Osteitis deformans of unspecified lower leg

This code signifies Paget's disease affecting an unspecified bone in the lower leg. It represents a chronic bone disorder characterized by abnormal bone remodeling, leading to enlarged and weakened bones in this anatomical region.

Apply this code when documentation confirms Paget's disease (osteitis deformans) involving the lower leg, but the specific bone (e.g., tibia, fibula) is not identified. Supporting documentation would include physician notes detailing the diagnosis of Paget's disease with involvement of the lower extremity, without further anatomical specificity.

• Ensure the documentation explicitly states "unspecified lower leg" if a more precise site is not available.
• Avoid using this code if a specific bone in the lower leg (e.g., tibia, fibula) is documented; instead, use the more specific M88.86- subcategories.
• Consider sequencing this code with codes for associated complications, such as pathological fractures, if present.