D4266 Dental Code: Guided Tissue Regeneration Billing Guide

What D4266 covers

D4266 reports placing a resorbable barrier membrane at a periodontal defect around a natural tooth. The membrane holds space over the defect and keeps fast-growing soft tissue out so bone, cementum, and attachment can regenerate underneath. Resorbable means the body breaks it down, so there is no follow-up surgery to retrieve it. The code is reported per site.

What matters for the claim is how narrow that is. D4266 reports the barrier and only the barrier. The published descriptor explicitly carves out the surrounding work, which is the ADA’s way of saying each piece is billed on its own line:

• The flap. Opening the site and closing it is not in D4266. Where the surgery included osseous recontouring, that is D4260 or D4261 by tooth count per quadrant.
• The bone graft. The graft material placed in the defect around a retained natural tooth is D4263 for the first site in the quadrant and D4264 for each additional site.
• Biologic material. Enamel matrix derivative, platelet concentrates, and similar regenerative agents are D4265, per site.
• Wound debridement and osseous contouring, when those were separately performed.

So a single regenerative surgery frequently generates three or four lines. Dropping the D4266 line because the membrane “came with the graft” gives away the barrier fee on every case.

Three regenerative materials, three codes

The three periodontal regeneration codes are separated by what physically went into the defect, not by how severe it was or what the surgeon was trying to achieve.

• D4263 and D4264 report the bone replacement graft, the particulate that fills the bony defect. Neither is reported at an edentulous space or an extraction site.
• D4265 reports biologic material, per site, used alone or alongside a graft and a membrane.
• D4266 and D4267 report the barrier membrane that covers the site.

Each of the three descriptors states that it does not include the other two. Read them together and the rule is simple: bill what was placed, one code per material, and let the note carry the detail.

Which GTR code: site family first, then barrier

Guided tissue regeneration is coded by where the membrane went before anything else. Get the site family wrong and the barrier type still matches, so a number check passes and the claim is still wrong.

Question one: what was the membrane placed against?

• Natural tooth: D4266 (resorbable) or D4267 (non-resorbable).
• Implant: D6106 (resorbable) or D6107 (non-resorbable), reported per implant.
• Edentulous site, meaning no tooth and no implant there, including a socket where the tooth was just extracted: D7956 (resorbable) or D7957 (non-resorbable), reported per site.
• In conjunction with periradicular surgery: D3432, the resorbable-barrier code that lives with the endodontic surgery family.

Question two: which membrane? Within the natural-tooth pair, D4266 is the resorbable barrier and D4267 is the non-resorbable one that has to be removed later.

The removal code D4286 exists, but it is not a routine second line. Cigna’s 2026 DPPO guidelines treat it as part of the primary guided tissue regeneration service, grouped with D4267, D6107, and D7957. Northeast Delta Dental splits it by who does the removal: not billable to the patient when the office that placed the barrier removes it, denied when a different office removes it. Both stances are plan-specific, so the useful habit is knowing which side of that line a case falls on before the barrier goes in.

When to bill D4266

1. Was a barrier membrane actually placed? Not a graft alone, not biologic material alone. If no membrane went in, there is no D4266.
2. Was it resorbable? Resorbable is D4266. Non-resorbable is D4267, and the later removal usually rides with it.
3. Is there a natural tooth at the site? A membrane at an implant is D6106, at an edentulous ridge is D7956, and alongside periradicular surgery is D3432.
4. Is the tooth staying? A membrane placed at a site where the tooth is coming out is not a D4266. The edentulous-area codes cover a barrier placed after an extraction, so that membrane is D7956 or D7957. The graft under it is its own line, D7953 for ridge preservation in the fresh socket or D7950 for ridge augmentation, and both of those descriptors direct the membrane to be reported separately.
5. Count the sites. One D4266 per membraned defect, with each location named in the narrative.
6. Build the other lines. The flap or osseous surgery, the graft, and any biologic material each get their own code on the same claim.

Coverage and how carriers treat it

Guided tissue regeneration is a reviewed benefit almost everywhere. Two published policies show the shape of it, and both are worth reading before you submit rather than after the EOB posts.

A defect threshold. Cigna’s 2026 DPPO coverage determination guidelines allow D4266 and D4267 when the pocket around a natural tooth measures 5 mm or deeper and bone loss is present, and disallow the codes when pockets are under 5 mm or the radiographs do not show bone loss. Thresholds vary by carrier and plan, but a documented pocket depth with a matching radiograph is the baseline evidence any reviewer looks for.

A defect type. UnitedHealthcare’s dental barrier membrane policy indicates guided tissue regeneration for intrabony and infrabony vertical defects and Class II furcation involvements, and alongside bone grafting for ridge preservation, ridge augmentation, implant placement, and peri-implant defects. The same policy lists what it does not consider indicated, including teeth with a poor or hopeless prognosis, osseous defects with fewer than two walls, crater defects, and periapical lesions of endodontic origin. That list is a useful pre-submission read, because a membrane at a hopeless tooth or a shallow crater is a predictable denial regardless of how good the note is.

Site exclusions. Cigna disallows the code at the same site as a tooth removal, where no natural tooth is present, at the same site as an apicoectomy, hemisection, root amputation, or other periradicular surgery, at the same site and date as an implant placement, and at an existing implant. Those are the site-family errors above, showing up as denials.

A retreatment window. Cigna treats a repeat GTR by the same office at the same tooth or site within 36 months as non-billable to the patient. Frequency language like this is plan-specific, but the pattern is common, so check the site history before rebilling a redo.

Documentation that supports the claim

The narrative has to answer the reviewer’s questions before they are asked:

• The site and the tooth number, with the defect described. A vertical or intrabony defect, or a furcation with its grade, is what most policies are written around.
• Pocket depth and bone loss, from the periodontal charting and a current radiograph of the site. This is the evidence that clears a 5 mm threshold.
• The membrane type, stated as resorbable, so D4266 is defensible against D4267.
• The other materials placed, each named separately: graft material for the D4263 or D4264 line, biologic agent for D4265. Lines that are documented separately survive review separately.
• Prognosis. A tooth documented as maintainable answers the poor-or-hopeless-prognosis exclusion before it becomes a denial.
• The site count, with every membraned location itemized so the number of D4266 lines matches the operative note.

What to get right in your PMS

The menus differ across Open Dental, Dentrix, Eaglesoft, Curve, and Carestream, but the setup is the same:

1. Keep the graft, the biologic, and the barrier as three separate procedures. If the fee schedule blurs them into one regenerative line item, the practice bills one code for a surgery that earned three.
2. Label the GTR codes by site family, not just “membrane.” D4266 and D4267 for natural teeth, D6106 and D6107 for implants, D7956 and D7957 for edentulous sites. A pick list that reads “GTR resorbable” three times guarantees a wrong pick eventually.
3. Set D4266 to bill per site with no additional-site logic. Templates built off the D4263 and D4264 quadrant pattern will collapse a two-site membrane case into one line.
4. Attach charting and the radiograph automatically. The pocket depth and the bone loss are the coverage test on most plans, so make them part of the claim rather than a response to a request for records.
5. Surface prior surgery at the site. Before rebilling a redo, someone has to know when a membrane was last placed on that tooth. If your system can flag prior perio surgery by tooth, use it.

For how the tooth numbers, quadrants, and remarks field are filled in on the claim itself, see the ADA dental claim form guide.