D2940 Dental Code: Protective Restoration (Billing Guide 2026)

Reviewed by Morgan Heminger · Updated September 23, 2026

What Is D2940? (CDT Code Overview)

CDT code D2940 is the dental procedure code for placement of an interim direct restoration (previously named protective restoration): the temporary filling placed to relieve pain, promote healing or prevent further breakdown until definitive treatment. It belongs to the Restorative category of CDT codes (Other Restorative Services subcategory). If you need the ADA code for a temporary filling or an IRM filling, this is it; it is not meant for a base or liner under a final filling or for closing an endodontic access.

When Should You Use D2940?

The D2940 dental code for "protective restoration" applies when dentists place direct restorative materials to safeguard a tooth and preserve its function until definitive treatment becomes possible. This procedure code serves interim purposes rather than permanent solutions, such as protecting fractured teeth, covering endodontic access sites, or maintaining stability while patients wait for crowns or other final restorations. D2940 is suitable when the main objective involves tooth stabilization and prevention of additional damage or patient discomfort.

Quick reference: Use D2940 when the clinical scenario specifically matches protective restoration. Do not use this code as a substitute for related procedures in the same category. Consider whether D2910 (Re-cementing Inlays, Onlays and Veneers) or D2915 (Re-cementing Indirectly Fabricated Posts and Cores) might be more appropriate instead.

D2940 vs. Similar CDT Codes: Key Differences

Dental teams frequently confuse D2940 with other codes in the other restorative services range. Here is how D2940 differs from the most commonly mixed-up codes:

Documentation Requirements for D2940

Proper documentation remains essential for D2940 claim submissions. Dental staff must record clinical reasoning for protective restoration placement, noting tooth numbers, affected surfaces, and specific reasons temporary solutions were necessary. Typical situations include:

• Broken teeth needing stabilization prior to comprehensive treatment
• Teeth with missing restorations or decay exposing pulp tissue when immediate permanent restoration isn't feasible
• Post-endodontic cases where permanent restoration placement is postponed

Clinical records should clearly explain why protective restoration was selected instead of permanent treatment. Document pre-treatment and post-treatment photographs when available, and note any patient symptoms or hazards addressed through interim restoration placement.

Documentation checklist for D2940:

• Patient chief complaint and relevant medical/dental history clearly recorded.
• Clinical findings that support the use of D2940 specifically (not a more general or more specific code).
• Any diagnostic tests, imaging, or supplementary data that justify the procedure.
• Treatment plan with rationale connecting the diagnosis to the procedure coded as D2940.
• Post-procedure notes, including outcomes and follow-up recommendations.

For a deeper look at documentation best practices, see our guide on How Clinical Documentation Quality Drives Dental Claim Approvals.

Insurance and Billing Guide for D2940

For optimal reimbursement and reduced claim rejections with D2940, dental billing staff should implement these strategies:

1. Confirm Benefits: Prior to treatment, review patient insurance plans for interim or protective restoration coverage. Certain plans may restrict benefits or demand specific documentation requirements.
2. Provide Comprehensive Narratives: Include detailed explanations of clinical necessity when filing D2940 claims. Example: "Applied protective restoration to tooth #14 following significant fracture; permanent crown appointment scheduled within two weeks."
3. Include Supporting Documentation: Submit clinical photographs, x-rays, and treatment notes with claims. This evidence helps justify temporary treatment necessity and decreases denial probability.
4. Track EOBs and Accounts Receivable: Review benefit explanations quickly. When D2940 claims are rejected, examine documentation gaps and submit appeals with supplementary evidence when appropriate.

Keep in mind that D2940 isn't appropriate for permanent restorations or as replacement for codes like D2391 (single-surface posterior composite) or D2330 (anterior composite filling).

Common denial reasons for D2940: Lack of clinical documentation, frequency limitations exceeded, code mismatch with diagnosis, or missing prior authorization. When appealing a denied D2940 claim, include a detailed narrative explaining why the procedure was necessary, supporting clinical evidence, and relevant imaging or test results. Many practices find that well-documented first submissions dramatically reduce the need for appeals.

What major payers publish about D2940:

• UnitedHealthcare considers an interim restoration indicated to relieve pain, promote healing, prevent deterioration, retain tissue form or during disease control, but not as a liner or base, to close an endodontic access, for pulp capping or as a final filling (UnitedHealthcare Single Tooth Direct Restorations policy DCP023.15, May 2026).
• Delta Dental of Virginia covers D2940 for emergency relief of pain once per tooth. It is not billable with a definitive restoration, any restorative (D2000 to D2999), bridge (D6200 to D6699) or endodontic (D3220 to D3950) code by the same office on the same day, and when D2940 is paid, pulp caps (D3110, D3120) are not billable (Delta Dental of Virginia Participating Dentists' Handbook, 2026).

These are the payers' published policy documents; the patient's own plan can set different frequencies and alternate benefits, so confirm them during insurance verification.

To improve your overall claims workflow, explore Everything You Should Know About Dental Billing and Coding.

Real-World Case Example: Billing D2940

A patient presents requiring a procedure consistent with D2940 (protective restoration). The treating dentist documents the clinical findings, performs the procedure as indicated, and records detailed notes including the diagnosis, technique, and outcome. The billing team verifies insurance coverage, submits the claim with D2940 and supporting documentation, and follows up to ensure timely reimbursement. When the initial claim is processed, the practice reviews the Explanation of Benefits and addresses any discrepancies promptly.

Related CDT Codes to D2940

If you are researching D2940, you may also need to reference these related CDT codes in the other restorative services range and beyond:

• D2140: Amalgam Restoration Guide — Learn when to use D2140 and how it differs from D2940.
• D2150: Two-Surface Amalgam Restoration — Learn when to use D2150 and how it differs from D2940.
• D2330: Anterior Composite Restorations — Learn when to use D2330 and how it differs from D2940.
• D2331: Anterior Composite Restoration — Learn when to use D2331 and how it differs from D2940.
• D2391: Resin-based Composite Restorations — Learn when to use D2391 and how it differs from D2940.

Frequently Asked Questions About D2940

Can D2940 be submitted with other procedures during the same appointment?

D2940 may be billable with other procedures depending on the clinical circumstances and insurance provider policies. However, some carriers bundle D2940 with other restorative or emergency treatments performed on the same tooth during the same session, which could result in denial of separate payment. It's essential to verify patient benefits and review carrier guidelines prior to submitting claims for multiple procedures on the same tooth.

What is the maximum duration a protective restoration under D2940 should remain before permanent treatment?

Protective restorations coded as D2940 are designed as temporary measures. The appropriate timeframe for replacing these with permanent restorations depends on clinical assessment and patient factors, but generally spans from several days to a few weeks. Extended use beyond the temporary period may result in insurer inquiries or claim rejections. Be sure to document your planned definitive treatment schedule in the patient's clinical records.

Does D2940 receive the same reimbursement as permanent restoration codes such as D2391 or D2740?

D2940 typically receives lower reimbursement compared to permanent restoration codes like D2391 (single-surface posterior composite) or D2740 (crown). This difference reflects that D2940 represents a temporary rather than definitive treatment. Reimbursement amounts differ among insurance carriers and individual plans, making it crucial to confirm coverage details and anticipated payment before proceeding with treatment. Always verify with the specific insurance carrier, as policies and coverage rules can vary significantly between payers. Maintaining thorough documentation for D2940 will strengthen your position in any audit or appeal scenario.

What is the typical reimbursement range for D2940?

2026 Medicaid fee schedules give a public reference point for D2940: Medi-Cal Dental allows up to $45.00 (Medi-Cal Dental Schedule of Maximum Allowances, July 2026), Florida Medicaid pays $26.87 for patients under 21 (Florida AHCA Dental Fee Schedule, January 2026) and Texas Medicaid pays $37.05 for patients under 21 (Texas Medicaid (TMHP) THSteps dental fee schedule). D2940 is not a covered, separately priced service on the New York Medicaid fee schedule. Commercial PPO reimbursement depends on the payer contract, your region and network status, so the most reliable number for your practice is the allowed amount on your recent EOBs for D2940.

Does D2940 require prior authorization?

Prior authorization requirements for D2940 depend on the patient's specific insurance plan. Some carriers require advance approval for procedures coded under D2940, while others process claims without it. Best practice is to verify authorization requirements during insurance eligibility checks before the appointment. If prior authorization is required, submit the request with detailed clinical notes and supporting documentation to avoid delays in patient care and claim processing.