Only, this past week I got a call from the physical therapist's office saying they hadn't paid. So I called. Turns out the insurance had been having financial difficulties and has been bought out.
The only thing I can surmise from this is that they were fighting me either because of their difficulties or because they knew that they'd be out of business in a few months.
Anyway, the new insurance said to have the physical therapist file with them. I may have to fill out more forms with them, but at least hopefully it will all work out. Of course, they likely won't pay the massive late fees that have no accrued.