Medical Insurance covers medical expenses and may be purchased on a group basis (e.g., by a firm to cover its employees) or by individual consumers. In each case, the covered groups or individuals pay premiums to help protect themselves from high or unexpected healthcare expenses. The composition of the Group – age, sex, health issues, etc. – along with coverage limits, deductibles, out-of-pocket maximums, copayments and other factors all combine to determine the monthly premium. Options are also available for Health Savings Accounts (HSA) and Health Reimbursement Account (HRA) plans.