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The term health insurance is
generally used to describe a form of insurance that pays for medical expenses.
It is sometimes used more broadly to include insurance covering disability or
long-term nursing or custodial care needs. It may be provided through a
government-sponsored social insurance program, or from private insurance
companies. It may be purchased on a group basis (e.g., by a firm to cover its
employees) or purchased by individual consumers. In each case, the covered
groups or individuals pay premiums or taxes to help protect themselves from high
or unexpected healthcare expenses. Similar benefits paying for medical expenses
may also be provided through social welfare programs funded by the government.
By estimating the overall risk of healthcare expenses, a routine finance
structure (such as a monthly premium or annual tax) can be developed, ensuring
that money is available to pay for the healthcare benefits specified in the
insurance agreement. The benefit is administered by a central organization, most
often either a government agency or a private or not-for-profit entity operating
a health plan.

Historically, HMOs tended to use the term "health plan", while commercial
insurance companies used the term "health insurance". A health plan can also
refer to a subscription-based medical care arrangement offered through HMOs,
preferred provider organizations, or point of service plans. These plans are
similar to pre-paid dental, pre-paid legal, and pre-paid vision plans. Pre-paid
health plans typically pay for a fixed number of services (for instance, $300 in
preventive care, a certain number of days of hospice care or care in a skilled
nursing facility, a fixed number of home health visits, a fixed number of spinal
manipulation charges, etc.) The services offered are usually at the discretion
of a utilization review nurse who is often contracted through the managed care
entity providing the subscription health plan. This determination may be made
either prior to or after hospital admission (concurrent utilization review).
The US market-based health care system relies heavily on private 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. Various government agencies provide
coverage to about 27% of Americans (there is some overlap in these figures).
Public programs provide the primary source of coverage for most seniors and for
low-income children and families who meet certain eligibility requirements. The
primary public programs are Medicare, a federal social insurance program for
seniors and certain disabled individuals, Medicaid, funded jointly by the
federal government and states but administered at the state level, which covers
certain very low income children and their families, and SCHIP, also a
federal-state partnership that serves certain children and families who do not
qualify for Medicaid but who cannot afford private coverage. Other public
programs include military health benefits provided through TRICARE and the
Veterans Health Administration and benefits provided through the Indian Health
Service. Some states have additional programs for low-income individuals.
In 2006, there were 47 million people in the United States (16% of the
population) who were without health insurance for at least part of that year.
About 37% of the uninsured live in households with an income over $50,000.

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