Since October 2021 the Thai O-A visa has required health insurance with a minimum insured sum of 3,000,000 baht, roughly 100,000 US dollars, covering general illness including COVID-19. That single figure replaced the earlier rule of 400,000 baht inpatient and 40,000 baht outpatient. A foreign insurer is still accepted, on one condition most applicants discover too late: your insurer must complete, sign and stamp the official Foreign Insurance Certificate.
The exact figure, and when it changed
Cover must reach 3,000,000 baht or 100,000 USD as an insured sum, for general illness including COVID-19 treatment, for the whole period of stay. It applies to the first application and to every extension. The rule took effect on 1 October 2021 and replaced the previous split thresholds.
The certificate that stops most applications
A foreign insurer is accepted, but an ordinary letter on company paper is not. The consulate wants a specific form, downloadable from the Thai insurers' association portal, completed, signed and stamped by your insurer. Many European and American insurers have never seen it and take weeks to produce it. Ask for it before you buy the policy, not after.
O-A or O-X: the longer visa asks for less cover
This is counter-intuitive and it catches people out. The O-X visa, valid up to ten years for applicants over 50, requires only 400,000 baht inpatient and 40,000 baht outpatient per policy year. In exchange it demands a policy from an approved Thai insurer, held without interruption for the whole period. A lapse in cover means the visa is withdrawn.
The renewal trap
The first application is made at a consulate abroad, where a foreign insurer is accepted. The annual extension is filed with Thai immigration, and most offices want a policy from a locally approved insurer. The contract that got you the visa may not be enough twelve months later. Practice differs between offices, so check with yours well before the deadline.
What the certificate must show
Four details are checked every time. The insured's name spelled exactly as in the passport. The validity period, which must cover the whole requested stay rather than a calendar year. The insured sum, written as a figure in baht or dollars rather than described as worldwide cover. And an explicit mention of COVID-19, still requested by many posts. A policy that is perfectly adequate on substance gets refused when one of those four lines is missing.
How long to allow before filing
Allow six to eight weeks between first contacting your insurer and holding a complete file, if the insurer has never seen the form. Two to three weeks if they have. The constraint is rarely the policy itself, which can be issued in days, but the internal signature and stamping route inside the insurer, which often goes through a legal department. That delay, not the underwriting, is what derails applications.
Where to start, in order
Ask your current insurer whether they know the Foreign Insurance Certificate and how long they take to issue it, before discussing price. Then check the insured sum in the policy wording rather than the brochure. Finally, confirm with the immigration office you will report to what they will require at extension, because that answer, not the consulate's, decides which contract works long term.
Frequently asked
Does travel insurance count?
No. The requirement is for health insurance covering general illness for the duration of stay, not a trip-length travel policy.
Can I buy the policy after arriving in Thailand?
With several locally present insurers, yes. Many international contracts require you to be resident in your home country at the time of purchase.
Is the 3 million baht figure annual or for the whole stay?
It is an insured sum, not an annual care budget. The policy must show that limit and remain active for the entire visa period requested.
What if the consulate rejects my certificate?
The file is held rather than permanently refused. You can submit a corrected certificate, but allow for your insurer's production time, often several weeks.
Do I need a Thai-approved insurer from the start?
Not for the initial O-A filed at a consulate, where a certified foreign insurer is accepted. In practice yes for the annual extension filed inside Thailand, at most immigration offices.