以下是引用hebbe123在7/18/2013 5:38:00 PM的发言：
搜了一下medicare qualification。有兴趣的MM一块儿看看。

http://www.cms.gov/Medicare/Eligibility-and-Enrollment/OrigMedicarePartABEligEnrol/index.html?redirect=/origmedicarepartabeligenrol/01_overview.asp

Medicare Part A ....A second group of aged individuals who are eligible for Part A are those persons age 65 or over who are not insured but elect to purchase Part A coverage by filing an application at a social security office. Because a monthly premium is required, this is called "Premium-Part A". ....persons desiring Premium-Part A can only file for coverage during a prescribed enrollment period (see the discussion under Medicare Part B) and must also enroll or already be enrolled in Part B.

Medicare Part B ....A person age 65 or over who is not entitled to premium-free Part A must meet the following requirements to be entitled to Part B: he or she must be a U.S. resident and either a citizen, or an alien who has been lawfully admitted for permanent residence with 5 years continuous residence in this country at the time of filing. ....

从节选的这两段看，是不是持绿卡5年以上的老人，即使没有在美国工作缴税过，也可以自费买Medicare Part A,但前提条件是，必须也买Medicare Part B 。 如果不考虑非得享受免费的MEDICARE，而且象前面MM说的那样Medicare Part A+Medicare Part B 只要600多美金的话，那老人用国内的退休金还是可以支撑这里的保险premium的？