Understanding Dental Code D3347

When to Use D3347 dental code

The D3347 dental code refers to the retreatment of previous root canal therapy in a molar tooth. This CDT code is used when a previously treated root canal requires additional endodontic intervention due to persistent infection, new pathology, or failure of the initial treatment. It is critical to use D3347 only for molars and only when the original root canal therapy was completed and documented. If the retreatment is for a premolar or anterior tooth, refer to the appropriate codes (D3346 for anterior teeth and D3348 for premolars).

Documentation and Clinical Scenarios

Accurate documentation is essential for successful billing and insurance reimbursement for D3347. The clinical record should include:

• Detailed patient history and symptoms indicating failure of the previous root canal
• Radiographic evidence (pre- and post-op images) showing pathology or incomplete healing
• Description of the initial treatment and the reason for retreatment
• Step-by-step notes on the retreatment procedure, including any complications or additional findings

Common clinical scenarios include persistent periapical radiolucency, new pain or swelling, or discovery of missed canals. Always ensure the previous root canal was performed on a molar and that the need for retreatment is clearly justified in the chart.

Insurance Billing Tips

To maximize reimbursement and minimize claim denials for D3347, follow these best practices:

• Verify patient benefits: Confirm endodontic retreatment coverage and frequency limitations before scheduling the procedure.
• Submit comprehensive documentation: Include clinical notes, diagnostic images, and a narrative explaining the failure of the initial root canal.
• Use correct coding: Ensure D3347 is used only for molars and that the tooth number matches the clinical documentation.
• Appeal denied claims: If the claim is denied, review the EOB for the reason, supplement with additional documentation, and submit a clear, concise appeal letter referencing the necessity of retreatment.

Proactive communication with insurance representatives and thorough AR follow-up can further reduce delays in payment.

Example Case for D3347

A 45-year-old patient presents with pain and swelling in the lower right molar, previously treated with root canal therapy two years ago. Radiographs reveal a persistent periapical lesion. The dentist documents the patient’s symptoms, reviews the original treatment notes, and obtains new diagnostic images. After discussing options, the dentist performs retreatment, thoroughly charting each step and outcome. The billing team verifies the patient’s insurance, submits the claim with D3347, attaches supporting documentation, and follows up on the claim status. The claim is approved, and payment is posted to the patient’s account, demonstrating an effective workflow for D3347 billing.