Severely displ Zone III fx sacrum, subs for fx w nonunion

This code signifies a severely displaced fracture located in Zone III of the sacrum, which involves the sacral alae and sacroiliac joints. The fracture has failed to heal properly, resulting in a nonunion, and the patient is presenting for follow-up care or treatment related to this unhealed fracture.

This code is appropriate when a patient with a previously diagnosed and treated severely displaced Zone III sacral fracture returns for ongoing management of a confirmed nonunion. This includes visits for evaluation of nonunion, planning for revision surgery, or conservative management of the unhealed fracture.

• Ensure documentation clearly specifies "nonunion" and the "subsequent encounter" for the fracture.
• Verify the fracture location is explicitly documented as Zone III of the sacrum.
• Confirm the displacement is noted as "severe" in the clinical record.