The Emergency Triage, Treat, and Transport (ET3) model aims to enhance emergency medical services by allowing Medicare beneficiaries to receive appropriate care in lower-acuity settings rather than traditional emergency departments. The document outlines the model's application process, eligibility criteria, payment structures, and intervention designs, emphasizing stakeholder collaboration and patient-centered care. Key components for applicants include demonstrating compliance, interoperability plans, and engagement with various payers to successfully implement the model.