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

This code signifies a previously treated fracture of the long, central part of an unspecified metacarpal bone that has healed incorrectly, resulting in a malunion. The fracture was displaced at the time of the initial injury, meaning the bone fragments were not properly aligned. This code is used during a subsequent encounter for the ongoing management of this malunited fracture.

Use this code when a patient presents for follow-up care, evaluation, or treatment of a malunited fracture of the shaft of an unspecified metacarpal bone. This applies when the initial fracture was displaced, and the current encounter addresses the complications or consequences of the improper healing. This code would be appropriate for patients undergoing assessment for corrective surgery or physical therapy for the malunion.

• Ensure documentation clearly states "malunion" and specifies the "shaft" of the metacarpal.
• Confirm the initial fracture was "displaced" and that this is a "subsequent encounter."
• If the specific metacarpal bone is known, a more precise code should be selected.