What are the best options for long-term medical insurance in Thailand as a tourist on a DTV?

I would recommend just going with the reputable companies like Safetywings. That way, you'll know it will be good in case of emergencies. I've never had issues with them and had to do 2 claims so far.

If you intend to stay in Thailand for a prolonged period of time (over 1 year) buy from a Thai insurer, if you buy a policy from your home country your chances of a successful claim will be significantly lower. AIA is the best one but they won’t touch tourists (including DTV holders), next best is AXA. You can apply and buy online with no need to go through an agent, don’t listen to anyone who says you need an agent to help you make a claim etc etc, apart from make a commission from you they can’t do anything else. AXA has the best customer service staff than any other Thai company, possibly even better than AIA, so no need to involve a middle man. Also no need to say cheers or thanks, you are welcome 🙏😁

I've used Safetywing for a year and a half.

My ex worked at an insurance agent here in Thailand and I heard a lot of horror stories about Thai insurance companies refusing to help their clients or fight them on every baht they made claims for.

Safetywing has been a breeze. I've made 5 claims so far, and every time they have just accepted the claims and made the payouts, no questions asked.

They have two packages that cover you worldwide:

Pacific Cross does offer health insurance plans for residents of Thailand regardless of their visa type.

Contact this office

Travel insurance generally only covers for a maximum stay of 30 days in one country but can be extended to 60 days but very expensive imo Depends how long you want cover for, always check the small print t&c’s

Genki Traveler (month to month... By Allianz)

What about using one from your own home country?

Yes you can do a medical insurance with a tourist visa.

Try AXA (they have one option that is possible for tourist visa and one not) or Alianz-Ayudaya

better you email several direct, they certainly don't offer long term TRAVEL insurance, but health cover I am sure they will, I certainly never been asked for visa, but will need a fixed address