The following databases are available to affiliated faculty, staff, and partners for health systems research:

Medicare and Medicaid Datasets

Medicare and Medicaid claims data are released by Center for Medicare and Medicaid Service (CMS) annually. Medicare data include claims for the use of inpatient, outpatient, and physician/supplier services for the elderly population, and Medicaid data include such claims for low income or disabled population. Claims contain Information on patient demographic characteristics, diagnoses, procedures, and cost for each use of health service. Part D drug data are also available since 2007 and can be linked to the claims data. Researchers can use these data to conduct studies on health outcomes, health care access, and health disparities. The Research Data Assistance Center (ResDAC) ( provides free technical support on how to use these data. Information on other related datasets and workshop schedule is also available on the ResDAC website. Under the contract with CMS, ResDAC handles all the requests for using these data.

Contact Xinhua Yu ( to inquire regarding research opportunities about using these data.

Medical Expenditure Panel Survey (MEPS)

Expenditure Panel Survey, which began in 1996, is a set of large-scale surveys of families and individuals, their medical providers (doctors, hospitals, pharmacies, etc.), and employers across the United States. MEPS collects data on the specific health services that Americans use, how frequently they use them, the cost of these services, and how they are paid for, as well as data on the cost, scope, and breadth of health insurance held by and available to U.S. workers. MEPS data collection is a joint effort of the Agency for Healthcare Research and Quality (AHRQ) and the National Center for Health Statistics (NCHS). Additional information on these files and public use files can be downloaded at

Contact Teresa Waters ( to inquire regarding research opportunities using these data.

Please submit information regarding available health systems research databases to the Center Coordinator, Celia Ridley ( for posting on the CHSI website.