Health insurance is a sub division of insurance whereby the insurer pays the medical costs of the insured if the insured becomes sick due to covered causes, or due to accidents. The insurer may be a private organization or a government agency.

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, which is unlike life insurance where the premium to be paid is constant. 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. The medical history is also used to screen out persons with pre-existing medical conditions.

There is an intense competition between private health insurance companies. Some of them provides insurance for diabetics as well with free medical check- ups. Source: wiki