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

This code signifies a displaced fracture of the neck of the fourth metacarpal bone in the left hand that is currently healing with an unsatisfactory alignment (malunion). This indicates a previous injury that did not heal correctly, resulting in a deformity or functional impairment.

Use this code when a patient presents for follow-up care of a left fourth metacarpal neck fracture that has healed in a misaligned position. This would typically be documented by imaging studies confirming malunion and clinical assessment of the patient's hand function. It is appropriate for subsequent encounters after the initial treatment of the fracture.

• Ensure documentation clearly specifies "displaced" and "malunion" for the left fourth metacarpal neck.
• Verify the encounter is for follow-up care of the fracture, not the initial treatment.
• Differentiate from nonunion, which implies a complete failure of bone healing.