No...I got my O A last year when I lived in Manila. This is my first time going for an extension

@Bob *********

I got my first one last year...this is my first extension

@Dave *******

absolutely correct....an oversight on my part, now that I know I'll follow the rules...no intent of dodging it intentionally

@Chris *****

now that I know, I will

My O-A says multiple...maybe there are variants

Thank you all! Very helpful. Yes, it is an O-A visa, and I want to have health insurance anyway, but now I know I must have it. I now know where to go to extend. Is it just me, or does it seem like paying a 2k baht fine is easier than going all the way to immigration to check in? As I understand it, you have to check in physically the first time and after that it can be done online.