Question: Is it correct to use 93307 for normal echocardiograms and 93321 for transthoracic echocardiograms (TTE)? Maryland subscriber Answer: Code 93307 (Echocardiography, transthoracic, real-time with image documentation [2-D] with or without M-mode recording; complete) represents a complete transthoracic echocardiogram study and includes four chamber views, assessment of valvular size, shape, measurement of the aortic root, etc. Due to the additional diagnostic information, this study is more comprehensive than +93321 (Doppler echocardiography, pulsed wave and/or continuous wave with spectral display [list separately in addition to codes for echocardiographic imaging]; follow-up or limited study), during which the physician may look at two chambers and nothing else. -- You Be the Coder and Reader Questions were prepared with the assistance of Jim Collins, ACS-CA, CHCC, CPC, president of Compliant MD Inc. and compliance manager for several cardiology groups around the country; and reviewed by Jerome Williams Jr., MD, FACC, a cardiologist with Mid Carolina Cardiology in Charlotte, N.C.