What can I expect when seeking a medical extension for a visa in Thailand after a hand injury?

A user is approaching the end of their 30-day extension on a 60-day METV due to a hand injury that required surgery and a doctor's advice against traveling for at least a week. They inquire about what to expect at the immigration office in Samui. Responses suggest that a doctor's medical certificate stating the travel restriction may allow for an extension of stay on medical grounds, typically for up to 90 days at a cost of 1,900 THB. However, concerns were raised regarding the difference between being advised not to travel and being unable to travel, and some participants noted that all extensions, including potential medical ones, are subject to the same fees.