Summary & Overview
CPT 27457: Proximal Tibia and Fibula Osteotomy for Knee Realignment
CPT code 27457 identifies an open osteotomy procedure on the proximal tibia with partial fibular resection performed to correct knee deformity and redistribute joint load to a healthier compartment after skeletal maturity. Nationally, this code represents a key joint-preserving surgical option for patients with unicompartmental knee degeneration or angular deformities that contribute to symptomatic osteoarthritis. Its use affects surgical strategy, post-operative rehabilitation planning, and cost considerations across payers.
Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, common sites of service, and typical service type for 27457, plus benchmarking definitions and payer coverage patterns where available. The publication also summarizes coding context relevant to hospital and ambulatory surgical settings, potential implications for authorization and reimbursement workflows, and operational considerations for surgeons and billing teams.
Data not available in the input: associated taxonomies, specific ICD-10 diagnoses, related codes, and payer-specific negotiated rates. The piece is intended to inform clinicians, coding professionals, and policy analysts about the clinical and billing significance of CPT code 27457 at a national level.
Billing Code Overview
CPT code 27457 describes a surgical procedure that removes a portion of the tibia near the knee and a portion of the fibula to correct leg deformity and improve joint function. The operation is intended to shift weight-bearing from a damaged compartment of the knee to a healthier compartment, typically performed after skeletal growth is complete.
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Service type: Open orthopedic surgical procedure for realignment/osteotomy of the proximal tibia and fibula
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Typical site of service: Hospital operating room or ambulatory surgical center
Clinical & Coding Specifications
Clinical Context
A typical patient is an active adult in their 40s–60s with unilateral medial compartment knee osteoarthritis and varus malalignment who has failed conservative management (physical therapy, weight loss, bracing, corticosteroid or hyaluronic acid injections) and whose growth plates are closed. The patient presents with progressive focal knee pain, activity-related limping, and radiographs demonstrating asymmetric joint space narrowing on the medial tibiofemoral compartment.
Preoperative workflow includes clinical evaluation by an orthopedic surgeon (history, physical exam, weight-bearing knee radiographs, full‑length mechanical axis radiographs), shared decision‑making regarding joint-preserving osteotomy versus arthroplasty, informed consent, medical clearance, and perioperative planning (anesthesia assessment and postoperative rehabilitation plan). The operative procedure involves a controlled tibial osteotomy often combined with fibular osteotomy to allow realignment and gradual or acute correction of the mechanical axis so that weight bears on the healthier compartment. Postoperative care includes analgesia, DVT prophylaxis, activity restrictions, physical therapy, and radiographic follow-up to confirm alignment and healing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the procedure requires substantially greater work than typical (e.g., complex deformity, extensive releases or exposures). |