Retainer Crown — Full Cast High Noble Metal Template

Retainer crown - full cast high noble metal.

RMH: Medical history reviewed/updates
Vitals: BP/pulse; other vitals if indicated

Tooth: #Tooth number(s)
Part of bridge: Bridge/prosthesis details

Bridge support: Teeth replaced with extraction dates; reason for tooth loss; PDI/edentulism class
Retainer tooth status: Health, existing restorations, perio/endodontic status
Material matching: Retainer crown and pontic material match/description
Lab/CAD-CAM details: Lab/material/shade guide/return date/manufacturer or lot if in-house

Visit type: Visit type

Preparation:
Consent: Consent/PARQ reviewed; signed/verbally obtained

Retainer crown code support: Extent of decay/fracture/open margin and surfaces involved
Prior restoration/crown: Material/size/condition; placement date/age if replacement
Image labels: Diagnostic-quality radiographs/photos labeled tooth/date

Radiographs/photos: Radiographs/photos reviewed/taken and findings

Anesthesia: Anesthetic used
Carps: Carpules/amount
Existing restoration removed.
Tooth prepared for crown.
Margins placed.
Impression taken.
Bite registration recorded.
Temporary crown fabricated and cemented.

Delivery:
Bridge seated.
Fit verified.
Margins checked.
Contacts adjusted.
Occlusion adjusted.
Cemented with: Cement used
Excess cement removed.

Patient instructions: Instructions reviewed.

Complications: None or describe.
Patient tolerance: Tolerance/response.

NV: Next visit

Documentation requirements

D6790 is a niche code, but it is one of the easiest retainer codes to defend if the chart and lab paperwork match. The two recurring audit issues are (1) metal certification — proving the alloy actually meets the 60% noble / 40% gold high-noble threshold — and (2) abutment workup — proving the abutment tooth was restorable and periodontally sound before the bridge was made. A chart that addresses both is usually paid as billed.

• Bridge identification — name the bridge in plain language and by tooth numbers: which teeth are abutments (retainers), which are pontics, span length (3-unit, 4-unit, etc.), and which arch. Example: "3-unit posterior bridge, #18-19-20, full-cast high-noble retainers on #18 and #20 with cast high-noble pontic at #19." This single line tells a reviewer what the case is and supports the D6790 / D6210 pairing.
• Retainer tooth identification and prognosis — universal number of the abutment tooth being prepared, current periodontal status (probing depths, mobility, recession, BOP), endodontic status, restorative status, and prognosis (good/fair/guarded/poor). A retainer crown on a guarded-prognosis abutment without a documented alternatives discussion is a known recoupment trigger.
• Why this abutment, why a bridge, and why full cast — three connected justifications:
  • Why a bridge over implant or removable partial? Patient preference, contraindications to implant placement (medical, anatomic, financial), or adjacent abutments already needing crowns.
  • Why this tooth as a retainer (vs. cantilever or different abutment selection)? Crown-to-root ratio, periodontal support, restorability after caries/fracture removal, parallelism with other abutments.
  • Why full cast (D6790) over PFM (D6750) or all-ceramic (D6740)? Esthetics not a factor (posterior, low display), heavy occlusion / parafunction, prior porcelain fracture history, minimal tooth-reduction goal, patient preference, opposing-dentition wear concerns.
• Reason for tooth loss in the edentulous span — caries, periodontal disease, trauma, failed prior restoration, congenital absence; with extraction date(s) when known. Carriers ask why the patient is missing the tooth being replaced before they pay for the bridge.
• PDI / edentulism class — ACP Prosthodontic Diagnostic Index for partial edentulism (Class I-IV) summarizes case complexity in one line and is the cleanest narrative element when an alternate-benefit defense is needed.
• Pre-prosthetic workup — caries control, scaling/SRP/perio maintenance, endodontic treatment with adequate post-treatment healing, core buildup (D2950) or post and core (D2954) on the abutment when indicated. Each procedure billed under its own CDT code with its own date; the bridge and retainer codes follow once the abutments are prepared.
• Existing restoration on the abutment — material (amalgam, composite, prior crown), surfaces, condition (marginal integrity, recurrent caries, fracture lines), and approximate age. If replacing an existing crown, document why the existing crown is failing (open margin, recurrent caries, fracture, perforation, esthetic — though esthetic is rarely defensible for a posterior full-cast). Replacement crowns inside the carrier's frequency window need this narrative and commonly the prior crown's placement date.
• Diagnostic-quality preoperative radiograph — a current periapical (or panoramic showing the abutment region) showing the tooth being prepared, the edentulous span, and the opposing dentition; bone levels and any periapical pathology must be assessable. Carriers commonly require imaging not older than 6-12 months for a bridge predetermination. Label the image with tooth number and date.
• Material specification — D6790's defining element — explicitly state "full cast, high noble alloy" with the alloy name and composition (e.g., "Argelite 76SF: 76% Au, 11% Pd, balance Pt/Ag/Cu") so the chart and the lab metal certificate match. The metal certificate / casting alloy certification from the lab should be retained in the patient record and submitted with predeterminations on request. This is the single most common audit element for D6790.
• Tooth preparation specifics — preparation type (chamfer, shoulder, or feather-edge — full-cast gold tolerates a chamfer or knife-edge margin, which is one of its clinical advantages over ceramic), occlusal reduction (~1.0-1.5 mm functional cusps, ~0.5-1.0 mm non-functional), axial reduction, taper, finish-line location relative to gingiva (supragingival is preferred for full cast and easier to maintain).
• Records taken — final impression material (PVS light-body wash and medium-body tray, polyether) or scanner used (iTero, TRIOS, Primescan), opposing impression / scan, bite registration, shade (rarely relevant for full cast — note alloy color if relevant), face-bow if applicable.
• Provisional / temporary phase — temporary bridge fabricated (chairside bis-acryl, lab-processed PMMA, or shell-temp), cement used (non-eugenol provisional cement), occlusal and proximal contacts verified on the temp, patient instructions for the provisional period.
• Lab order — lab name, prescription number, written instructions (alloy, margin design, occlusal scheme, pontic design — sanitary/hygienic vs. modified ridge lap for posterior — connector size and location), estimated return date, and the metal certificate filed in the chart on receipt.
• Delivery findings — try-in fit before cementation (full seating verified visually and radiographically when needed, marginal integrity, proximal contacts with floss resistance, occlusion in centric and excursive movements), any adjustments made and where, isolation method (rubber dam preferred; cotton rolls acceptable), cement used (resin-modified glass ionomer, conventional zinc phosphate, or resin cement — full-cast gold is the most cement-tolerant of all crown materials), excess cement removed and verified radiographically when subgingival.
• Patient instructions — soft diet for first 24 hours, normal function thereafter, daily flossing under the pontic with floss threader or super-floss, expected longevity, expected adjustment-free service life, what to call about (loose feeling, soreness, occlusal issues).
• Consent / PARQ — alternatives reviewed (no treatment with eventual drift/extrusion, removable partial denture, single-tooth implant + crown, fixed bridge with PFM or all-ceramic retainers, full-cast bridge with base/noble alloys), risks (decementation, recurrent caries at margins, abutment endodontic complication, periodontal sequelae, eventual remake, opposing-tooth wear pattern is gentler than ceramic but still possible), patient's election, and that signed/verbal consent was obtained.
• Provider signature and any auxiliary operator initials on each visit's note.

Two recurring soft defects on D6790 specifically: (1) the lab metal certificate is missing or doesn't match the alloy stated in the chart (often because the lab substituted a noble or base alloy without notifying the office), and (2) the chart says "full cast crown" without specifying high noble — auditors then alternate-benefit to D6791 (base) or D6792 (noble) and the office cannot defend the upgrade without contemporaneous documentation.

Common denial reasons

The most frequent reasons D6790 is denied, downgraded, or recouped:

• Alternate benefit to D6791 (base) or D6792 (noble) — the dominant non-pure-denial pattern. PPO contract pays the high-noble retainer at the base or noble fee schedule because the contract treats high noble as a non-covered upgrade. Patient absorbs the gold-cost differential. This is almost always an alternate benefit, not a denial — the line is paid, just at a lower fee.
• Missing or mismatched lab metal certificate — claim audited and the chart cannot produce a casting alloy certificate showing ≥60% noble / ≥40% gold. Carrier retroactively alternate-benefits to D6791 or D6792 and recoups the differential.
• Same-tooth crown billed inside the carrier's 5-year frequency window without a narrative — the dominant pure-denial pattern. The replacement retainer typically becomes patient-pay or is written off.
• Missing tooth clause on the pontic — the tooth being replaced was extracted before the patient's effective date of coverage; the bridge is non-covered as a whole. Some carriers will process the retainers as single-tooth crowns (D2790) under the patient's crown benefit, but this requires resubmission and is not automatic.
• Untreated abutment pathology on submitted imaging — the abutment carries untreated caries, unresolved periapical pathology, failed endodontic treatment, or unaddressed periodontal disease. Delta Dental and UnitedHealthcare clinical policies list this as an explicit non-coverage criterion for fixed prosthodontics.
• Insufficient bone support / poor abutment prognosis — carrier reviewer determines the bridge will fail. Sometimes paired with a recommendation that the case would have been more defensible as extraction + removable partial or implant.
• Implant or removable partial would have been the more conservative option — carrier alternate-benefits the bridge fee to the lower of (a) a single-tooth implant + crown, or (b) a removable partial denture covering the same edentulous span. The patient absorbs the difference.
• Missing diagnostic imaging — no current PA or panoramic submitted with the predetermination or claim. Several carriers require imaging not older than 6-12 months for fixed prosthodontics.
• Single-tooth code billed instead of retainer code (or vice versa) — D2790 billed when the crown is part of a bridge, or D6790 billed when there is no pontic. Coding mismatch between the crown code and the bridge components is a common reason for a complete bridge claim to suspend.
• Billed on prep date instead of delivery date — claim denied for date-of-service mismatch with carrier's pay-on-cementation rule.
• Build-up (D2950) on the same date as the prep, billed without justification — many carriers bundle a same-date core buildup into the crown unless the chart documents that <50% of the tooth structure remained, that the buildup was structurally necessary (not just for resistance / retention form), and that the buildup material is distinct from the crown cement. This issue is identical for retainer crowns and single-tooth crowns.
• Provisional / temporary bridge billed separately as a definitive bridge — D6793 (interim retainer) was the appropriate code; D6790 was billed instead and the case is later remade.
• Default-template language in the chart — every retainer described as "fits passively, margins closed, occlusion adjusted" with no patient-specific findings. Auditors read this as filler and downgrade or recoup on post-payment review.
• Mixed-material bridge coding errors — the bridge has a PFM retainer on one end and a full-cast retainer on the other, but both are billed as D6750 or both as D6790. Each retainer should be coded by its own material; mixed-material bridges are clinically common and acceptable but require care in coding.

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