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In the United States, health insurance is any program that helps pay for medical expenses, whether through privately purchased insurance, social insurance or a social welfare program funded by the government.〔See, for example, US Census Bureau,("CPS Health Insurance Definitions" )〕 Synonyms for this usage include "health coverage," "health care coverage" and "health benefits." In a more technical sense, the term is used to describe any form of insurance that provides protection against the costs of medical services. This usage includes private insurance and social insurance programs such as Medicare, which pools resources and spreads the financial risk associated with major medical expenses across the entire population to protect everyone, as well as social welfare programs such as Medicaid and the State Children's Health Insurance Program, which provide assistance to people who cannot afford health coverage. In addition to medical expense insurance, "health insurance" may also refer to insurance covering disability or long-term nursing or custodial care needs. Different health insurance provides different levels of financial protection and the scope of coverage can vary widely, with more than 40 percent of insured individuals reporting that their plans do not adequately meet their needs as of 2007.〔Consumer Reports, September 2007〕 The share of Americans with health insurance has been steadily declining since at least 2000. As of 2010 just under 84% of Americans had some form of health insurance, which meant that more than 49 million people went without coverage for at least part of the year. Declining rates of coverage and underinsurance are largely attributable to rising insurance costs and high unemployment. As the pool of people with private health insurance has shrunk, Americans are increasingly reliant on public insurance. Public programs now cover 31% of the population and are responsible for 44% of health care spending. Public insurance programs tend to cover more vulnerable people with greater health care needs. Many of the reforms instituted by the Affordable Care Act of 2010 were designed to extend health care coverage to those without it.〔("Income, Poverty, and Health Insurance Coverage in the United States: 2010." ) U.S. Census Bureau. Issued September 2011.〕 ==Enrollment and the Uninsured== According to the United States Census Bureau, roughly 55% obtain insurance through an employer, while about 10% purchase it directly. About 31% of Americans were enrolled in a public health insurance program: 14.5% (45 million – although that number has since risen to 48 million) had Medicare, 15.9% (49 million) had Medicaid, and 4.2% (13 million) had military health insurance (there is some overlap, causing percentages to add up to more than 100%).〔 Employers may also provide reimbursement for health insurance purchased individually by their employees through a Defined contribution health benefits plan. Employers are allowed to pay employees cash in lieu of health insurance, but this is uncommon as it is subject to strict IRS regulations.〔Spilman Ingots, ("Cash in Lieu of Health Insurance? Word to the Wise" )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Health insurance in the United States」の詳細全文を読む スポンサード リンク
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