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

This code signifies a fracture of the left humerus that occurred due to an underlying neoplastic process, and the patient is presenting for follow-up care where the fracture has healed incorrectly (malunion). The neoplastic disease has weakened the bone, leading to the pathological fracture.

Apply this code when a patient with a documented neoplastic disease presents for ongoing management of a left humeral fracture that has healed in a misaligned position. Documentation should clearly state "pathological fracture," "left humerus," "malunion," and indicate a "subsequent encounter" for this specific fracture.

• Ensure the documentation specifies "malunion" and not "nonunion" (M84.422P).
• Always sequence the underlying neoplastic disease code first, followed by this code.
• Verify the laterality (left humerus) is explicitly stated in the medical record.