Summary & Overview
CPT 27730: Distal Tibial Epiphysiodesis for Leg-Length Equalization
CPT code 27730 represents a surgical epiphysiodesis of the distal tibia performed to halt tibial growth and prevent limb-length discrepancy. This technique is clinically important in pediatric orthopedics to equalize leg length during growth and to avoid long-term gait abnormalities, functional impairment, or secondary joint problems. Nationally, the code is relevant for surgical utilization, coverage policy, and quality measurement in pediatric musculoskeletal care.
Key payers included in the coverage analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical intent and typical service settings for CPT code 27730, plus the context needed for assessing coverage considerations, common modifier usage, and coding relationships. The publication summarizes benchmarks and policy-relevant points (where available) and outlines the clinical indications and operational setting readers should consider when identifying this service on a claim.
This executive summary is designed for national audiences including providers, billing professionals, and payers who need a concise reference to CPT code 27730’s clinical purpose, service context, and where to look for further documentation or payer-specific guidance.
Billing Code Overview
CPT code 27730 describes a surgical procedure that fuses the end plates of the lower tibia to interrupt further growth of the tibial bone. The procedure is performed to prevent the tibia from growing longer than the fibula of the same leg or the tibia of the opposite leg during a patient’s growth phase, with the clinical goal of equalizing leg length as the patient matures.
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Service type: Pediatric orthopedic growth modulation surgery
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Typical site of service: Inpatient or outpatient surgical setting (operating room) depending on patient age and surgical planning
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Clinical & Coding Specifications
Clinical Context
A 12-year-old patient presents to pediatric orthopedics with progressive limb-length discrepancy of the lower extremities noted during growth monitoring and confirmed by standing long-leg radiographs and clinical measurement. The child has a shorter fibula-to-tibia mismatch on the affected side causing apparent tibial overgrowth relative to the contralateral limb and is approaching remaining growth potential that would worsen the discrepancy. The surgeon plans a distal tibial epiphysiodesis to arrest growth of the tibial distal physis and allow the fibula and contralateral tibia to equilibrate during remaining growth.
Preoperative workflow includes clinic evaluation, informed consent, preoperative imaging (standing alignment and bone age assessment), anesthesia evaluation, and scheduling in an ambulatory surgery center or hospital operating room under general anesthesia. Intraoperative steps include fluoroscopic localization of the distal tibial physis, surgical exposure, physeal plate fusion (temporary or permanent per technique), hemostasis, and wound closure. Postoperative workflow includes recovery room monitoring, weight-bearing instructions (often protected or partial weight bearing), activity restrictions, outpatient follow-up with serial radiographs to monitor leg-length symmetry, and documentation of growth arrest success and any complications such as infection or hardware issues.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side |