Oth fx third MC bone, left hand, subs for fx w nonunion

This code signifies a fracture of the third metacarpal bone in the left hand that is not healing properly, as documented during a follow-up visit. "Nonunion" indicates that the bone fragments have failed to unite after a sufficient healing period, potentially requiring further intervention.

Apply this code when a patient presents for ongoing management of a previously diagnosed left third metacarpal fracture where nonunion has been identified. This would be used for subsequent encounters after the initial treatment of the fracture.

• Ensure documentation clearly specifies "nonunion" and the specific metacarpal bone (third) and laterality (left).
• This code is for subsequent encounters; use the appropriate initial encounter code for the first visit.
• Always review the full encounter documentation to confirm the fracture site, laterality, and healing status.