Major osseous defect, left forearm

This code signifies a significant structural deficiency or loss of bone tissue in the left forearm. This defect is substantial enough to be considered "major," often resulting from trauma, infection, tumor resection, or congenital anomalies, impacting the integrity and function of the radius and/or ulna.

Apply this code when documentation clearly indicates a large-scale bone defect in the left forearm, requiring significant reconstructive efforts or impacting biomechanical stability. Supporting documentation includes operative reports detailing bone graft procedures, imaging reports (X-ray, CT, MRI) describing the extent of bone loss, and physician notes specifying "major osseous defect."

• Ensure laterality (left forearm) is explicitly documented.
• Distinguish between a major defect and a simple fracture or nonunion; this code implies significant bone loss.
• Code any underlying cause of the defect (e.g., osteomyelitis, tumor) in addition to this code, following sequencing guidelines.