Due to the current COVID-19 outbreak, every non-Thai national must present a health certificate named “Fit to Fly” before entering Thailand. As its name suggested, a Fit-to-Fly certificate is a medical document certifying that you are free of symptoms and fit to fly.
You can get it from a hospital by informing them that you want to get the “Fit-to-Fly” certificate. The certificate must be issued by a doctor no more than 72 hours before departure. For example, if your flight is on 14 January 2020, your Fit-to-Fly certificate must be issued on 11, 12 or 13 January 2020. The certificate is required upon check-in with the airline and on your arrival in Thailand later. Do note that failure to present it may result in being denied boarding.
Example of Fit-to-Fly Certificate