D2940 Dental Code: Interim Direct Restoration Billing

What D2940 reports

D2940 reports the placement of an interim direct restoration: a temporary restoration placed directly in the tooth to protect the tooth and surrounding tissue, relieve symptoms, and hold the situation until a definitive restoration can be done. The code covers the chairside work of placing that interim material.

After the CDT 2025 revision, the scope is deliberately broad. D2940 captures any restorative material placed as an interim restoration, by any method, on any tooth, as long as the provider is acting within their scope of licensure. There is no separate code for the material used or the dentition involved. One code does the job.

What it is not:

• A definitive restoration. The final filling has its own code based on material, surface count, and tooth position (for example D2140 for a one-surface amalgam or D2391 for a one-surface posterior composite). D2940 is the temporary that precedes the definitive work, not the definitive work itself.
• A base or liner under a restoration. Material placed beneath a permanent restoration as a base or liner is part of that restoration, not a separately reportable interim restoration.
• Endodontic access closure. Sealing an endodontic access opening is part of the endodontic procedure, not a D2940.
• Palliative treatment. Pain relief that does not involve placing a restoration is D9110, not D2940. See the distinction below.

The CDT 2025 rename: same code, broader meaning

If you learned this code as the “protective restoration” or, going further back, the “sedative filling,” the number has not changed but the official name has. CDT 2025 revised the nomenclature from “protective restoration” to “placement of interim direct restoration.”

The rename traveled with a deletion. The ADA also deleted D2941, the old code for an interim therapeutic restoration on primary teeth, and folded that work into D2940. Instead of one code for permanent teeth and a separate code for baby teeth, there is now a single interim-direct-restoration code that covers both dentitions.

The practical takeaway: you still submit D2940. What changed is that the code now covers more ground, so there is no longer a reason to reach for a primary-dentition variant or to treat the material as the deciding factor.

Same-day bundling: the main billing trap

The single most common D2940 billing problem is placing it on the same tooth, the same day, as the definitive treatment. When that happens, most carriers treat the interim restoration as a component of the definitive procedure and deny the D2940 line as inclusive.

The logic is straightforward from the carrier’s side. If the tooth was restored to completion that day, the interim restoration was a step within that restoration, not a separate service. So the plan pays for the definitive code and pays nothing extra for the D2940. On many plans, the bundled amount is also not billable to the patient, because it is considered part of a service the plan already covered.

Some plans that do reimburse a standalone D2940 also expect a gap between the interim restoration and the definitive restoration before they will pay both, sometimes a month or more. That is plan-specific. Treat the time gap as a coverage condition to verify, not a universal rule.

D2940 versus D9110

These two get confused because both can show up at an emergency or problem-focused visit, but they report different things.

D2940 (placement of an interim direct restoration) answers: did you place interim restorative material in the tooth? The work is packing a temporary restoration into the tooth to protect it and hold it until the definitive restoration.

D9110 (palliative treatment) answers: did you relieve pain or discomfort without a more specific procedure code applying? Typical examples are adjusting a sore spot, smoothing a sharp fractured edge, or opening a tooth to relieve pressure, where no restoration was placed.

The distinguishing axis is whether an interim direct restoration went into the tooth. Placed temporary restorative material, it is D2940. Relieved the problem without placing a restoration, it is D9110. Code the procedure you actually performed, and write the chart note so the code and the documentation tell the same story. A reviewer who sees D2940 with a note that describes only pain relief, or D9110 with a note describing a temporary filling, has a reason to question the claim.

When to bill D2940

Bill D2940 when you place an interim direct restoration and the definitive restoration is not completed on that tooth the same day. Common situations:

• Deep caries near the pulp. You excavate decay, place an interim restoration, and want to monitor the tooth’s response before committing to a definitive restoration or root canal.
• An emergency or problem-focused visit. The patient presents with a broken-down or symptomatic tooth, you stabilize it with an interim restoration, and schedule the definitive treatment for a later appointment.
• Caries control across multiple teeth. You place interim restorations to control active decay before finalizing a treatment plan and phasing the definitive work.

Do not bill D2940 for:

• A definitive filling. Use the restorative code that matches material, surfaces, and tooth position.
• A base or liner placed under a permanent restoration on the same visit.
• Sealing an endodontic access opening, which is part of the endodontic procedure.
• Pain relief with no restoration placed. Use D9110.

Documentation that supports the claim

D2940 lives or dies on whether the chart shows it was a genuine interim step, not a same-day component of finished work. The note should capture:

• The tooth and the clinical reason. Tooth number plus why an interim restoration was the right call: deep caries near the pulp, a symptomatic tooth being monitored, active decay being controlled before definitive treatment.
• That it was interim, not definitive. State that the restoration is temporary and that the definitive restoration is planned for a later visit. This is the line that separates a clean standalone D2940 from a bundled same-day claim.
• What you placed. The interim restorative material and that it was placed directly in the tooth.
• The plan for the definitive restoration. The intended next step and, where relevant, the expected timeframe, which also helps on plans that require a gap before they will pay both procedures.

For the claim, a one-line narrative noting that the restoration is interim and the definitive treatment is scheduled separately helps the carrier process it against the right benefit on plans that cover a standalone interim restoration.

Top reasons D2940 gets denied

Four issues account for most denials:

1. Bundled into same-day definitive treatment. D2940 was billed on the same tooth and date as a permanent restoration, endodontic procedure, or other definitive work. The carrier denies it as inclusive. This is the most common single denial reason and it is the carrier’s stated policy, not an error to appeal.
2. Plan excludes interim restorations. Some plans simply do not cover interim restorations as a separate benefit. The denial is plan language, not a coding error.
3. Frequency or time-gap rule. On plans that pay both the interim and the definitive restoration, the definitive work came too soon after the D2940 for the plan’s gap requirement. The carrier denies one of the two for timing.
4. Deleted-code carryover. A claim still going out under D2941 for a primary tooth bounces as an invalid code. Retire D2941 and submit D2940.

What to get right in your PMS

The menus differ across Open Dental, Dentrix, Eaglesoft, Curve, and Carestream, but the setup that prevents problems is the same:

1. Update the description to the current name. Relabel D2940 as the interim direct restoration in your code table so the front desk and billing team are not still picking it as a “protective restoration” or “sedative filling” without understanding the broadened 2025 scope.
2. Remove D2941 from the table. It was deleted in CDT 2025. Leaving it active invites someone to pick it for a primary tooth and trigger an invalid-code rejection.
3. Watch for same-day stacking at posting. If D2940 and a definitive restoration land on the same tooth and date, flag it before the claim goes out. On most plans the D2940 will bundle, and stacking the two is the fastest path to an inclusive denial.
4. Note the interim intent at point of care. A chart note that says the restoration is temporary, with the definitive treatment planned for a later visit, is what defends a standalone D2940 if the claim is reviewed.