Osteitis deformans of left lower leg

This code identifies Paget's disease of bone specifically affecting the left lower leg. It signifies a chronic bone disorder characterized by abnormal bone remodeling, leading to enlarged, weakened, and deformed bones in this particular anatomical site.

Apply this code when documentation confirms a diagnosis of Paget's disease localized to the left tibia or fibula. Supporting clinical evidence typically includes imaging findings (e.g., X-rays, bone scans) showing characteristic lytic and sclerotic lesions, elevated alkaline phosphatase levels, and a physician's definitive diagnosis.

• Ensure laterality is clearly documented as "left lower leg" to support this specific code.
• Do not confuse with other bone disorders like osteomyelitis or osteomalacia, which have distinct ICD-10-CM codes.
• Code any associated pathological fractures or other complications of Paget's disease separately.