Upvote:2
Seems a bit like a moot question: if you have an actual emergency you most likely will have to go with whatever is available at the place you are. This being said, most local in hospitals in Thailand are quite good, even in the more rural areas.
Thailand is one of the most popular destination for medical tourism, so if you want to be extra safe you can research medical facilities that specifically cater to foreigners in the areas where you will be staying.
The tricky part may be the language barrier. English is spotty in Thailand: some of the younger people speak fluently, some of the older don't speak any at all. Having access to good translation tools (e.g. Google Translate) would certainly help.
Some emergency phone numbers
As of 2021 Thailand has nearly 100 "hotline" telephone numbers to call for assistance. They include 911 or 191 for emergencies,[5] fire, or unwanted intruding animals; 1699 or 1669 (or 1646 or 1554 in Bangkok) for medical emergencies; tourist police, 1155; car theft, 1192; a taxi refusing a trip, 1584; road accidents, 1146.[6]