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Can you bill code 93657 if performed prior to the PVI?

"The mitral isthmus was targeted for ablation between the mitral valve and the left pulmonary veins targeting an ablation index of 500 with an inter-lesion distance targeted as 4-6 mm. Mitral isthmus block was achieved. Pulmonary vein antral isolation was performed targeting an ablation index of 500 anterior and superior and ablation index of 400 posterior and inferior. Inter-lesion distance was targeted as 4-6 mm. Radiofrequency energy was delivered to a single loop encompassing the left pulmonary veins, right pulmonary veins, and posterior wall. Using the mapping catheter, additional radiofrequency lesions were delivered as needed to complete electrical isolation of the posterior wall and pulmonary veins."