I was in a car accident over 20 yrs ago, I had to have bilateral TMJ surgery. I wear an occlusal guard at night to help with headaches, shoulder pain and prevent any further complications or needing to have surgery every again. I am looking for the diagnosis, and codes to get my medical insurance to cover for a new one to be made. I am on my third one in 20 yrs. My surgeon doesn't have any of my medical records anymore since it has been 20 yrs since my surgery. This is medically necessary, not TMJ as a dentist would diagnosis it?