The number of the message on TV.com will be in the upper right corner of the post:
Report post #1312
Posted 15 hours ago
a friend just tried to do an OA extension at jomtien and was rejected for having no insurance. He's been doing extensions for years.
It appears on page 88 of that thread -- if you copy the URL when you are on the specific page, posting it here will link to the particular page:
https://forum.thaivisa.com/topic/113256 ... /#comments This page starts with post #1306, scroll down for #1312.
I don't doubt the "friend's report" because as I have previously posted the sign at Desk 8 at Jomtien Immigration Office and the comment from a person that inquired and was told after they examined his passport stamps (he is on an extension of stay whose base Visa was an O-A) that he would need to have health insurance when he went in to renew his annual extension of stay, but IMO firsthand reports can be more persuasive.
As GB suggests, if your underlying Visa is an O-A (or you don't know which), go to your local Immigration Office and inquire if you will need to have health insurance - if not before, at least 30 days before your permission to stay expires so you have time to sort out its impact on your particular situation.