@Becky ****************
you physically need to meet with the Thai doctor so you can be evaluated, and the surgery, and recovery plan can be mapped out. If you don't follow this you can be issued a medical 30 day visa, that can be extended with the doctor's note that you are unfit to fly. A surgery, which lots of people come to Thailand for, is not considered needing long term recurring treatment. This is the reality of using just an initial appointment now. If you had a heart condition, or were a diabetic, that would be different, as those require long term recurring treatments. This is how the medical category works.