Summary & Overview
CPT 25420: Forearm Osteotomy and Autogenous Bone Grafting for Radius and Ulna
CPT code 25420 defines an operative reconstruction for nonunion or malunion of the radius and ulna that includes osteotomy and fixation with autogenous bone grafting. This procedure addresses complex forearm deformities that impair function and can require substantial operative time, specialized orthopedic techniques, and postoperative rehabilitation. Nationally, procedures coded with 25420 are relevant to orthopedic trauma care, reconstructive surgery performance measurement, and payer coverage policies for surgically managed forearm nonunions.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will gain an overview of the clinical intent of the code, typical settings where the service is delivered (hospital operating room or ambulatory surgical center), and the kinds of benchmarks and policy considerations that commonly accompany high-complexity reconstructive orthopedic procedures. The publication summarizes common billing practice elements, common modifiers used with surgical procedures when available, and what to expect in claims adjudication and documentation reviews.
This analysis provides clinical context for coding and billing teams, health plan analysts, and hospital revenue cycle staff to understand when 25420 should be used, how it aligns with surgical service types, and where to look for policy details and utilization benchmarks. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 25420 describes a surgical procedure to correct nonunion or malunion deformities of the radius and ulna by performing osteotomy (cutting and realigning the bones) and stabilizing the reconstruction using autogenous bone grafts harvested from the patient. The procedure is focused on restoring alignment, stability, and function of the lower arm when previous fractures have healed improperly or failed to heal.
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Service type: Surgical reconstruction, open reduction with bone grafting for forearm bones
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Typical site of service: Inpatient or outpatient hospital operating room, or ambulatory surgical center depending on clinical complexity and anesthesia requirements
Clinical & Coding Specifications
Clinical Context
A typical patient is a 25–50 year-old adult who presents with persistent forearm pain, deformity, and loss of function months to years after an initial radius/ulna fracture that failed to heal (nonunion) or healed in a malaligned position (malunion). The patient reports decreased forearm rotation, wrist pain, and sometimes neurovascular symptoms. Imaging (plain radiographs and CT) confirms a symptomatic nonunion or malunion of the distal or mid-shaft radius and/or ulna with shortening, angulation, or rotational deformity. Conservative care (immobilization, bone stimulation, or limited trial of bracing) has been attempted and failed.
Preoperative workflow includes an orthopaedic or hand surgery consultation, review of prior imaging, templating for osteotomy and fixation, and planning for autogenous bone graft harvest (commonly from the iliac crest). Pre-op labs and medical clearance are obtained as indicated. Intraoperatively the surgeon performs corrective osteotomy(ies) of the radius and/or ulna, debrides nonunion tissue, places structural or cancellous autograft, and stabilizes the segments with internal fixation (plates/screws) or intramedullary devices as appropriate. Postoperative care includes immobilization, serial radiographs to monitor union, physical therapy for range of motion/strengthening, and potential staged hardware removal if indicated.
Typical site of service: hospital outpatient surgery center or inpatient hospital depending on comorbidity and complexity. Service type: orthopaedic reconstructive surgery (open reduction, osteotomy with autogenous bone grafting).
Coding Specifications
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