Can I use foreign health insurance for the OA retirement visa in Thailand?

The question revolves around whether one can use a foreign insurer not on the TGIA-approved list for the health insurance requirement for the OA retirement visa, provided the coverage meets specific criteria and the insurer signs the TGIA Foreign Insurance Certificate. Based on responses, it appears this is possible initially; however, issues may arise when extending the visa, as only approved Thai companies are accepted for that process. Clarifications about the terminology for different visa types indicate that the Non-O/A is sometimes confused with the actual retirement visa.