If anyone has not actually seen a stress echo performed, I highly recommend it. It makes coding much clearer.
A stress echo is basically an echo at rest and then the patient is put on the treadmill and put on a table to echo the heart during excercise. CPT included the rest portion in CPT 93351. See description (bolding is mine)
ECHOCARDIOGRAPHY, TRANSTHORACIC, REAL-TIME WITH IMAGE DOCUMENTATION (2D), INCLUDES M-MODE RECORDING, WHEN PERFORMED, DURING REST AND CARDIOVASCULAR STRESS TEST USING TREADMILL, BICYCLE EXERCISE AND/OR PHARMACOLOGICALLY INDUCED STRESS, WITH INTERPRETATION AND REPORT; INCLUDING PERFORMANCE OF CONTINUOUS ELECTROCARDIOGRAPHIC MONITORING, WITH PHYSICIAN SUPERVISION
Rarely should you need to use both 93306 and 93351. Just my two cents.