The US health insurance market is highly concentrated, as leading insurers have carried out over 400 mergers from the mid-1990s to the mid-2000s (decade). In 2000, the two largest health insurers (Aetna and UnitedHealth Group) had total membership of 32 million. By 2006 the top two insurers, WellPoint (now Anthem) and UnitedHealth, had total membership of 67 million. The two companies together had more than 36% of the national market for commercial health insurance. The AMA has said that it "has long been concerned about the impact of consolidated markets on patient care." A 2007 AMA study found that in 299 of the 313 markets surveyed, one health plan accounted for at least 30% of the combined health maintenance organization (HMO)/preferred provider organization (PPO) market. In 90% of markets, the largest insurer controls at least 30% of the market, and the largest insurer controls more than 50% of the market in 54% of metropolitan areas.[116] The US Department of Justice has recognized this percentage of market control as conferring substantial monopsony power in the relations between insurer and physicians.[117]

Nearly one in three patients receiving NHS hospital treatment is privately insured and could have the cost paid for by their insurer. Some private schemes provide cash payments to patients who opt for NHS treatment, to deter use of private facilities. A report, by private health analysts Laing and Buisson, in November 2012, estimated that more than 250,000 operations were performed on patients with private medical insurance each year at a cost of £359 million. In addition, £609 million was spent on emergency medical or surgical treatment. Private medical insurance does not normally cover emergency treatment but subsequent recovery could be paid for if the patient were moved into a private patient unit.[44]
Private health insurance may be purchased on a group basis (e.g., by a firm to cover its employees) or purchased by individual consumers. Most Americans with private health insurance receive it through an employer-sponsored program. According to the United States Census Bureau, some 60% of Americans are covered through an employer, while about 9% purchase health insurance directly.[53] Private insurance was billed for 12.2 million inpatient hospital stays in 2011, incurring approximately 29% ($112.5 billion) of the total aggregate inpatient hospital costs in the United States.[12]
Private health care has continued parallel to the NHS, paid for largely by private insurance, but it is used by less than 8% of the population, and generally as a top-up to NHS services. There are many treatments that the private sector does not provide. For example, health insurance on pregnancy is generally not covered or covered with restricting clauses. Typical exclusions for Bupa schemes (and many other insurers) include:

eHealthInsurance is the nation's leading online source of health insurance. eHealthInsurance offers thousands of health plans underwritten by more than 180 of the nation's health insurance companies, including Aetna and Blue Cross Blue Shield. Compare plans side by side, get health insurance quotes, apply online and find affordable health insurance today.

Fringe benefits are generally included in an employee’s gross income (there are some exceptions). The benefits are subject to income tax withholding and employment taxes. Fringe benefits include cars and flights on aircraft that the employer provides, free or discounted commercial flights, vacations, discounts on property or services, memberships in country clubs or other social clubs, and tickets to entertainment or sporting events.

Health insurance companies are not actually providing traditional insurance, which involves the pooling of risk, because the vast majority of purchasers actually do face the harms that they are "insuring" against. Instead, as Edward Beiser and Jacob Appel have separately argued, health insurers are better thought of as low-risk money managers who pocket the interest on what are really long-term healthcare savings accounts.[131][132]
Individuals injured on the job while employed by private companies or state and local government agencies should contact their state workers' compensation board. The Department of Labor has several programs designed to prevent work-related injuries and illnesses. You may obtain information about these programs by visiting the Workplace Safety & Health page.
Medicare Supplement policies are designed to cover expenses not covered (or only partially covered) by the "original Medicare" (Parts A & B) fee-for-service benefits. They are only available to individuals enrolled in Medicare Parts A & B. Medigap plans may be purchased on a guaranteed issue basis (no health questions asked) during a six-month open enrollment period when an individual first becomes eligible for Medicare.[128] The benefits offered by Medigap plans are standardized.
Health insurance isn’t just about access to healthcare – it’s also about protection from financial ruin. Insurance can be expensive, but lacking coverage can cost much more. No one is invincible; anybody can be injured in a car accident, or receive an unexpected diagnosis. While it’s unclear whether poor health begets financial insecurity or vice versa, the correlation between not having health insurance and financial instability is indisputable. Indeed, medical debt is the leading cause of personal bankruptcy filings among Americans.

Efforts to pass a national pool were unsuccessful for many years. With the Patient Protection and Affordable Care Act, it became easier for people with pre-existing conditions to afford regular insurance, since all insurers are fully prohibited from discriminating against or charging higher rates for any individuals based on pre-existing medical conditions.[31][32] Therefore, most of the state-based pools shut down.[33] As of 2017, some remain due to statutes which have not been updated, but they also may cover people with gaps in coverage such as undocumented immigrants[33] or Medicare-eligible individuals under the age of 65.[33]

Health insurance premiums have risen dramatically over the past decade. In the past, insurers would price your health insurance based on any number of factors, but after the Affordable Care Act, the number of variables that impact your health insurance costs have been reduced dramatically. We conducted a study to look at how health insurance premiums vary based on these characteristics. In our data we illustrate these differences by using an example 21 year old. Older consumers will see higher rates with 30 year olds paying 1.135 times more, 40 year olds paying 1.278 times more, 50 year olds paying 1.786x and 64 year olds paying 2.714 times the cost listed.
A 2011 study found that there were 2.1 million hospital stays for uninsured patients, accounting for 4.4% ($17.1 billion) of total aggregate inpatient hospital costs in the United States.[12] The costs of treating the uninsured must often be absorbed by providers as charity care, passed on to the insured via cost-shifting and higher health insurance premiums, or paid by taxpayers through higher taxes.[13]