Summary & Overview
CPT 21145: LeFort I Midface Reconstruction with Maxillary Advancement
CPT code 21145 denotes LeFort I midface reconstruction with maxillary advancement using microsurgery and bone grafting to correct congenital or acquired deformities. This major craniofacial procedure is clinically important for restoring facial form, dental occlusion, and airway function, and it carries implications for surgical planning, facility resources, and payer coverage decisions across the United States. Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the procedure and service setting, an overview of payer coverage patterns and common modifiers, and contextual clinical considerations relevant to authorization and claims submission. The publication highlights benchmarks for site-of-service utilization, typical reimbursement considerations, and policy updates that influence coverage and coding practice. It also outlines issues commonly encountered on claims for complex craniofacial reconstructive surgery, including bundling, documentation expectations, and the role of multidisciplinary teams. Data not available in the input is noted where applicable; the content focuses on national-level clinical and billing context rather than state-specific rules.
Billing Code Overview
CPT code 21145 describes surgical reconstruction of the midface using microsurgery and bone grafting during a LeFort I osteotomy. The procedure involves mobilizing and advancing the maxilla (the upper jaw bone) and associated facial bones to correct congenital or acquired deformities and to reposition the teeth-bearing portion of the maxilla.
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Service type: Major craniofacial reconstructive surgery involving osteotomy, bone grafting, and microsurgical techniques
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Typical site of service: Inpatient or outpatient hospital operating room or specialized ambulatory surgical center where complex maxillofacial reconstructive procedures are performed
Clinical & Coding Specifications
Clinical Context
A 24-year-old patient with a congenital maxillary hypoplasia and malocclusion presents for orthognathic correction. The patient has functional issues (class III malocclusion, difficulty chewing, airway obstruction during sleep) and cosmetic concerns. Preoperative planning includes orthodontic alignment, 3D imaging (CT scan), and surgical planning with maxillofacial and orthodontic teams. On the day of surgery in an inpatient or ambulatory surgical center setting, the patient undergoes a LeFort I osteotomy with mobilization of the maxilla, microsurgical bone grafting as needed, rigid internal fixation with plates and screws, and possible intermaxillary fixation. The procedure is typically performed by an oral and maxillofacial surgeon or a plastic and reconstructive surgeon with microvascular expertise, often in a hospital operating room or an ambulatory surgical center equipped for complex craniofacial surgery. Postoperative care includes monitoring in a PACU or inpatient unit for airway and bleeding concerns, pain control, antibiotics, and a coordinated plan with orthodontics for occlusal stabilization and follow-up visits for wound checks and radiographic assessment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the procedure requires substantially greater effort, time, or technical difficulty (extensive bone grafting, complex fixation). |