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

This code signifies a fracture of the left humerus that occurred due to an underlying disease process, rather than trauma. The fracture has healed in an unsatisfactory position (malunion), and the patient is presenting for follow-up care related to this malunion.

Use this code for a patient encounter where the primary focus is the ongoing management or evaluation of a malunited pathological fracture of the left humerus. Documentation should clearly indicate a pre-existing disease contributing to the fracture and evidence of malunion during a subsequent visit.

• Ensure documentation specifies "pathological fracture" and the underlying disease.
• Verify laterality (left humerus) and the encounter type (subsequent encounter for malunion).
• Always code the underlying disease responsible for the pathological fracture first, followed by this code.