Health insurance primarily protects individuals from the prohibitively high costs of surgical procedures, inpatient hospital care, and emergency attention. Though health insurance itself can become costly for a family, it is only a small fraction of the potential costs associated with unforeseen illnesses and emergencies (for example, the diagnosis and treatment of cancer or a heart attack).
Carrin, Guy; James, Chris (January 2005). "Social health insurance: Key factors affecting the transition towards universal coverage" (PDF). International Social Security Review. 58 (1): 45–64. doi:10.1111/j.1468-246x.2005.00209.x. Retrieved 10 March 2013. Initially the health insurance law of 1883 covered blue-collar workers in selected industries, craftspeople and other selected professionals.6 It is estimated that this law brought health insurance coverage up from 5 to 10 per cent of the total population.
HSAs are one form of tax-preferenced health care spending accounts. Others include Flexible Spending Accounts (FSAs), Archer Medical Savings Accounts (MSAs), which have been superseded by the new HSAs (although existing MSAs are grandfathered), and Health Reimbursement Accounts (HRAs). These accounts are most commonly used as part of an employee health benefit package. While there are currently no government-imposed limits to FSAs, legislation currently being reconciled between the House of Representatives and Senate would impose a cap of $2,500. While both the House and Senate bills would adjust the cap to inflation, approximately 7 million Americans who use their FSAs to cover out-of-pocket health care expenses greater than $2,500 would be forced to pay higher taxes and health care costs.
In addition to medical expense insurance, "health insurance" may also refer to insurance covering disability or long-term nursing or custodial care needs. Different health insurance provides different levels of financial protection and the scope of coverage can vary widely, with more than 40% of insured individuals reporting that their plans do not adequately meet their needs as of 2007.