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The concept of health insurance was proposed in 1694 by Hugh the Elder Chamberlen from the Peter Chamberlen family. In the late 19th century, early health insurance was actually disability insurance, in the sense that it covered only the cost of emergency care for injuries that could lead to a disability[citation needed]. This payment model continued until the start of the 20th century in some jurisdictions (like California), where all laws regulating health insurance actually referred to disability insurance.[1] Patients were expected to pay all other health care costs out of their own pockets, under what is known as the fee-for-service business model. During the middle to late 20th century, traditional disability insurance evolved into modern health insurance programs. Today, most comprehensive private health insurance programs cover the cost of routine, preventive, and emergency health care procedures, and also most prescription drugs, but this was not always the case.

A health insurance policy is a legal, binding contract between the insurance company and the customer. The largest difference between private sector health insurance and life insurance is that for life insurance, a person may purchase guaranteed renewable insurance for the whole of the insured's life at a constant premium rate, while health insurance is generally purchased year by year with generally no assurance of renewability and if renewable no guarantee that premium rates will not increase.

Before buying health insurance, a person typically fills out a comprehensive medical history form that asks whether the person smokes, how much the person weighs, and has the person ever been treated for any of a long list of diseases. Applicants can get discounts if they do not smoke and live a healthy lifestyle, which might encourage some people to quit smoking or make other improvements in their lifestyle. The medical history is also used to screen out persons with pre-existing medical conditions.

The following is a hypothetical example of a situation that might confront an insurance company: Suppose that a large number of customers of a particular insurance company contracted a rare disease and the hospital charged 10 million dollars a patient to treat them. The insurance company would then be faced with a choice of paying all claims without complaint (thus losing money and possibly going out of business) or denying the claims (thus outraging patients and their families, discouraging potential customers, and becoming a target for lawsuits and legislation).

Health insurance companies use the term "adverse selection" to describe the tendency for sick people to be more likely to sign up for health insurance.

Ex-post moral hazard is in essence the consequence of reduced prices for medical care. Since most insurance plans, whether public or private, reduce the out-of pocket cost of medical care, the behavior of individuals will be affected by those reduced prices. In the same way that people treat water with little care when it is very inexpensive, people will also tend to over-use medical care when the out-of pocket costs are small. Of course, medical care still needs to be financed, and so taxes or premiums will be higher than the optimal amount. This inflation of taxes or premiums to cover the choices made under subsidized prices is what is termed ex-post moral hazard, and is a different phenomena than the ex-ante moral hazard mentioned above.

With publicly funded health insurance the good and the bad risks all receive coverage without regard to their health status, which eliminates the problem of adverse selection, although it introduces a problem of moral hazard.

Insurance companies also say that if more healthy people buy health insurance, but few sick people buy it, the price drops. In other words, the price drops if more money goes in and less is paid out.

Because of advances in medicine and medical technology, medical treatment is more expensive, and people in developed countries are living longer. The population of those countries is aging, and a larger group of senior citizens requires more medical care than a young healthier population. (A similar rise in costs is evident in Social Security in the United States.) These factors cause an increase in the price of health insurance.

Some other factors that cause an increase in health insurance prices are health related: insufficient exercise; unhealthy food choices; a shortage of doctors in impoverished or rural areas; excessive alcohol use, smoking, street drugs, obesity, among some parts of the population; and the modern sedentary lifestyle of the middle classes.

In theory, people could lower health insurance prices by doing the opposite of the above; that is, by exercising, eating healthy food, avoiding addictive substances, etc. Healthier lifestyles protect the body from some, although not all, diseases, and with fewer diseases, the expenses borne by insurance companies would likely drop.

Under these circumstances, the consumer would hope to benefit from the savings; however, critics of private health insurance claim that too much of the insurance premiums are paid out in executive salaries or retained as profits by the company.

Medicare

In the United States, government-funded Medicare programs help to insure the elderly and end stage renal disease patients. Some health care economists (Ewe Reinhardt of Princeton and Stuart Butler among others) assert that (the third party payment feature) these programs have had the unintended consequence of distorting the price of medical procedures. As a result, HCFA (the Health Care Financing Administration) has set up a list of procedures and corresponding prices under the Resource-Based Relative Value Scale (RBRVS).

Starting in 2006, Medicare Part D provides a program for the elderly to buy insurance for the purchase of prescription drugs.

Medicare Advantage

Medicare Advantage expands the health care options for Medicare beneficiaries. Medicare Advantange was born from the the Balanced Budget Act of 1997 in order to better control the rapid growth in Medicare spending, as well as to provide Medicare beneficiaries more choices

Health Savings Accounts

Effective January 1, 2004, U.S. Congress passed a new law which provides broad access to Health Savings Accounts which allow consumers to pay for qualified medical expenses with pre-tax dollars and save for retirement on a tax-deferred basis.

Medicaid

While Medicaid was instituted for the very poor, beginning in 1972, the number of individuals in the United States who lacked any form of health insurance for any period during the year increased each year, every year with the exceptions of the years 1999 and 2000. It has been reported that the number of physicians accepting Medicaid has decreased in recent years due to relatively high administrative costs and low reimbursements.