International Travel Medical Insurance

My parents are coming here in the United States from the Philippines as tourists. Both are in their 70s. They were in and outside the United States and this could be their last visit because they are old and in health risks. I could not say no to them to come here because of their health problems. I love my parents. Lately, my father was admitted to hospital in the Philippines and has been treated. It is OK now, but I am very concerned about his long trip and stay in the United States without insurance. Whatever happens to them, I can pay thousands of dollars for their medical bills that I can not afford.
Someone here has suffered Order international medical insurance for their parents? Are they right? Could you give me the site?

healthplans.my-age.net - here's my plan for health insurance. If I remember they can provide such a service.

Get as many resources as you can may be an option, but it could be quite time here ... http://www.healthinsurance-onlinetips.in is a resource that I had a good experience.