Nondisp fx of neck of unsp MC bone, subs for fx w nonunion

This code signifies a fracture of the neck of an unknown metacarpal bone that was initially nondisplaced but has failed to heal properly. The patient is currently receiving care for this ongoing healing complication.

Apply this code when a patient presents for follow-up treatment of a previously diagnosed nondisplaced metacarpal neck fracture that has developed nonunion. This indicates the bone fragments have not united after a sufficient healing period. This code is appropriate for subsequent encounters where the nonunion is the focus of treatment.

• Ensure documentation clearly specifies "nonunion" and that the fracture was initially nondisplaced.
• Verify that the encounter is for ongoing management of the nonunion, not the initial injury or routine follow-up of a healing fracture.
• Do not use this code for malunion; a separate code exists for that complication.