Major osseous defect, left ankle and foot

This code signifies a significant structural deficiency or loss of bone tissue in the left ankle and/or foot. This defect is substantial enough to be considered "major," implying a significant impact on the bone's integrity and function. It can result from trauma, infection, tumor resection, or congenital anomalies.

Apply this code when documentation clearly indicates a major osseous defect affecting the left ankle or foot. This includes conditions like large bone cysts, extensive osteomyelitis leading to bone loss, or significant post-traumatic bone gaps. Supporting documentation should detail the size, location, and etiology of the defect.

• Ensure the documentation specifies "major" to differentiate from minor defects.
• Always confirm laterality (left) is clearly documented.
• Code any underlying cause of the osseous defect (e.g., osteomyelitis, fracture nonunion) as a primary or secondary diagnosis.