Ive had biopsies done by both an ENT and an oral surgeon. For insurance purposes a biopsy and OC are medical not dental. Call your insurance company and find out what your best option would be. Just make sure you find an ENT that specializes in OC patients and not the type that primarily puts tubes in kids ears. If you are going to an oral surgeon, same thing. You want one who treats OC patients and not just TMJ or removing wisdom teeth. And yes, ENTs can get backed up with appointments. Since you are already an established patient and because of the nature of your office visit you shouldnt have to wait too long for an appointment with your ENT.
My concern or seeing a dentist is what I stated in my previous post. In my opinion, seeing a dentist seems like an extra step in getting the sore checked by the right person. Many dentists have not even encountered OC in their day to day exams and fillings, they focus on the teeth and tend to ignore the surrounding tissue in the patients mouth. Putting it another way... I wouldnt want a small engine mechanic who fixes my lawn mower changing the brakes on my car. They simply arent qualified for the job. Most dentists also do not preform biopsies but a very small percentage will do them.
Main OCF site --- Diagnosis/Discovery Hope this helps!