Ask Dr. Z

I have something different to code that I have not come across before - a Methylergonovine injection into the RCA during a heart catheterization. Is this separately coded? And, if so, what would the code be? I have looked everywhere for this and the only thing that I found was that you should not report code 37202 or 93463 for injection of drugs into the coronary arteries. Note states: "Methergonovine challenge to the right coronary artery in view of the patient's persistent symptoms and unchanged anatomy decided to continue with a metahemoglobin challenge to the right coronary artery. Methergonovine was given in three-minute intervals, initially at 0.05 mg up to 0.15 mg with presence of angina, as well as diffuse coronary spasm of about 70% to 80% stenosis, especially distally in the posterior descending artery and posterior left ventricular branches."