Path fracture in oth disease, r ulna, subs for fx w malunion

This code signifies a fracture of the right ulna that occurred due to an underlying disease process, not trauma, and is currently being treated for a malunion. A malunion indicates that the fracture has healed, but in an unsatisfactory or deformed position. This code is used during follow-up care for this specific complication.

This code is appropriate for subsequent encounters when a patient is receiving ongoing treatment or evaluation for a malunited pathological fracture of the right ulna. Documentation should clearly state the presence of a malunion, the specific bone involved (right ulna), and that the original fracture was pathological in nature. This code is used after the initial treatment of the fracture.

• Always ensure documentation specifies "pathological fracture" and the laterality (right ulna).
• Distinguish from nonunion (M84.4-) where the fracture has not healed at all.
• Requires an additional code to identify the underlying disease causing the pathological fracture.