Disp fx of base of unsp MC bone, subs for fx w malunion

This code indicates a fracture at the base of an unspecified metacarpal bone that has healed incorrectly, resulting in a malunion. The fracture was displaced at the time of injury, and the patient is now presenting for follow-up care related to this improperly healed bone.

Apply this code when documenting a patient encounter for ongoing management or treatment of a malunited fracture at the base of a metacarpal bone, where the specific metacarpal (e.g., thumb, index) is not documented. This is appropriate for subsequent visits after the initial treatment of the fracture, focusing on the complications of malunion.

• Ensure documentation clearly states "malunion" and that the fracture was displaced.
• Only use this code when the specific metacarpal bone involved is not specified in the medical record.
• This code is for subsequent encounters; do not use for the initial treatment of the acute fracture.