Path fx in neopltc disease, l ankle, subs for fx w nonunion

This code signifies a pathological fracture of the left ankle that occurred due to an underlying neoplastic disease. The fracture has failed to heal properly, resulting in a nonunion, and the patient is receiving subsequent care for this unhealed fracture.

Apply this code when documentation clearly indicates a left ankle fracture caused by a tumor or malignancy, and the fracture has not united. This code is appropriate for follow-up encounters where the nonunion is being actively managed, such as for cast changes, follow-up imaging, or surgical planning for nonunion repair.

• Always sequence the underlying neoplastic disease code first, followed by this code.
• Ensure documentation specifies "left ankle" and "nonunion" for accurate coding.
• Distinguish from malunion (M84.472K) which implies healing in an unsatisfactory position, versus nonunion where healing has not occurred.