Path fx in oth disease, oth site, subs for fx w nonunion

This code signifies a pathological fracture, meaning a fracture caused by an underlying disease rather than trauma, occurring at an unspecified "other site" in the body. The "subsequent encounter" indicates the patient is receiving routine care during the healing phase, and "nonunion" specifies that the fracture has failed to heal completely after a reasonable period.

Use this code for follow-up visits where a patient is being treated for a pathological fracture at a site not otherwise specified, and the fracture has not united. Documentation should clearly state the pathological nature of the fracture, the specific "other site" (e.g., sternum, patella), and explicitly mention nonunion.

• Always sequence the underlying disease causing the pathological fracture first.
• Ensure documentation specifies "nonunion" for this code; otherwise, a different subsequent encounter code for pathological fracture may be more appropriate.
• Avoid using this code if a more specific site code for pathological fracture and nonunion is available (e.g., M84.65_K for femur).