Path fx in oth disease, unsp ankle, subs for fx w malunion

This code signifies a fracture of an unspecified ankle that occurred due to an underlying disease process, not trauma. The patient is in a subsequent phase of care for this fracture, and it has healed improperly, resulting in malunion. This indicates ongoing management of a complicated healing process.

Use this code for follow-up encounters where a patient is being treated for an ankle fracture that developed secondary to a systemic condition (e.g., osteoporosis, bone tumor), and the fracture has healed in an anatomically incorrect position. Documentation should clearly state "pathological fracture," "malunion," and specify the ankle as the affected site, even if laterality is not noted.

• Ensure documentation specifies "pathological fracture" and "malunion" for accurate code assignment.
• This code requires a seventh character "P" for subsequent encounter with malunion; do not use "K" (nonunion) or "D" (routine healing).
• Always code the underlying disease responsible for the pathological fracture first, followed by this code.