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

This code signifies a fracture of the neck of the fourth metacarpal bone in the right hand that is displaced, meaning the bone fragments are not properly aligned. The "subsequent encounter" indicates that the patient is receiving follow-up care for this fracture, and "nonunion" specifies that the bone has failed to heal completely after a typical healing period.

This code is appropriate for documenting ongoing treatment of a right fourth metacarpal neck fracture where imaging or clinical assessment confirms displacement and a lack of bony healing. This would include scenarios such as a patient presenting for re-evaluation of a previously treated fracture that has not united, or for planning further interventions like bone grafting or revision surgery due to nonunion.

• Always confirm laterality (right hand) and the specific bone (fourth metacarpal neck).
• The "K" seventh character is crucial for indicating a subsequent encounter with nonunion.
• Ensure documentation clearly supports both displacement and the diagnosis of nonunion.