Orthognathic and TMJ Surgery Coding: Osteotomies and Joint Procedures
Orthognathic and TMJ surgery are medical (CPT) procedures — distinct from the dental (CDT) side of OMFS — payable when functional or skeletal criteria are documented.
Orthognathic osteotomies
- 21141–21147 — Le Fort I osteotomy, by number of pieces and grafting
- 21193–21196 — mandibular (sagittal split) osteotomy, with/without fixation and grafts
- 21120–21123 — genioplasty, by extent and augmentation
A bimaxillary case reports the maxillary and mandibular osteotomies together with -51 on the secondary. Document the malocclusion, skeletal discrepancy, and functional impairment supporting medical necessity.
TMJ procedures
- 20605 — TMJ arthrocentesis
- 29800 / 29804 — TMJ arthroscopy, diagnostic / surgical
- 21240–21243 — TMJ arthroplasty, including prosthetic joint replacement
Diagnostic TMJ arthroscopy bundles into surgical arthroscopy at the same session. Total joint replacement uses the prosthesis code, not a stack.
Clinical Capture codes each osteotomy site distinctly, applies the TMJ bundling logic, and flags services that belong on the dental claim.
This article is educational and not coding, billing, or legal advice. Always verify codes and values against the current CPT®, ICD-10-CM, and CMS Physician Fee Schedule, follow NCCI edits and payer policy, and confirm with a certified coder before submitting a claim. Document only work that was actually performed.