Modifier -59, XE in cardiology

We received a claims analysis letter from Amerigroup, stating that our provider fell outside of average utilization of the ff modifier. -59, XE

I queried our system and found the root cause.

Frequently our provider consults on cases, reads EKGs and echoes, stress test for the same patient, all same day service - so we bill as ff

99223-25
93010-59
93306-26-59
78452-26-XE

Are we overutilizing modifier -59?

What should be the correct way of using modifier -59?

Thanks!

* This article was originally published here