INSURANCE QUOTESSTART HERE HMO Definition HMO one of the most common acronyms used. Health maintenance organization or HMO is a system that takes the financial risks of providing insurance to a certain geographical area. Health Insurance Articles Waiting Period Utilization Insurance: Tort Successive Periods All about Accident and Health Insurance Accident and Sickness Insurance State of Domicile Risk Retention Group Risk Management Residual Benefit Health Insurance Resources Health Insurance Definitions Health Insurance Q&A