Coverage limits: Some health insurance policies only pay for health care up to a certain dollar amount. The insured person may be expected to pay any charges in excess of the health plan's maximum payment for a specific service. In addition, some insurance company schemes have annual or lifetime coverage maxima. In these cases, the health plan will stop payment when they reach the benefit maximum, and the policy-holder must pay all remaining costs.
Since people who lack health insurance are unable to obtain timely medical care, they have a 40% higher risk of death in any given year than those with health insurance, according to a study published in the American Journal of Public Health. The study estimated that in 2005 in the United States, there were 45,000 deaths associated with lack of health insurance.[14] A 2008 systematic review found consistent evidence that health insurance increased utilization of services and improved health.[15]

Health insurance absorbs or offsets healthcare costs associated with, but not limited to, routine health examinations, specialist referral visits, inpatient and outpatient surgery, unforeseen eventualities such as illnesses or injuries, and prescription medication. Health insurance policies are categorized as privately paid for by an individual, publicly provided as a service through Social Security, or commercially arranged by a company as part of an employee benefit package.
Critics said that "Exemptions would lead to market instability and higher premiums in the traditional small-group market. AHPs exempt from state regulation and oversight would enable them to be more selective about who they cover. They will be less likely to cover higher-risk populations, which would cause an imbalance in the risk pool for other small business health plans that are part of the state small group risk pool. Adverse selection would likely abound and Association Health Plans would be selling an unregulated product alongside small group plans, which creates an unlevel playing field."[79] According to the Congressional Budget Office (CBO), "[p]remiums would go up for those buying in the traditional small-group market." competing against AHPs that offer less expensive and less comprehensive plans.[79][82]
Prior to the Patient Protection and Affordable Care Act, effective from 2014, about 34 states offered guaranteed-issuance risk pools, which enabled individuals who are medically uninsurable through private health insurance to purchase a state-sponsored health insurance plan, usually at higher cost, with high deductibles and possibly lifetime maximums.[30] Plans varied greatly from state to state, both in their costs and benefits to consumers and in their methods of funding and operations. The first such plan was implemented In 1976.[30]
Health insurance primarily protects individuals from the prohibitively high costs of surgical procedures, inpatient hospital care, and emergency attention. Though health insurance itself can become costly for a family, it is only a small fraction of the potential costs associated with unforeseen illnesses and emergencies (for example, the diagnosis and treatment of cancer or a heart attack).
^ Bump, Jesse B. (19 October 2010). "The long road to universal health coverage. A century of lessons for development strategy" (PDF). Seattle: PATH. Retrieved 10 March 2013. Carrin and James have identified 1988—105 years after Bismarck's first sickness fund laws—as the date Germany achieved universal health coverage through this series of extensions to minimum benefit packages and expansions of the enrolled population. Bärnighausen and Sauerborn have quantified this long-term progressive increase in the proportion of the German population covered by public and private insurance. Their graph is reproduced below as Figure 1: German Population Enrolled in Health Insurance (%) 1885–1995.
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% of insured individuals reporting that their plans do not adequately meet their needs as of 2007.[2]