Type O medical treatment visa
Visa neededPeople receiving medical treatment in Thailand.

Thailand visas
People receiving medical treatment in Thailand.
People coming to receive medical treatment can use Type O.
People coming to receive medical treatment can use Type O.
Yes. Rules depend on the country that issued your passport. Open the Thailand visa page and choose your passport for a plain answer.
Yes. Officials can refuse a visa or entry, even after you apply. Give true answers, bring the documents asked for, and keep proof of your onward trip and money.
On Thailand's official immigration or foreign ministry website, or at its embassy. Rules change, so check close to your trip.
Often you cannot switch visa type inside the country. Ask the immigration office before you travel if you might need to.
Reviewed by @snuck