http://en.wikipedia.org/wiki/Health_insurance
The United States mixed economy health care system relies heavily on private (for profit) and not-for-profit health insurance, which is the primary source of coverage for most Americans. According to the United States Census Bureau, approximately 84% of Americans have health insurance; some 60% obtain it through an employer, while about 9% purchase it directly.[33] Various government agencies provide coverage to about 27% of Americans (there is some overlap in these figures).[34]
my 30 seconds of research.