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

This code signifies a previously sustained, non-specific fracture of the first metacarpal (thumb) bone in the left hand that has healed improperly, resulting in a malunion. The patient is currently receiving follow-up care for this complication.

Apply this code when documenting ongoing treatment for a left first metacarpal fracture that has healed in an anatomically incorrect position. This would include scenarios such as physical therapy for functional deficits due to the malunion, or evaluation for potential corrective surgery.

• Ensure documentation clearly specifies "left hand" and "first metacarpal" to support this code.
• Verify the encounter is for follow-up care of the malunion, not the initial injury or routine healing.
• Look for terms like "malunion," "healed with deformity," or "improperly united fracture" in the medical record.