This report investigates the rapid enrollment growth of Medicare Health Maintenance Organizations (HMOs) and identifies the specific states where this growth is most concentrated. The United States Accounting Office (GAO) prepared this analysis, likely drawing on federal data and program statistics related to Medicare enrollment and the operations of HMOs. The report aims to provide an understanding of the factors driving this trend and its geographical distribution within the Medicare program.

This report is a government document focused on a specific aspect of Medicare policy. Its reception would likely be within policy circles, among healthcare administrators, and potentially among researchers studying healthcare economics and government programs. The authority perspective would emphasize its role as an official assessment of program trends and its utility for policymakers seeking to understand the landscape of Medicare HMOs.