If foreigners have a medical problems while in Thailand, they invariably seem to end up in one of a few hospitals that have a good reputation, and are well known to cater to foreign patients.
Bumrungrad Hospital (Sukhumvit soi 1) seems to be most popular among residents in the Sukhumvit area. However Bangkok General Hospital and its affiliates Samitivej Hospital (Sukhumvit Soi 49) and Bangkok Nursing Home Hospital (Convent Road, off Silom Road), are also very popular.
The last 4 or 5 years the above mentioned hospitals have been actively seeking medical tourists to visit Thailand. Amazingly up to 60% of patients at Bumrungrad Hospital and up to 40 % of patients at Samitivej Hospital are foreigners.
We do not think that Thai patients are not accepted in these hospitals. It just so happens that while foreigners may consider the hospitals cheaper than in their home countries, for most Thais they are simply to expensive to consider.