I have regular checks for bladder cancer with Dr. Wittawat Rawiyotai at Bangkok Hospital in Chiang Mai. Speaks good English, answers all my questions. Does cystoscopies under local anesthesia, 18,000 baht.
The last cystocopy I had was in November. He found an inflamed nodule which he biopsied, about 5000 baht extra. No issues with the biopsy.
Apologies if that information is too late to be useful, I've only just seen the thread.