Bumrungrad update. Just a reminder that you can extend tourist stay and do 90 day reports at bumrungrad hospital. Downside is you have to show up on a Saturday morning. It costs a bit extra as well. But man! What an absolute pleasure not having to go to chaengwattana. Plus it's a pretty good excuse to have a forenoon beer.
Thanks for the tip, Tod!
TLDR : Answer Summary
You can extend your tourist stay and do 90-day reports at Bumrungrad Hospital. While you need to physically show up on a Saturday morning and it incurs an extra fee (900 THB), many users find the service convenient compared to the traditional processes like those at Chaengwattana. Also, the service is not limited to patients and relatives; anyone can utilize it, and arrangements can sometimes be made via email without prior in-person attendance.