Pathological fracture, unsp ankle, subs for fx w malunion

This code signifies a pathological fracture of an unspecified ankle that is currently healing with malunion. A pathological fracture occurs due to an underlying disease weakening the bone, rather than from trauma alone. Malunion indicates that the fracture has healed in an unsatisfactory position, potentially leading to functional impairment.

Apply this code when a patient presents for follow-up care of a previously diagnosed pathological ankle fracture that has healed incorrectly. Documentation should clearly state "pathological fracture," "malunion," and specify the ankle (though "unspecified" is used here if laterality isn't documented). This code is appropriate for subsequent encounters where the malunion is being addressed or monitored.

• Ensure documentation explicitly states "pathological fracture" and "malunion" for the ankle.
• Verify the encounter is "subsequent" for the fracture; initial encounters or sequelae would use different codes.
• If the specific ankle (right or left) is documented, a more specific code should be used.