Health insurance for an immigrant who's over 65?

My parents and I are thinking about bringing my grandmother to the U.S. but we are worried about health insurance. My grandmother is 87 years old and has many medical conditions so we need to get her something that would cover the medical expenses. She will be an immigrant because she doesn't have U.S. citizenship or green card, and she has never worked in this country. Since she is over 65 years old, she cannot get a health insurance, but I am hoping that she can get something that is similar to Medicare, Medi-Cal, or Medicaid. I know that Medicare is for people who is either a citizen or permanent resident and who has worked least 10 years in Medicare-covered employment. Is there anything that my grandmother could be eligible for medical health plan or insurance although she is an immigrant, over 65 years of age, and never worked in the U.S.? Any advice or suggestion would be much appreciated.

check out this site, http://www.immigrationhealth.com
I think you want a plan called the Inbound Immigrant. Check the fine print regarding pre-existing conditions, though. I am not sure they will cover that for 12 months, but I know they do not have any age limits and are pretty affordable.

there is insurance called medicover they cover people with assorts of medical problems that no other company would take on.

Medicade has lower requirements. You have to be extremely poor to receive it though. Most insurance policies do not cover anyone over 65 years. It'll be very hard for her to find anything.