Here are the codes and guidelines:
93350 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 [this is a global service]
(Stress testing codes 93016-93018 should be reported, when appropriate, in conjunction with 93350 to capture the cardiovascular stress portion of the study)
(Do not report 93350 in conjunction with 93015)
93351 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 supervision by a physician or other qualified health care professional [this is a global service]
(Do not report 93351 in conjunction with 93015-93018, 93350. Do not report 93351-26 in conjunction with 93016, 93018, 93350-26)
93015 Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and/or pharmacological stress; with supervision, interpretation and report [this is a global service]
93016 Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and/or pharmacological stress; supervision only, without interpretation and report [professional component only] <-- no modifier should be applied
Code 93018 represents the professional component of the service only, so you should not append modifier 26, Professional component, or TC, Technical component. To report the technical component only, the rendering provider should report 93017.
93018 Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and/or pharmacological stress; interpretation and report only [professional component only] <-- no modifier should be applied
Code 93018 represents the professional component of the service only, so you should not append modifier 26, Professional component, or TC, Technical component. To report the technical component only, the rendering provider should report 93017.
93017 Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and/or pharmacological stress; tracing only, without interpretation and report [technical component only] <-- no modifier should be applied
Code 93017 represents the technical component of the service only, so you should not append modifier 26, Professional component, or TC, Technical component...
To report the professional component only, the rendering provider should report 93016, Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and or pharmacological stress, supervision only, without interpretation and report, or 93018, Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and or pharmacological stress, interpretation and report only...
To report both the technical and professional components, the single rendering provider should report 93015, Cardiovascular stress test using maximal or submaximal treadmill or bicycle exercise, continuous electrocardiographic monitoring, and or pharmacological stress, with supervision, interpretation and report.
In the original question, here's how it would be billed.
(when done in a facility) The physician should be reporting 93350-26, 93016 or 93018. The facility should be reporting 93350-TC and 93017.
If the provider owned the equipment (in the office), then you would bill 93351 (NO MOD).