Disp fx of nk of 4th MC bone, l hand, subs for fx w nonunion

This code signifies a break in the neck of the fourth metacarpal bone in the left hand that has shifted out of alignment and has failed to heal properly. It indicates that the patient is receiving ongoing care for this specific fracture nonunion.

Apply this code when documenting follow-up visits for a patient with a previously diagnosed displaced fracture of the left fourth metacarpal neck, where the fracture has not united and requires further management. This includes encounters for continued treatment, evaluation of nonunion, or planning for surgical intervention due to the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the "left" hand and "fourth" metacarpal.
• Verify the fracture is explicitly described as "displaced" in the medical record.
• This code is for subsequent encounters; an initial encounter would use a different seventh character.