Path fx in neopltc dis, unsp ankle, subs for fx w malunion

This code describes a pathological fracture of an unspecified ankle bone that occurred due to an underlying neoplastic (cancerous) process. The "subsequent encounter" indicates the patient is receiving routine care during the healing phase of the fracture, and "malunion" specifies that the fracture has healed, but in an unsatisfactory or deformed position.

Use this code for follow-up encounters where a patient is being managed for an ankle fracture that resulted from cancer, and the fracture has healed improperly. Documentation should clearly state a pathological fracture due to neoplasm, specify the ankle as the affected site, indicate a subsequent encounter for fracture care, and explicitly mention malunion.

• Always sequence the underlying neoplasm code first, followed by this code.
• Ensure documentation specifies "pathological fracture" and the specific ankle bone if known (e.g., M84.571- for right ankle).
• Distinguish from nonunion (M84.4-) or routine healing (M84.6-).