What are the health insurance requirements for a Non-O-A retirement visa in Thailand?

This post discusses the requirements related to health insurance for the Non-O-A retirement visa in Thailand, particularly focusing on the necessity of a health insurance certificate from approved Thai insurers. Users share experiences regarding foreign insurance policies, the importance of using a TGIA-accredited provider, and the need for proper documentation, especially when renewing the visa. It highlights that policy coverage by foreign insurers like Medicare is not accepted outside the U.S. and explains the distinction between Non-O and Non-O-A visas.