If you put aside the same yearly amount you would pay to an insurance company you will not be covered enough if something serious will happen. I am 65 yo and have a 5,000,000 THB coverage insurance with PACIFIC CROSS. The premium is around 52,000 THB per year with no coverage below 50,000 THB of hospital bill. You get a 10% on the yearly premium if you did not use the insurance the previous year.