Path fx in neopltc dis, r humerus, subs for fx w malunion

This code signifies a fracture of the right humerus that occurred due to an underlying neoplastic process, such as a tumor. The fracture has healed improperly, resulting in a malunion, and the patient is currently receiving follow-up care for this complication.

Use this code when documentation indicates a patient is being treated for a malunited pathological fracture of the right humerus, and the fracture was caused by a neoplasm. This code is appropriate for subsequent encounters where the focus is on the ongoing management or complications of the malunion.

• Always sequence the underlying neoplasm code first, followed by this code.
• Ensure documentation clearly specifies "right humerus" and "malunion" for accurate code assignment.
• Distinguish from nonunion (M84.4-) or routine follow-up without malunion (M84.521D).