The Agency for Healthcare Research and Quality’s (AHRQ’s) annual Medical Expenditure Panel Survey (MEPS) collects data on Americans’ health care expenditures and use. In seeking to understand connections between these topics and social determinants of health, AHRQ and Westat conducted a new MEPS supplemental study in 2021 using a multimode (web and paper) instrument. All other MEPS supplements had been administered only as paper questionnaires. Due to sensitive questions, participants were encouraged to complete the web survey, but had the option of responding by paper. Response was encouraged through a multimode contact strategy, including text messages, emails, and/or mailings. This …