Unless you have a good medical insurance, donтАЩt bother with private hospitals deal with University Teaching Hospitals, you will pay through the nose other wise; they will run your bill up alarmingly, the bill will be bad for your heart.
I started my treatment at the Bumrungrad in Bangkok, until my Insurance ran out then the Professor treating me said, I Teach at Chula, you can get it for 1/4 of the price, IтАЩm so glad I did as they had much better equipment and all the very latest you could wish for, bought by the King and the Crown Prince.
I have just had life saving treatment at both the below and so glad I did, the only down side is, it may take longer to book in, to start with and you may have longer to wait to see your doctor, but itтАЩs the kings professors you see.
Siriraj Hospital
http://www.si.mahidol.ac.th/eng/siriraj/Centers.asp
Or
http://www.chulalongkornhospital.go.th/
Out side not look so good, but treatment par to excellence/