The Medical Expenditure Panel Survey (MEPS) is a set of large-scale surveys of families and individuals, their medical providers, and employers across the United States. It is conducted by the Agency for Healthcare Research and Quality (AHRQ) and provides data on the cost and use of health care services, health insurance coverage, and quality of care. MEPS collects data on a wide range of topics, including demographics, health conditions, health care access and use, prescription drug use, and expenditures on health care services. The survey is conducted through a series of rounds of interviews over a two-year period, with participants providing information on their health care experiences and costs. Researchers use MEPS data to analyze trends in health care utilization and spending, disparities in access to care, and the impact of health policy changes on the population. MEPS data is widely used by policymakers, researchers, and health care professionals to inform decision-making and improve the quality and efficiency of health care delivery in the United States.