Oth fx fourth MC bone, left hand, subs for fx w malunion

This code indicates a fracture of the fourth metacarpal bone in the left hand that is currently healing with an unsatisfactory alignment of the bone fragments. This malunion is being addressed during a follow-up visit after the initial treatment of the fracture.

Use this code for a patient presenting for ongoing care of a previously treated left fourth metacarpal fracture where imaging or clinical assessment confirms malunion. This applies to situations where the malunion itself is the focus of the encounter, such as for evaluation, planning for corrective surgery, or monitoring.

• Ensure documentation specifies "left hand" and "fourth metacarpal."
• Confirm the encounter is for a "subsequent" visit and that "malunion" is present.
• Do not use for initial fracture treatment or for nonunion (which has a different code).