An HMO Health Insurance plan stands for Health Maintenance Organization.  This is HMO Health Insurance Plan is a type of Managed Care Organization (MCO).  This is the oldest form of managed care plan.  The HMO Health Insurance plan allows users to pay separately for each service they recieve in advance.  The HMO Health Insurance plan offers a range of health benefits for a monthly fee usually including preventive care. The HMO plan will provide its users a list of doctors including a primary care physician, who will coordinate your care.  With HMO Health Insuranc plans, there is usually a copayment involved for doctors visits including hospitalization and other health services.