Can a visitor from the US in Thailand apply for a medical extension of their visa?

Yes, there is a process for obtaining a medical extension for visitors in Thailand, but it requires documentation from your doctor. Medical extensions are typically granted for short durations to accommodate necessary medical procedures or recovery times. It's essential to coordinate with your doctor, who will need to provide supporting paperwork. After any surgery, you'll also need a 'fit to fly' sign-off from your doctor if you plan to leave Thailand.