Path fx in oth disease, r fibula, subs for fx w malunion

This code signifies a pathological fracture of the right fibula that has developed a malunion. A pathological fracture occurs due to a weakened bone structure caused by an underlying disease, rather than trauma. Malunion indicates that the fracture has healed, but in an unsatisfactory position or alignment.

Use this code for a patient presenting for follow-up care of a previously diagnosed right fibula pathological fracture that has healed with malunion. This applies when the patient is receiving ongoing treatment, monitoring, or evaluation for the malunion, and the initial fracture treatment has concluded. Documentation should clearly state "pathological fracture," "right fibula," "malunion," and indicate a "subsequent encounter."

• Ensure documentation specifies the underlying disease causing the pathological fracture, which should be coded first.
• Distinguish from nonunion (M84.4-) or routine follow-up of a healed fracture without malunion (Z87.810).
• Verify laterality (right fibula) and the encounter type (subsequent encounter for fracture with malunion).