How do you code this.

This sounds like a myocardial perfusion study using the cardiolite for imaging and adenosine to pharmacologically induce stress. You will need to know if it was a single or multiple study and if it was done with wall motion and ejection fraction. Assuming the billing physician owns the equipment and bills globally, coding options are:

78464 or 78465 [single/multiple study]
93015 [stress test]
+78478 [wall motion]
+78480 [ejection fraction]
A9500 [cardiolite - carrier priced; paid per study dose up to 40 mCi. To determine units to bill divide total mCi used by 40 and round up].
J0152 [adenosine, ASP priced per 30 mg]