Unsp fx unsp metacarpal bone, subs for fx w malunion

This code signifies a fracture of an unknown metacarpal bone in the hand that has healed improperly, resulting in a deformity or functional impairment. The patient is presenting for follow-up care or treatment related to this malunion, not the initial injury.

Apply this code when documentation indicates a patient is being seen for complications arising from a previously sustained, unspecified metacarpal fracture that has healed in an anatomically incorrect position. This is appropriate for subsequent encounters where the focus is on managing the malunion, such as for pain, limited range of motion, or surgical planning for corrective osteotomy.

• Ensure documentation clearly states "malunion" and specifies the encounter is subsequent to the initial fracture treatment.
• This code is for an unspecified metacarpal; if the specific metacarpal is known, a more precise code should be used.
• Do not use this code for nonunion (failure to heal) or delayed union (healing taking longer than expected).