Long topic really, but depends how comprehensive you feel you need it to be....will there be 'exclusions'.
I made this up in January when looking at 'comprehensive' plans......all in Thai baht.
Company-Product Max Claim p.a Max on room/ICU Premium Overseas Cover
BUPA-Platinum 2m 2 million 10k/16k per day 57,175 Worldwide exc USA
AXA Smartcare Optimum- Classic 2.5 million 10k/As charged 51320 Medical required 1.5 million
ACS ASIA 1c 15 million 7.5K 49740 100% 7 weeks max
April 30 million 100% 70200 100%
Then there are much cheaper plans which give limited cover broken down into categories... and example being the plan offered at The Expats Club. There are 3 plans and 4 age groups, varying from 18,000 baht to 37220 for your age excluding out-patient options.
The exclusions is important, the companies are quick to lump a lot of them in there for any issue...... if you have high BP or Hypertension,so much gets excluded, the premium stays up there and you wonder what you are covered for!
I found communicating with BUPA to be okay and you could always send an email to an insurance brokers. eg AA.