D2392 Dental Code: Two-Surface Posterior Composite

The short version

D2392 is the CDT code for a resin-based composite restoration that covers two surfaces of a posterior tooth. The operative note should name both surfaces and show that the restoration crosses from one surface to the other. Payers sometimes reduce a documented D2392 to a one-surface benefit, which changes both reimbursement and patient balance.

Bill D2392 for one posterior composite restoration involving exactly two named tooth surfaces.
D2391 covers one posterior composite surface. D2150 covers a two-surface amalgam restoration.
The ADA reported a case where a payer reduced a continuous proximal-to-buccal or lingual D2392 restoration to a one-surface benefit and challenged that interpretation.
A 2026 Delta Dental Texas schedule lists an $80 adult copayment for D2392 and no pediatric D2392 benefit, while D2150 carries a $30 copayment.
In a worked PPO example, a $275 fee becomes a $210 allowable. The plan pays $168 at 80%, the patient owes $42, and the office adjusts $65.
Record the tooth, both surfaces, continuity of the preparation and restoration, diagnosis, material, and preoperative condition.

What is D2392?

D2392 reports a direct resin-composite restoration on two surfaces of a premolar or molar. It's one procedure on one tooth.

Fact	D2392
CDT category	Restorative
Unit	Per tooth
Material	Resin-based composite
Tooth area	Posterior
Surface count	Exactly two
Public fee examples	Washington Medicaid listed $72.24 for adults; South Carolina listed $118 for children in its 2025 schedule

The tooth and surface fields carry the coding decision. “Posterior composite” alone isn't enough because the payer can't distinguish D2391, D2392, D2393, or D2394 from that phrase.

When do you bill D2392?

Bill D2392 when one completed composite restoration occupies two reportable surfaces on a posterior tooth.

Identify the tooth as a premolar or molar.
Name both surfaces, such as MO, DO, OB, or OL.
Confirm that restorative material reaches each named surface.
Record whether decay, fracture, or replacement of a failed restoration led to treatment.
Submit one D2392 line rather than splitting a continuous restoration into two D2391 lines.

Separate lesions can still produce one two-surface restoration if the preparation and material join. If the dentist places two truly separate restorations on distinct surfaces, the current CDT manual and payer guidance should be checked for the correct reporting because claim systems may combine same-tooth restorative lines.

D2392 vs D2391 and D2150

Surface count separates the composite codes. Material separates D2392 from the comparable amalgam code.

The posterior composite family follows the completed surface count from D2391 through D2394.

	D2391 one-surface composite	D2392	D2150
Material	Resin composite	Resin composite	Amalgam
Surfaces	One	Two	Two
Example	O	MO, DO, OB, or OL	Two-surface amalgam pattern
Washington adult Medicaid fee	$59.97	$72.24	Check current schedule

The ADA's multisurface restoration report describes a restoration that extended from a proximal surface to the buccal or lingual surface without interruption. The dentist reported D2392, while a Delta member company paid a single-surface code. The ADA asked the payer to align its interpretation with the completed two-surface restoration.

Don't solve that dispute by changing the note after the EOB.

What does insurance actually do with D2392?

Posterior resin coverage can depend on age and product. A 2026 Delta Dental Texas plan lists D2392 as no pediatric benefit and an $80 adult copayment. Its two-surface amalgam D2150 carries a $30 copayment. A Delta California pediatric schedule covers D2392 with its own copayment and tooth-history limits. Read the actual plan rather than applying one carrier rule across products.

A $275 D2392 charge becomes a $210 allowable, with $168 from the plan, $42 from the patient, and a $65 adjustment.

Office fee: $275
Contracted allowable: $210
Contractual adjustment: $65
Plan payment at 80%: $168
Patient coinsurance: $42

Why does D2392 get denied?

The claim names one surface even though the code requires two.
The payer treats the second extension as part of the first surface and downcodes D2392 to D2391.
The same tooth or surface was restored inside the plan's replacement period.
The plan excludes posterior composite or calculates a lower material benefit.
The operative note, image, and claim surface fields don't match.

The ADA says downcoding changes the submitted procedure to a lower-paying code.

What documentation gets D2392 paid?

Record the tooth number and both exact surface abbreviations.
State the diagnosis and whether the service replaced an existing restoration.
Describe the preparation extending across the line angle when that establishes the second surface.
Identify resin composite as the restorative material.
Keep a preoperative image and an intraoral photo when either supports the extent.
Compare the EOB procedure code with the submitted D2392 before posting.

Common questions about D2392

Is an MO composite D2392?

Yes, when the completed posterior composite occupies the mesial and occlusal surfaces. Record both surfaces on the claim and in the operative note. The same logic applies to DO, OB, OL, and other valid two-surface combinations. The final surface count, not the number of increments or shades, decides whether D2392 fits.

Can you bill two D2391 lines instead of D2392?

Don't split one continuous two-surface restoration into two one-surface procedures. D2392 describes that completed work. Separate restorations on the same tooth need careful review under the current CDT manual and payer editing rules, with the operative note showing that they were truly distinct.

What should the office do when D2392 is paid as D2391?

First confirm the claim carried two surfaces. Then ask the payer for the exact basis of the code change. Appeal with the operative note and image showing both surfaces. Don't post the difference to the patient until the contract and EOB show whether the reduction is a plan limitation or an error.

Can the plan pay an amalgam benefit for D2392?

Some products limit posterior resin or make the patient's resin copayment higher than the amalgam copayment. The office still reports the composite placed. Verify whether the contract permits an alternate material benefit and whether the difference can be charged to the patient.

Compare the claim with the operative note

Don't file D2392 until you've matched both restored surfaces to the tooth and operative note. If the EOB doesn't name both surfaces, don't post it. The team can't review a change that isn't explained.

Sources

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