D2330 is the CDT code for a tooth-colored composite filling on one surface of a front tooth, meaning an incisor or canine.
- When to use: A composite filling on one surface of a front tooth (teeth 6 to 11 or 22 to 27).
- When not to use: Two surfaces is D2331, three is D2332, four or more is D2335, and back teeth start at D2391.
- Billing note: Since CDT 2024 the incisal angle is not a surface, so it never moves a filling to D2335.
What D2330 covers
D2330 reports a resin-based composite restoration covering one surface of an anterior tooth (incisor or canine). The surface can be the facial, lingual, mesial, distal, or incisal. The code includes the material, placement, shaping, and finishing. The code is set by surface count, material (composite), and tooth type (anterior).
Bill it when an anterior tooth has a carious lesion, fracture, or failing restoration involving exactly one surface, restored with composite. The most common cases are a small facial composite (a smooth-surface lesion or an old facial filling) and a lingual composite behind an upper incisor.
It does not cover:
- Two-surface anterior composites. Use D2331, even if the second surface was small.
- Three-surface anterior composites. Use D2332.
- Four-or-more-surface anterior composites. Use D2335.
- Composites on posterior teeth (premolars and molars). Use D2391 (one surface), D2392 (two surfaces), D2393 (three surfaces), or D2394 (four or more).
- Indirect restorations, veneers, or crowns on anterior teeth.
- A restoration the practice intends to follow with a crown, where a buildup is the real procedure.
The surface-count rule
Anterior teeth have five countable surfaces: mesial (M), distal (D), facial or labial (F), incisal (I), and lingual (L). A one-surface restoration involves exactly one of them. The number of surfaces restored sets the code, not chair time or the amount of material.
The incisal is the one that trips people up. It is the biting edge of an anterior tooth, and it counts as a surface the same way the occlusal does on a back tooth. A restoration confined to the incisal alone is one surface and codes as D2330.
The incisal angle is not a surface
This is the most misreported detail in the anterior family, and the same logic carries through D2331, D2332, and D2335.
Before CDT 2024, D2335 was defined as four or more surfaces or involving the incisal angle. The ADA dropped the incisal-angle clause. The incisal angle is the corner where the incisal edge meets the mesial or distal surface, and a corner is not a tooth surface. A claim reports only surfaces, using the single letters M, D, F, I, L.
Involving the incisal angle therefore no longer forces D2335. Count the surfaces restored and pick the matching code. A chip at the corner of a central incisor restored across the incisal and facial is two surfaces, D2331, even though it involves the incisal angle.
Top reasons D2330 gets denied or repriced
- Surface-count miscoding. D2330 billed on a two-surface restoration underbills the work (it should be D2331). D2331 billed on what was really one surface is downcoded to D2330.
- Frequency limit on the same surface. Most plans pay one restoration per tooth surface per benefit period. A facial composite on a tooth that had a facial composite a year ago may pend. A narrative documenting the new clinical reason (recurrent decay, fracture, failed margin) helps.
- No documented clinical indication. Some carriers audit restorations on teeth that looked sound at the last recall. The chart should name the caries, fracture, or failing restoration.
- Posterior code on an anterior tooth, or the reverse. A D2391 billed on tooth 8, or a D2330 billed on tooth 14, is a mismatch the carrier will catch. Configure the PMS so D2330 cannot post on a posterior tooth number.
Documentation that supports the claim
The claim needs the date of service, the tooth number (an anterior tooth, 6 through 11 or 22 through 27), and a single-letter surface designation from M, D, F, I, L.
In the patient record, document:
- The clinical reason: caries on a named surface, fracture, or a failing existing restoration.
- The surface restored.
- The material used.
- Shade and any liner or base, if relevant.
A note that reads only “composite #9” does not pass audit.
D2330 versus the posterior one-surface code
D2330 and D2391 sit in the same place in their families. The split is tooth position, not technique.
- D2330 is a one-surface composite on an anterior tooth (incisor or canine).
- D2391 is a one-surface composite on a posterior tooth (premolar or molar).
The CDT 2026 cycle revised D2391 to drop its old restriction to lesions penetrating into dentin, so it now covers any one-surface posterior composite regardless of lesion depth. D2330 was not revised. The two are still separated by tooth position and nothing else.
Example case
A 29-year-old patient presents with a small carious lesion on the facial of tooth 9, a maxillary central incisor, caught at recall. The dentist confirms the lesion and places a single-surface composite on the facial.
Billing steps:
- Verify benefits and confirm anterior composite is covered at the composite allowable.
- Place the composite. One surface: F.
- Submit D2330 with surface designation F on the date of service.
- The carrier processes at the D2330 allowable. Anterior composite is rarely downgraded, so the patient owes only any coinsurance or deductible.
If the tooth had a facial composite placed within the plan’s frequency window, the claim may pend. Submit a narrative documenting the new clinical reason.
FAQs
- What's the difference between D2330, D2331, D2332, and D2335?
- Surface count. All four are anterior composite codes: D2330 is one surface, D2331 two, D2332 three, and D2335 four or more. The anterior surfaces are mesial (M), distal (D), facial or labial (F), incisal (I), and lingual (L). The incisal plays the same counting role on an anterior tooth that the occlusal plays on a posterior tooth.
- Does the incisal angle make a one-surface restoration into a D2335?
- No. The ADA removed the incisal-angle language from D2335 effective CDT 2024, because the incisal angle is not a tooth surface. Count the surfaces actually restored. A restoration that involves the incisal angle but touches only one surface is still D2330.
- Which teeth are anterior for these codes?
- The incisors and canines, roughly teeth 6 through 11 on the upper arch and 22 through 27 on the lower. Premolars and molars are posterior and use the D2391 through D2394 series. Coding an anterior composite with a posterior code, or the reverse, gives the carrier a clean reason to reject or reprice the claim.
- Will a plan downgrade D2330 to amalgam like it does on posterior composites?
- Rarely. Alternate-benefit downgrades to amalgam are mostly a posterior issue, because amalgam was never an esthetic choice on front teeth, so most plans pay anterior composite at the composite allowable. A small number still apply unusual benefit logic, so confirm the specific plan.
Related codes
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CDT codes are maintained by the American Dental Association. This page is an editorial billing guide, not the official ADA code descriptor. Verify current coverage policies with each carrier before submitting claims.