D2394 is the CDT code for a resin-based composite restoration on a posterior tooth involving four or more surfaces. Posterior teeth are premolars and molars. All four surfaces must be documented individually in the clinical chart. This is the highest surface-count posterior composite code and carries more scrutiny than D2391 through D2393.
Get help with D2394 claims →Last updated June 2026 · Reviewed by the PracticeAlpha billing team
Extensive decay or a large failing restoration that involves four or more distinct surfaces of a premolar or molar. All surfaces must be in the preparation and restoration.
Mesial-occlusal-distal-facial-lingual and similar extended preparations on posterior teeth. Each surface must genuinely be part of the preparation boundary, not incidentally brushed.
When clinical judgment supports composite over full coverage. Document the rationale. Some reviewers will question whether a crown (D2740, D2750) is more appropriate for four-surface involvement.
Do NOT use D2394 for: Anterior teeth, even canines in some plan interpretations (use D2335 for anterior four-surface or incisal angle). Three-surface posterior composites (use D2393). Posterior amalgam restorations (use D2140, D2150, or D2160). Situations where the preparation genuinely involves fewer than four surfaces.
D2394 claims draw more scrutiny than lower-surface composite codes because four or more surfaces implies extensive tooth destruction. Reviewers look for pre-operative radiographs that show matching extent of decay or failing restoration. Clinical notes must name each surface. If the x-ray shows a small Class II lesion and you billed D2394, the claim will be questioned.
Many plans reimburse posterior composites at the amalgam benefit rate regardless of surface count. This applies to D2394 just as it does to D2391 through D2393. The claim is paid at a lower reimbursement. Inform patients before treatment when their plan has a posterior composite downgrade policy. Document that conversation in the chart.
Some payers will question whether a four-surface posterior composite is appropriate or whether a crown is the indicated treatment. A claim may be downgraded, denied, or sent for review. A strong clinical narrative explaining why composite is the preferred treatment approach in this case, and why full coverage is not required, reduces that risk.
Replacement restorations on the same tooth within a plan's frequency window will be denied. Check the patient's history. When a replacement is clinically necessary before the frequency limit, submit a narrative with the pre-operative radiograph and a description of failure mode (recurrent decay, fracture, secondary caries under existing restoration).
The chart entry must list every surface in the preparation. Abbreviations are fine in a consistent charting system, but the surfaces must be countable and match the claim.
A periapical or bitewing showing the extent of decay or the failing restoration. The radiographic picture should be consistent with a four-surface preparation.
If the clinical record can support why composite was chosen over full coverage, include it. This preempts plan reviewer questions about treatment necessity and appropriateness.
For four-surface posterior composites, photos showing the pre-operative condition add objective evidence that is hard to dispute. Include them whenever available.
If the plan pays posterior composites at amalgam rates, document that the patient was informed and accepted potential balance due before treatment began.
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Learn about our billing servicesD2394 is the CDT code for a resin-based composite restoration on a posterior tooth covering four or more surfaces. All surfaces must be documented in the clinical chart. Posterior teeth are premolars and molars.
D2393 covers three surfaces on a posterior tooth. D2394 covers four or more surfaces. The surface count in the clinical chart determines the correct code. Billing D2394 for three surfaces is upcoding.
D2394 is for four-surface composites on posterior teeth. D2335 is for four-surface composites or incisal angle restorations on anterior teeth. Tooth position (anterior vs. posterior) determines the code family.
Common reasons: surface count not supported by radiographs or notes, plans questioning whether a crown is more appropriate, frequency limitations, and posterior composite downgrades to amalgam reimbursement.
Yes. Four-surface posterior composites imply extensive tooth destruction and attract more scrutiny. Pre-operative radiographs, detailed notes, and intraoral photos are important to support the claim.
Yes, but document why composite was chosen. Some plans will question or downgrade a four-surface posterior composite without a clear rationale for why full coverage was not used.
Search all CDT codes in our dental coding guide.