I need some help, I have a commercial in network HMO provider, charging a patient their copay for pre-op and post-op care (removal of stitches). As I know it, both are included in the 90 day global period. They were paid for the surgery and did not bill the insurance for the pre/post care just charged the copay. I know this is not allowed with CMS, is this the case with commercial coverage? I see it as double dipping, payment for pre/post was included in the primary surgical code which they were paid for. Am I on the wrong track, if not where can I find something in writing stating such?