Fx unsp tarsal bone(s) of left foot, subs for fx w nonunion

This code signifies a fracture of one or more tarsal bones in the left foot where the bone fragments have failed to heal together after a period of time, and the patient is presenting for follow-up care related to this nonunion. It indicates an ongoing problem with bone healing in the midfoot or hindfoot region.

This code is appropriate for encounters where a patient with a previously diagnosed left tarsal bone fracture is being evaluated or treated for a confirmed nonunion. This includes visits for surgical planning, cast changes, physical therapy, or medication management specifically addressing the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the left foot.
• Verify that this is a subsequent encounter for the fracture, not the initial treatment.
• If the specific tarsal bone is known, a more specific code should be used instead.