Hi, ok this popped into my head and got me thinking;

 

If you are travelling out of Thailand, and the airline needs a PCR to travel (looking at Singapore Airlines & Etihad examples), you take it and you fail so go into 10/14 day quarantine.

 

What happens if after 10/14 days you are officially then become an overstay? do you end up with what I remember to be a red stamp? do you pay the fine? or has Thailand planned for this and they give you a confirmation letter at the hospital so give to immigration at BKK? I assume your nurses and doctors don't go to CW with your passport to plead for you ????

 

Maybe I'm overthinking it & worry too much... ????

If you had used the 30 day extension of your visa exempt entry you could apply for a extension (up to 90 days) for medical care at immigration. Most hospitals can assist with the getting the extension.