D3310Endodontic Therapy, Anterior Tooth (Excluding Final Restoration)

What This Code Covers

D3310 is the CDT code for a complete root canal on an anterior tooth, meaning an incisor or canine. The procedure involves removing infected or necrotic pulp tissue from the tooth, cleaning and shaping the root canal system, and filling it with a biocompatible material such as gutta-percha. Anterior teeth typically have a single canal, making this the most straightforward of the root canal codes. The final restoration, whether a crown or a core buildup, is not included and must be billed with a separate code.

Billing Guide

Bill this code when:

• The dentist performs a complete root canal on an incisor or canine tooth
• All phases of treatment are finished: access, instrumentation, and obturation
• The tooth is a permanent anterior tooth (not a primary tooth)
• Treatment was completed in one or multiple visits and is now fully finished

Do not bill this code when:

• The tooth being treated is a premolar or molar, so use D3320 or D3330 instead
• Only pulp capping or pulpotomy was performed, which has its own codes (D3110, D3120)
• The root canal was started but not completed, so bill D3331 (incomplete endodontic therapy) instead
• You are retreating a previously completed root canal, which requires D3346

Insurance and Denial Prevention

Key Payer Rules:

• Most PPO plans cover D3310 at 80% under major services after the deductible is met
• Some plans have a waiting period of 6 to 12 months for endodontic procedures on new members
• Medicaid coverage for adult root canals varies by state. Several states limit coverage to anterior teeth only, which actually works in favor of D3310 claims
• Many payers require preauthorization for endodontic therapy, especially on teeth with existing restorations

Common Denials and How to Respond:

• Tooth not restorable --> Submit a narrative explaining the tooth's restorability along with a periapical radiograph and clinical notes. Include the planned restoration code to show a treatment plan is in place.
• Missing preoperative radiograph --> Resubmit the claim with the preoperative X-ray attached. If the radiograph was taken at a previous visit, include that date of service and a note explaining the timeline.
• Frequency limitation (root canal already on file for this tooth) --> If this is a retreatment, recode to D3346. If the previous claim was billed in error by another office, submit documentation showing this is the initial treatment.