ICD-10 coding for nonunion

One of my Orthopedic physicians is seeing a new patient for a nonunion. The patient was seen initially outside the facility for fracture care but the physician did not treat the fracture appropriatley and the patient is now nonunion. How do I code the patient's care at my facility? My research is showing to code it as a fracture, initial care. If the physician takes the patient to the OR is it coded then subsequent, nonunion? Or is it still active care?

ICD-10 coding for nonunion