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"During mapping, the pulmonary veins were noted to be silent from prior ablation. The pulmonary veins were isolated to the level of antrum using RE. A roof line and an infero-posterior line were created with radiofrequency ablation for the purpose of isolating the posterior wall of lt atrium. Electrograms were mapped to the Septum and floor of lt atrium, lt atrial lateral wall and anterior roof of the left atrium. RF was applied with elimination of these potentials. Left atrial appendage was ablated and coronary sinus was ablated/isolated. Isuprel was infused up to 20mcg/min. Following infusion, there was no evidence of reconnection between lt atrium and pulmonary veins. No arrhythmias were induced. Superior vena cava was silent. Conclusion: Successful ablation of lt atrium septum, coronary sinus, and lt atrial appendage." Should 93656, 93655, and 93657 be coded or only 93656 for ablation procedures?