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How would you bill the following procedure, 93603, 93612 or can you use additional add-on codes? "An EP catheter was advanced to the RV apex via the SRO a DecaNav catheter was advanced to the right ventricle. The Catheter was withdrawn to the AV groove and placed out the CS. A 3D activation and EP map of the CS wa created using the cardio system. The maximal extent that the CS could be instrumented was to about the 1 o'clock position at which point the local ventricular signal in the CS was largely eqiuvalent to the QRS onset of hte PVC and pace mapping was 85%. Despite extensive efforts, the catheter could not be advanced further. In an effort to get to an earlier point for ablation, the DecaNav catheter was exchanged for an ablation catheter and further mapping points were taken in the area of interest. Despite the bidirectionally of the catheter, the ablation catheter could not be successfully advanced to the primary area of focus. As a result, further attempts at reaching the epicardial PVC focus were abandoned and the procedure was terminated."