Fx unsp metatarsal bone(s), l foot, subs for fx w nonunion

This code signifies a fracture affecting one or more of the metatarsal bones in the left foot, where the bone fragments have failed to heal together after an initial treatment. The "subsequent encounter" indicates that the patient is receiving ongoing care for this previously diagnosed fracture, and "nonunion" specifies the complication of impaired healing.

This code is appropriate for documenting follow-up visits, evaluations, or treatments for a left metatarsal fracture that has not united. It should be used when a physician is managing the nonunion, such as considering surgical intervention, bone grafting, or continued conservative management after the initial treatment period.

• Always sequence this code after the primary diagnosis for the reason for the encounter (e.g., pain, follow-up).
• Ensure documentation clearly specifies "left foot" and "nonunion" for metatarsal fractures.
• Do not use this code for initial fracture treatment or for fractures that are healing normally.