Summary & Overview
CPT 27709: Tibia and Fibula Osteotomy for Deformity Correction
CPT code 27709 identifies a surgical osteotomy of the tibia and fibula performed to correct lower‑extremity deformities such as malunion, limb‑length discrepancy, valgus (knock‑knee) or varus deformities. This operative code is clinically significant because it addresses structural abnormalities that affect gait, joint alignment and long‑term function, with implications for surgical resource use, postoperative rehabilitation and potential payer authorization requirements. Key payers in national analyses typically include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare.
Readers will find a concise clinical and billing profile of CPT code 27709, including typical settings of care, common modifiers and the payer mix represented in conventional coverage discussions. The publication covers benchmark considerations for utilization and reimbursement, important coding and documentation elements that influence coverage decisions, and the clinical context that justifies the procedure. It also highlights areas where policy updates or prior‑authorization rules commonly affect access and payment workflows. Data not available in the input are noted where applicable.
Billing Code Overview
CPT code 27709 describes an operative procedure in which the provider incises a segment of the tibia and fibula to correct deformities such as malunion of fracture, unequal leg length, valgus deformity (outward bending of the knee), or varus deformity (inward bending of the knees toward the midline of the body).
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Service type: Surgical orthopedic procedure for realignment and deformity correction of the lower leg
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Typical site of service: Hospital inpatient or outpatient surgical setting, ambulatory surgery center, or specialty orthopedic surgical suite
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult presenting to an orthopedic surgical practice with symptomatic lower‑extremity deformity following trauma or growth disturbance. For example, a 34‑year‑old patient with persistent tibial malunion after a closed tibial fracture reports progressive varus deformity of the lower leg, leg‑length discrepancy of 2.5 cm, and knee malalignment causing pain and functional limitation. After conservative management (physical therapy, orthotics) fails and radiographs/CT confirm a segmental angular and/or length deformity of the tibia and fibula, the orthopedic surgeon schedules an operative corrective tibial and fibular osteotomy.
The clinical workflow includes preoperative evaluation (history, focused lower‑extremity exam, full‑length standing radiographs and CT for deformity analysis), informed consent, preoperative medical clearance, and templating for osteotomy level and any fixation method. Intraoperatively, the provider makes an incision through the tibia and fibula segment to perform the osteotomy/realignment with appropriate fixation (plates, screws, or external fixation). Postoperative care includes inpatient monitoring as indicated, pain control, physical therapy, weight‑bearing instructions, and interval radiographic follow‑up to document healing and alignment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When procedure performed on the left tibia/fibula |