Insurance mandatory for long-stay foreigners By The Nation   File photo   HEALTH insurance has been made mandatory for foreigners aged 50 years and above seeking long-term stay in Thailand.   The insurance policy must offer up to Bt40,000 coverage for outpatient treatment and up to Bt400,000 for inpatient treatment.    This is one of the measures the government has introduced to ease the financial burden placed on state hospitals by foreigners,