D4266Guided Tissue Regeneration - Resorbable Barrier, Per Site

What This Code Covers

D4266 covers the placement of a resorbable barrier membrane during periodontal surgery to support guided tissue regeneration (GTR). The membrane is placed over a bone defect to prevent fast-growing soft tissue cells from filling the defect, allowing slower-growing bone and periodontal ligament cells to regenerate in the space. The resorbable membrane dissolves on its own and does not require a second surgery for removal. This code is billed per site in addition to the surgical code.

Billing Guide

Bill this code when:

• A resorbable barrier membrane is placed during periodontal surgery
• The membrane is used to guide tissue regeneration into an osseous defect
• The procedure is performed per site as an adjunct to flap or osseous surgery
• The membrane will dissolve on its own (resorbable type)

Do not bill this code when:

• A non-resorbable membrane is placed. Use D4267
• Bone graft material alone is placed without a membrane. Use D4263
• Biologic materials are applied without a membrane. Use D4265
• The membrane is placed around an implant, not a natural tooth. Use D6103 or D6104

Insurance and Denial Prevention

Key Payer Rules:

• D4266 is billed per site, not per quadrant
• Coverage varies by payer; some plans exclude GTR
• D4266 can be billed with D4263 (bone graft) and D4265 (biologic materials) when all are used together
• The membrane cost is included in D4266 (not billed separately)
• Documentation of defect morphology (three-wall or contained defects respond best) strengthens the claim

Common Denials and How to Respond:

• Not a covered benefit - Verify benefits before treatment. If denied, appeal with clinical literature supporting GTR for the specific defect type.
• Bundled with bone graft - D4266 and D4263 are separate procedures. The bone graft fills the defect; the membrane protects it. Appeal with documentation of both procedures.
• Not medically necessary - Submit radiographs showing the bone defect and clinical notes explaining why GTR is indicated for the defect morphology (contained defects with two or three walls).