Shoff C, et al. - Community-level factors associated with Emergency Department (ED) admission rates were determined and how these factors vary across geography was assessed. Using 2012 data from 100% of U.S. Medicare Fee-for-Service beneficiaries, researchers calculated county-level ED admission rates, adjusted by Hierarchical Condition Categories to control for patient health in this ecological study. Outcomes suggest that communities differ regarding the association between healthcare market concentration, healthcare delivery, and socioeconomic factors with ED admissions in Medicare beneficiaries. This suggests the significance of considering specific community contexts while planning policy and interventions to reduce ED admissions.