What Are the Approved Health Insurance Providers for Non-Immigrant O-A Visa Holders in Thailand?

I believe that at this time if you leave and re-enter you will not need to prove insurance if your visa was issued before October 31. However, it is not 100% that you will get through easily through immigration. You may be questioned and you may have to point out the date of your visa and say that you don’t need insurance.

There is a downloadable form on the TGIA website (also search this group). If you can get Aetna US to sign the form then that would be the insurance certificate you could show to Immigration if you want a certificate.

However, for future 1 year extensions you will need Thai insurance. This would be a good time to consider switching to a non-immigrant O when this visa expires. That would relieve you of any insurance requirement in the future.

Okay, you ONLY need to use one of the 12 approved insurance providers IF you are getting a yearly extension of stay off an O-A visa.

If you're on a valid O-A you are fine. AND from now on when you buy a new O-A you can show proof of meeting the mandatory insurance requirements by using insurance from your country.

not only "recommended" but binding. Only these 12 insurances will be accepted. for the first year of a Non-Imm-O/A you can use a home based insurance, but after this 1-year period, only these 12 insurances listed will get approval

This is the list recommended by the Thai Embassy in the UK but I understand that it is only a recommendation and not binding. I tried them all but only one would do over 70's and then only until 75 (at very high cost)

here comes the list of accepted insurances:

If you entered with a multi entry Non-Imm-O/A Visa issued before October 31, 2019, you did not need to show a health insurance. And the 1-Billion question still is, does somebody with a Non-Imm-OA Visa from before the requirement came into effect, will need a thai helath insurance from one of those insurers from the tgia list, if he/she does a re-entry into Thailand with the stilll valid OA visa. I don't know for sure. But fact is, if your US insurance is not on the tgia list, or hasn't signed the foreign insurance form required for the application for a Non-Imm-OA at an embassy in your home country, it will not be accepted