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

This code signifies a fracture involving one or more tarsal bones in an unspecified foot that has failed to heal properly, resulting in a nonunion. The patient is presenting for follow-up care related to this persistent nonunion.

Apply this code when a patient is seen for ongoing management of a previously diagnosed tarsal bone fracture in an unspecified foot that has not united. This includes situations where surgical intervention for nonunion is being planned or has already occurred, or when conservative management for nonunion is continuing.

• Ensure documentation clearly states "nonunion" of a tarsal fracture and specifies the encounter as subsequent.
• If the specific tarsal bone is known, a more precise code from the S92.2 series should be used.
• Always sequence this code after the primary reason for the encounter, if applicable.