Abstract
Although health maintenance organization (HMO) structures and databases are not uniform across plans, there are unique characteristics of HMO data in general that make them useful in examining health policy and delivery issues. The authors examine differences in data generated by different types of HMOs. After discussing why health services research using HMO data is needed by HMOs, other providers, practitioners, payers, and consumers of health care, the authors examine ways in which HMOs can provide sound answers to crucially important questions about the future of health care. They conclude that although the need for research on HMOs is compelling, researchers need to understand the information needs of HMOs and the incentives that are shaping the industry's approach to system delivery and clinical outcomes research. If HMOs do not take the lead in conducting health services research, they will diminish their role in shaping policies that will shape their future evolution.
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