I am doing some research on Echocardiogram,DVT, and Venous Dopplers. I am looking at the codes 99303-93317,93320-93321 add on, 93662 and 93312-93314 and so forth, but I need some help. We are an hematology/oncology group and are thinking about performing these procedures in our office. I am not sure if these are the codes where I should begin to look. I am needing some advise from the experts who do this billing....and thank you for the Help!