The Immigrant Access to Health and Human Services study maps and describes the policy context that can affect immigrant access to health and human services and the well-being of immigrants and their children. This paper summarizes federal provisions and key aspects of state-level variation related to immigrants' eligibility for TANF, SNAP, Medicaid, and CHIP based on a review of literature and the latest information. It provides a building block for the fieldwork and in-depth assessment of the policy context around immigrant access to health and human services.