The 2023 ESO EMS Index presents a technical report focusing on insights and best practices for emergency medical services (EMS) agencies. This year's Index aims to evaluate the performance of EMS organizations through a comprehensive analysis of data from over 2,600 agencies nationwide, encompassing more than 11 million EMS responses between January 1, 2022, and December 31, 2022. The document outlines key metrics such as stroke assessments, 12-lead EKG documentation for STEMI and NSTEMI, and the administration of ketamine with appropriate monitoring. Additionally, it highlights performance disparities related to patient demographics and emphasizes the importance of addressing these gaps to enhance equitable healthcare delivery. The report serves as a benchmark for EMS organizations to identify areas for improvement and to refine their operational practices in a post-pandemic environment, ensuring the provision of high-quality care to all patients. Overall, the Index is designed to inform strategies for optimizing patient outcomes and to facilitate ongoing quality management.