Coding for Composite Fillings in 2026

April 13, 2026

Coding for direct restorations has been under scrutiny for years.

This isn’t new.

Multi-surface restorations have long been a focus area for post-payment review and audit activity because they’re commonly performed and frequently reimbursed. Most discrepancies occur when submitting an “upcoded” claim — defined by the ADA as reporting a more complex and/or higher cost procedure than was actually performed. 

Multi-Surface Reporting and Audit Risk

As reimbursement increases with surface count, so does scrutiny. 

Multi-surface restorations, particularly 3+ surface composites, are more likely to be compared against provider-level reporting patterns to identify outlier behavior associated with fraud, waste, and abuse. A mismatch between treatment provided and what was reported on the claim form is exactly what payor analytics are designed to detect.

At the beginning of the Restorative category of service in the Explanation of Restorations table, CDT 2026 notes that restorations are described as “Placed, without interruption.” The CDT 2026 Coding Companion further emphasizes that dentists must document what they do. Reporting a single restoration when two separate, noncontiguous restorations were placed creates a discrepancy between:

• the patient record,
• claim submission, and
• clinical condition of the tooth.

While most payors will combine these separate restorations for reimbursement purposes, it remains important to always “code for what you do.”

It’s also important to note that almost all insurance plans deny coverage of restorations performed purely for cosmetic reasons. For example, when reporting multi-surface anterior fillings to close a diastema or cover discolorations, it’s both ethical and a contractual obligation to disclose when restorations are placed that are not due to decay or fracture. In these cases, the patient will generally be responsible for the entire contracted fee.

What Changed in 2026?

Code D2391 was revised in CDT 2026 to provide consistency with other resin restoration codes.

The updated descriptor eliminates language specifying the status or depth of the carious lesion, allowing providers to accurately report one-surface posterior resin-based composite restorations regardless of lesion depth or diagnosis. No other restorative code is defined or restricted by lesion depth, which previously created inconsistencies in reporting similar procedures.

This revision also resulted in the deletion of code D1352 (preventive resin restoration). 

Previously, preventive resin restorations placed where decay had not extended into dentin may have been reported using D1352. Its deletion now allows restorative treatment of an early lesion on the occlusal surface of a posterior tooth to be reported as D2391. 

Failure to update reporting protocols when CDT codes are deleted will result in claim delays and denials.

Aligning What You Do With What You Report

As payor review processes continue to evolve, consistency between clinical findings, treatment performed, and code selection remains one of the most important safeguards against avoidable claim review. 

Coding what you do (and documenting why) helps ensure accurate documentation in the patient’s record and on the dental claim form, supporting more efficient claims processing.

For complete CDT guidance on direct restorations and the 2026 updates, including the revised reporting for one-surface posterior composites, Practice Booster’s Dental Coding with Confidence remains a trusted resource.

If your team needs support reducing denials tied to restorative coding, surface-count discrepancies, or evolving payor scrutiny, eAssist’s dental billing professionals combine proven experience with AI-enhanced workflows to help keep documentation aligned with claim submission, reduce audit risk, and keep payments moving. Schedule a consultation to see how eAssist can strengthen your dental billing workflows and help your practice collect what it has rightfully earned.

Disclaimer: Insurance administration and dental billing recommendations presented here represent the opinions of the author or our staff and are for informational purposes only. You are responsible for your own use of the CDT Codes, insurance administration, and dental billing. For the latest CDT codes and official interpretations, contact the American Dental Association or visit ADA.org.