Pathological fracture, unsp foot, subs for fx w malunion

This code signifies a pathological fracture of an unspecified foot bone that is currently undergoing treatment for malunion. A pathological fracture occurs due to a weakened bone structure, not from excessive trauma. Malunion indicates that the fracture has healed in an unsatisfactory position, leading to functional impairment or deformity.

Apply this code when a patient presents for follow-up care, such as cast changes, physical therapy, or surgical intervention, for a pathological foot fracture that has healed improperly. Documentation should clearly state "pathological fracture," specify "foot" (when a more specific site is not documented), and indicate "malunion" as the current healing status during a subsequent encounter.

• Ensure documentation explicitly states "pathological fracture" and "malunion" for accurate code assignment.
• Verify the encounter type is "subsequent encounter" (P) as opposed to initial or sequela.
• If the specific foot bone is known (e.g., metatarsal, tarsal), use a more specific M84.47- subcategory.