D3921Decoronation or

What This Code Covers

D3921 covers decoronation or. The crown of the tooth is removed while leaving the root in place, typically for ankylosed teeth in growing patients. This preserves alveolar bone volume during growth.

Billing Guide

Bill this code when:

• The procedure described by D3921 is performed and documented
• The clinical indication supports the procedure
• Documentation meets the payer's requirements for the service

Do not bill this code when:

• A different procedure was actually performed
• The procedure is included in another code being billed at the same visit
• Documentation does not support the medical necessity of the procedure
• The procedure is better described by D3910 (Surgical procedure for isolation of tooth with rub...)

Insurance and Denial Prevention

Key Payer Rules:

• Endodontic treatment is typically covered at 50-80% as a major service
• Some payers require pre-operative radiographs for approval
• Retreatment codes have different fee schedules than initial treatment
• Surgical endodontic procedures may require prior authorization

Common Denials and How to Respond:

• Not medically necessary - Submit radiographs showing the pathology and document the diagnosis and treatment rationale.
• Should be extraction - Provide documentation of why the tooth is restorable and worth saving.
• Bundled with final root canal - If this is an interim procedure, document separate dates of service and the clinical reason for staged treatment.