@Wittichai ***********
Sure. He went to Phaya Thai 2 hospital for his paperwork to treat high blood pressure. He explained to the doctor up front that he used to live in Singapore but has since moved to Bangkok and will be applying for the DTV. His doctor said no problem but would first require him to get labs done. Wait for results, come back for consultation then he'd provide the paperwork for the DTV. The letter that the doctor wrote was very simple. It had my husband's condition, treatment plan with intended appointments for the future.
When he submitted everything in Hanoi, they later asked for the doctor's medical ID and license #. We had to contact the doctor for this from Hanoi, losing more time so I mention this to save time for anyone intending to go the medical soft power route.