Ben,
I am like you. I also have an HMO, and was treated at a Cancer center, but in a smaller town. My original diagnosis came after one dentist saying it was something, and two opinions saying it was nothing, and then one finally did a biopsy to find it was something. After that I never sought another opinion. I stayed with my ENT that did the biopsy. He referred me to the cancer center at the hospital and that who is I went with. I am not looking at being two years out of treatment.