Major osseous defect, left lower leg

This code signifies a significant structural deficiency in the bone of the patient's left lower leg, often resulting from trauma, infection, tumor resection, or congenital anomaly. It indicates a substantial loss of bone tissue that compromises the structural integrity and function of the tibia or fibula.

Apply this code when documentation explicitly states a "major osseous defect" or describes a large bone void in the left lower leg requiring significant reconstructive efforts. This is typically supported by imaging reports (X-ray, CT, MRI) detailing the size and location of the defect, and operative reports outlining bone grafting or other reconstructive procedures.

• Ensure laterality (left) and anatomical site (lower leg) are clearly documented.
• Distinguish from minor bone defects or nonunion, which have separate codes.
• Code any underlying cause of the defect (e.g., fracture, osteomyelitis) as a primary diagnosis if applicable.