D6605Retainer Inlay - Cast Predominantly Base Metal, Three or More Surfaces

What This Code Covers

D6605 covers retainer inlay - cast predominantly base metal, three or more surfaces. The retainer is the anchor portion of a fixed partial denture that cements onto the prepared abutment tooth. Material type and coverage determine the specific code.

Billing Guide

Bill this code when:

• A retainer inlay - cast predominantly base metal, three or more surfaces is fabricated and cemented on the prepared tooth
• The number of surfaces matches the code description
• The material type matches the code specification

Do not bill this code when:

• The surface count or material does not match this code
• A direct restoration was placed instead of an indirect restoration
• The restoration was placed on an implant abutment. Use the appropriate D6xxx code
• The procedure is better described by D6600 (Retainer inlay - porcelain/ceramic, two surfaces)

Insurance and Denial Prevention

Key Payer Rules:

• Fixed prosthodontic procedures are typically covered as major services
• Implant coverage varies widely by plan. Many plans exclude implants entirely
• Material downgrades may apply (high noble to base metal)
• Prior authorization is commonly required for implant and bridge procedures

Common Denials and How to Respond:

• Implants not covered - Check if the medical plan covers implants when the dental plan does not. Submit a detailed treatment narrative.
• Material downgrade - Bill the actual material placed and inform the patient of any balance due to plan downgrades.
• Missing tooth clause - Some plans exclude replacement of teeth that were missing before the plan effective date. Verify plan terms.