Health insurance is an insurance product which covers medical and surgical expenses of an insured individual. It reimburses the expenses incurred due to illness or injury or pays the care provider of the insured individual directly.Health insurance is an insurance that covers the whole or a part of the risk of a person incurring medical expenses, spreading the risk over a large number of persons. By estimating the overall risk of health care and health system expenses over the risk pool, an insurer can develop a routine finance structure, such as a monthly premium or payroll tax, to provide the money to pay for the health care benefits specified in the insurance agreement.