The term health insurance refers to a wide variety of insurance policies. These range from policies that cover the costs of doctors and hospitals to those that meet a specific need, such as paying for long-term care. Even disability insurance - which replaces lost income if you can't work because of illness or accident - is considered health insurance, even though it's not specifically for medical expenses.
But when people talk about health insurance, they usually mean the kind of insurance offered by employers to employees, the kind that covers medical bills, surgery, and hospital expenses. You may have heard this kind of health insurance referred to as comprehensive or major medical policies, alluding to the broad protection they offer. But the fact is, neither of these terms is particularly helpful to the consumer.