The independent source for health policy research, polling, and news.
KFF’s policy research provides facts and analysis on a wide range of policy issues and public programs.
KFF designs, conducts and analyzes original public opinion and survey research on Americans’ attitudes, knowledge, and experiences with the health care system to help amplify the public’s voice in major national debates.
KFF Health News is a national newsroom that produces in-depth journalism about health issues and is one of the organization’s core operating programs.
Projected Change in Medicare Enrollment, 2000-2050 Download Source 2013 Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical Insurance Trust Funds.
Medicare Enrollment, 1970-2035 Download Source 2013 Annual Report of the Boards of Trustees of the Federal Hospital Insurance and Federal Supplementary Medical Insurance Trust Funds.
Medicare Enrollment, 1966-2013 Download Source Centers for Medicare & Medicaid Services, Medicare Enrollment: Hospital Insurance and/or Supplemental Medical Insurance Programs for Total, Fee-for-Service and Managed Care Enrollees as of July 1, 2011: Selected Calendar Years 1966-2011; 2012-2013, HHS Budget in Brief, FY2014.
Share of Medicare Beneficiaries Enrolled in Medicare Advantage Plans, by State, 2013 Download Source MPR/Kaiser Family Foundation analysis of CMS State/County Market Penetration Files, 2013.
Dually eligible beneficiaries comprise 20% of the Medicare population and 15% of the Medicaid population, 2008 Download Source Kaiser Family Foundation analysis of the Medicare Current Beneficiary Survey 2008, and Kaiser Commission on Medicaid and the Uninsured and Urban Institute estimates based on data from FY2008 MSIS and CMS Form-64.
Distribution of Enrollment in Medicare Advantage Plans, by Plan Type, 2013 Download Source MPR / KFF analysis of the Centers for Medicare and Medicaid Services (CMS) Medicare Advantage enrollment files, 2013.
Medicare Beneficiaries as a Percent of State Populations, 2012 Download Source Calculation based on Kaiser Family Foundation analysis of the CMS State/County Market Penetration file, March 2012; and 2011 population estimates from the United States Census Bureau.
This Data Snapshot provides 50-state data on Medicaid monthly enrollment trends, adding June 2013 data. Overall, Medicaid enrollment growth continued to slow to the lowest rate since the start of the Great Recession as the economic conditions continued to slowly improve. While enrollment growth rates have been trending downward as economic conditions continue to slowly improve, enrollment growth is expected to increase significantly as states implement the ACA. Regardless of whether states decide to implement the Medicaid expansion or not, enrollment is anticipated to grow on average across all states due to new streamlined eligibility and enrollment processes as well as outreach for new coverage. This report provides baseline data for understanding the impact of the ACA eligibility and enrollment policies on enrollment growth across states.
To learn more about the early ACA enrollment experience in two states, the Kaiser Commission on Medicaid and the Uninsured and PerryUndem Research and Communication conducted focus groups in Baltimore, Maryland and Reno, Nevada in November 2013 with low- and moderate-income individuals who recently applied for health insurance and consumer assisters trained to help individuals enroll. This study builds on previous work that examined preparations for open enrollment in several states, including Maryland and Nevada, which are both moving forward with the ACA’s Medicaid expansion to low-income adults and have established their own State-based Marketplace (SBM). The focus group discussions included adults who had successfully applied as well as consumer assisters.This brief provides key findings about the early ACA enrollment experience in Baltimore, Maryland and Reno, Nevada based on focus group discussions with these recent applicants and enrollment assisters.
The Centers for Medicare & Medicaid Services (CMS) recently established 12 new Medicaid and CHIP eligibility and enrollment performance indicators for states to report beginning in October 2013. These indicators provide insight into the performance of new eligibility and enrollment policies established under the Affordable Care Act (ACA). In December 2013, CMS released initial reports for a subset of the indicators. This brief provides an overview of the new performance indicators; the initial data; and the opportunities and challenges associated with reporting, analyzing, and interpreting the data.
© 2026 KFF