I base my response on personal experience. My mom goes to physical therapy for her legs 3 times a week. At the conclusion of each visit, the therapist applies an unna boot to each leg. I apply these on the weekends.
When the EOB comes back for these visits, there is clear evidence of payment for the application and clear evidence of payment for the unna boot supplies.
I'm guessing that this may well be carrier specific but my mom has Medicare and they happily reimburse the entire shooting match.
Joyce