WASHINGTON – In a ground-breaking cross-agency collaboration, the U.S. Department of Housing and Urban Development (HUD) and the U.S. Department of Health and Human Services (HHS) produced the first-ever dataset of HUD-assisted households that includes Medicare and Medicaid claims data. Despite the potential usefulness of combining administrative data across agencies, such projects are rare and very difficult to bring to fruition. HUD and HHS looked specifically at data on people aged 65 and older. Although the data do not describe individuals, they can be used to study trends.