from the Thai Embassy re my query.
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Regarding to your query, when you are applying for Non Immigrant “O” (retirement) visa through Royal Thai Embassy, you need to submit “Health insurance policy with minimum coverage of 40,000 THB/year for outpatients and 400,000 THB/year for inpatients, and covering the entire duration of the applicant's stay in Thailand to further processing your Visa application.
Once your visa is being approved by the Royal Thai Embassy, you can apply for COE (Certificate of Entry) online and you need to submit Health Insurance certificate” with coverage of at least 100,000 USD including treatment for COVID-19 to further processing your COE application.
For further assistance you may contact the health insurancs directly.