13. a physician performs a four vessel autogenous (one venous, three atrial) coronary bypass on a patient who had a previous cabg two years ago. a few days after the procedure, the patient started having problems breathing and was placed on a ventilator. x-rays revealed that a hepatic adenoma has invaded the diaphragm. name two sections of the cpt code book you will find codes for this scenario. explain how you determined each of those sections would be referenced. describe how you will determine when multiple cpt codes are needed to explain all services provided to the patient during an encounter.