My experience has not been all that good here. Some things are cheap, but I had a lot of problems with prices going up once they had me in their clutches, so to speak. For a routine colonoscopy the hospital I dealt with required I stay 2 nights. My bill was about $2000 US!
Later the pharmacy charged me 800 baht @ (about 24$) for suppositories that I was able to buy at a regular Thai pharmacy for 80 baht @. That's some major gouging.
It is much cheaper to do as an out patient in the US. If you have insurance, it might be a different story. The nurses are nice, but I find most of the doctors as arrogant as their US counterparts, with less knowledge. I might have to have my colon removed. If I do I will hope to choose another country. Not because of expense, but because I don't see any pride of workmanship in people and their professions in Thailand. Get the job done quick, get the money, and go play. I'm biased. Loved the place for 2 years, but learned too much. If you are unfamiliar with Thailand, really spend some serious time here learning about the place before you pull up your roots. The honeymoon is over with me. My advice is look elsewhere.