Notes: HMO enrollment includes enrollees in both traditional HMOs and point-of-service (POS) plans through: group/commercial plans, Medicare, Medicaid, the Federal Employees Health Benefits Program, direct pay plans, and unidentified HMO products. Percentages may not add to 100% due to rounding. Data are as of June 30 or July 1 of respective year. See “Health Maintenance Organization” in Glossary for definitions of model types (Mixed, IPA, Network, Group, and Staff).

Source: Kaiser Family Foundation, Trends and Indicators in the Changing Health Care Marketplace, 2002, May 2002, Exhibit 2.5, p.20, at http://www.kff.org/insurance/3161-index.cfm, based on July 1 data from InterStudy Publications, updated with data from HealthLeaders-InterStudy, The Competitive Edge, Spring 2005, Part II: Managed Care Industry Report, June 2005, Table 7, p.30.