HCFA's Web site can be a valuable tool.
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D000368:Aged; D014487:Centers for Medicare and Medicaid Services, U.S. / Q000458:organization & administration*; D002648:Child; D002662:Child Health Services; D006801:Humans; D007255:Information Services; D020407:Internet; D008484:Medicaid; D006278:Medicare; D014481:United States