HCPCS Code A9502: Technetium Tc-99m Tetrofosmin, Diagnostic, Per Study Dose

Two units—one for each phase, i.e., one for the rest study and one for the stress study—as the code is per study dose.

Yes. The radiopharmaceutical code must appear on the same claim as the imaging procedure code, with matching service dates for correct processing.

Yes. It's possible for the patient to be allergic to it. There will be pain and discomfort in the injection site. It's also possible for the patient to have arrhythmias or a heart attack, so you must monitor your patient and manage these ASAP if they occur.