Path fx in oth disease, l femur, subs for fx w malunion

This code signifies a fracture of the left femur that occurred due to an underlying disease process, not trauma, and is currently being treated for a complication where the bone fragments have healed in an incorrect anatomical position. This malunion is observed during a follow-up visit after the initial treatment of the pathological fracture.

Apply this code when documentation clearly indicates a pathological fracture of the left femur, and the patient is presenting for ongoing care or evaluation of a malunion. The encounter must be subsequent to the initial fracture treatment, and the malunion must be explicitly documented as a current issue.

• Ensure documentation specifies "pathological fracture" and the specific bone (left femur).
• Verify that the encounter is for follow-up care of the fracture and explicitly mentions "malunion."
• Do not use for nonunion (M84.4-) or for initial encounters for the fracture.