Thailand

Long known for sex-change procedures, Thailand offers some of the world's best values for a variety of health care. Major procedures can be 50 to 70 percent cheaper there than in the U.S., according to Patients Beyond Borders. The country had as many as 1.2 million medical tourists last year, making it the top destination.

http://www.bloomberg.com/slideshow/2013-06-25/top-travel-destinations-for-medical-tourism.html#slide9