Quick question. Can insurance deny me to close my claim if A: I haven't received any hospital bills and B: if I got…

Quick question. Can insurance deny me to close my claim if A: I haven't received any hospital bills and B: if I got cleared to work, never went through physical therapy like I was supposed to. I was in a bad accident last October and closed my son's claim. Mine is still open due to me having to go to therapy, but when we moved out here my PCM cleared me and said I didn't have to do it. And I don't see a point it keeping it open, there is nothing else to claim and my insurance still hasn't billed me. They told me to send any bills I got after the accident but haven't gotten any. Could they deny me to close it???