You should probably call your insurance company and find out what gives.

This would REALLY bother me because a practioner of any sort that is that apparently disorganized about their billing indicates other professional issues to me. Insurance issues are difficult enough at times without a doctor/therapist that doesn’t stay on top of it. Inability to handle basic insurance issues is a big red flag to me for any medical billing. If you require insurance to pay for your therapy, you need a therapist who has that end of things under control.