From what I understand is the only exception for mandatory health insurance for extension of stay, when y'r original visa (mostly the visa sticker in y'r passport) is/was a non imm O-A visum.
Okay, thanks for answers. I think 30 days indeed. Well I try to make my 90 day notification in sync with my year extension but no real problem, only live 15km from the office. I'll ask over there next month.
A bit curious too. Think the dates he mentions, are the dates on the visa sticker. The dates of the stamp should be around 18-07-2020 to 17-10-2020 I guess indeed.
Ah, well that can be a nice alternative for some of us who are over 75 (almost not possible for a Thai insurance), yearly extended based on retirement and came on Non imm. O-A, long time ago. Thanks for explanation š