Unsp fx third MC bone, left hand, subs for fx w malunion

This code signifies an unspecified fracture of the third metacarpal bone in the left hand that has previously been treated but has healed in an anatomically incorrect or misaligned position. The malunion indicates a complication of the initial healing process, potentially leading to functional impairment or cosmetic deformity.

Use this code when documenting a patient presenting for follow-up care, evaluation, or treatment of a left third metacarpal fracture that has healed with malunion. This applies to situations where the initial fracture type was not specified, and the current encounter addresses the consequences or management of the malunion.

• Ensure documentation clearly states "malunion" and specifies the left third metacarpal.
• This code is for subsequent encounters; an initial encounter for the fracture would use a different seventh character.
• If the specific type of fracture (e.g., transverse, oblique) is known, a more specific code should be used.