Multiple Answer Question: Mechanical ventilation used during surgery is coded when: A. The postoperative mechanical ventilation continues for more than two days. B. The patient requires mechanical ventilation for an extended period of time postoperatively C. The physician has clearly documented an unexpected extended period of mechanical ventilation D. The patient has a specific problem and is maintained on the mechanical ventilation longer than expected E. None are correct, you never assigned mechanical ventilator after surgery F. You always assign mechanical ventilator during surgery