Ask Dr. Z

I am hoping you can provide further guidance on the use of code 93655. I understand that 93655 can be used when there are two different arrhythmias (e.g., A-fib and A-flutter), and when arrhythmias are ablated in different anatomical locations (e.g., right and left atrium). But I am unsure what other scenarios 93655 might be appropriate for. Sometimes our EP lab charges for 93655, but I am dubious about its use, based on the documentation. Are arrhythmia "morphologies" the same as "mechanisms" (the term used in the CPT book)? Example: If a patient has three VT "morphologies", all located on an inferior wall scar of the LV, how is the ablation of these coded? What about an AT originating from a non-coronary aortic cusp that's ablated, followed by repeat mapping and ablation of "another early area more lateral"? Can you shed some light on the type of documentation I should be looking for to support 93655?