect CBCT findings to be cited in the D3346 narrative when a PARL is present, when a missed canal is suspected, or when the prior obturation appears adequate on PA but symptoms persist. CBCT is billed separately under D0367 (mandible or maxilla, limited FOV) or D0364 / D0366; it is not bundled into D3346.
Is restoration removal included in D3346?+
No. D3346 covers the endodontic work itself — access through the existing restoration, prior-fill removal, re-instrumentation, and re-obturation. Removal of a crown, post, or large direct restoration solely to gain access is separately billable, most often under D2999 (unspecified restorative) or D3999 (unspecified endodontic procedure, by report) per carrier policy. Document the time, the structure removed, and the rationale; some carriers pay the additional fee, many do not, but the documentation supports the by-report claim regardless.
Can I bill D3346 if I had to abandon the retreatment?+
If the retreatment was substantially completed and the canal was re-obturated, bill D3346 even if the case was complicated (e.g., a separated instrument that was successfully bypassed and obturated around). If the retreatment was abandoned mid-procedure (separated instrument that could not be bypassed, perforation that converted the case to surgical management, prior obturation that could not be removed), D3346 is generally not the right code — bill D3999 (unspecified endodontic procedure, by report) with a narrative describing the work performed and the reason for abandonment. Carrier responses vary; some will reimburse a partial fee, some will not.
What's the success rate for anterior retreatment?+
AAE Colleagues for Excellence (Spring 2017 retreatment issue) cites overall non-surgical retreatment success rates of approximately 74-98%, with the wide range reflecting case selection. Anterior teeth without a preoperative PARL track toward the upper end of the range; anterior teeth with a large PARL, separated instrument, or post-removal complications track lower. The maxillary lateral incisor specifically has a relatively high rate of healing by scar tissue formation, which means a long-term follow-up PARL may resolve to scar rather than to a normal trabecular pattern — useful framing for patient consent and post-op recall expectations.
Do I need prior authorization for D3346?+
Often yes. Aetna's commercial dental claim documentation guidelines require a current dated preoperative PA and a narrative of necessity for D3346. Several state Medicaid MCOs (Liberty Dental, DentaQuest, Envolve) require prior authorization for retreatment codes on permanent teeth. Even when prior auth is not formally required, submitting the claim with the narrative, preoperative PA, and (when indicated) CBCT findings up front substantially reduces pend rates and time-to-payment. Verify the patient's specific plan at eligibility.
Should the retreated anterior tooth get a crown?+
Often no. Unlike retreated premolars and molars, retreated anterior teeth with intact marginal ridges and adequate sound coronal dentin frequently do well with a bonded composite restoration over the access cavity. Full coverage (D2740 or similar) is recommended when the prior restoration has compromised structural integrity, when the access has had to be enlarged enough to reduce ferrule, or when esthetic considerations (e.g., a previously treated tooth with significant discoloration) drive the decision. The blanket "crown after RCT" advice that applies to posterior teeth is not the right default for anteriors.