I work for an Internal Medicine doctor. A lab comes into our office and performs the service of the Duplex scan of extracranial arteries. They also interpret and write the results. They do not send any claims to the insurances nor do they bill patients. My doctor wants to charge an 93880 or 993882 for these services, then he turns around an pays the lab who performs these services. I'm not quite sure if this is OK to do. If it is legal then what code would be appropriate? Can someone please help me figure this out? Much appreciated.