ASC Surgical Assistant

I am new to ASC billing and I think I know the answer to this question, but I am going to ask anyway. We have a physician owned ASC and we perform Stim Implants in the ASC (CPT 63685 and CPT 63650 x 2). We also use a PA as an assistant. We are billing out CPT 63685-AS on the pro fee side and wonder if we can/should be billing it out on the ASC Facility side.

Any direction would be much appreciated.

Thanks

ASC Surgical Assistant