Pathological fracture, right fibula, subs for fx w malunion

This code signifies a fracture of the right fibula that occurred due to an underlying disease process, rather than trauma. It specifically indicates that the patient is receiving follow-up care for this pathological fracture, and the fracture has healed improperly, resulting in a malunion.

Use this code for patients presenting for ongoing treatment of a previously diagnosed pathological fracture of the right fibula, where imaging or clinical assessment confirms malunion. Documentation should clearly state the pathological nature of the fracture, the anatomical site, and the current encounter as subsequent care for a malunited fracture.

• Always sequence this code after the underlying disease causing the pathological fracture (e.g., osteoporosis, neoplasm).
• Distinguish from nonunion (M84.463N) or routine healing (M84.463D, M84.463S).
• Ensure documentation specifies "right fibula" and "malunion" for accurate code assignment.