Starting in 2014, states received the option to expand Medicaid through the Affordable Care Act (ACA). Many states chose to expand Medicaid whereas others opted out. In this protocol, we describe a study to examine the impact of Medicaid expansion on mortality in the continental United States from 2015-2018. We adopt the matching structure of Mann et al. (2021) to estimate causal effects in this study. This protocol outlines both a standard method of analyzing this policy choice along with a method employing a novel weighting scheme to examine the effect of Medicaid expansion on those who stand to benefit most from policy implementation: the individuals newly eligible for Medicaid.