Incomplete atypical femoral fracture, left leg, 7thP

This code signifies an incomplete stress fracture of the left femur, specifically an atypical femoral fracture (AFF), that is currently undergoing treatment for a malunion. An AFF is a rare but serious type of stress fracture, often associated with long-term bisphosphonate use, characterized by a transverse or short oblique fracture line in the subtrochanteric region or femoral shaft. The "incomplete" designation indicates the fracture does not extend through both cortices of the bone.

Use this code for a patient presenting for follow-up care of a previously diagnosed incomplete atypical femoral fracture of the left leg, where the fracture has healed in an unsatisfactory position (malunion). Documentation should clearly state "incomplete atypical femoral fracture," specify the left leg, and indicate ongoing management for a malunion during a subsequent encounter. This code is appropriate when the patient is no longer in the initial healing phase but is still receiving care for the fracture's complications.

• Ensure documentation explicitly states "incomplete atypical femoral fracture" and specifies "left leg."
• Verify the encounter is for a "subsequent encounter" and that "malunion" is documented as the reason for ongoing care.
• Distinguish from nonunion (M84.452P) or other types of femoral fractures; atypical femoral fractures have specific diagnostic criteria.