This Viewpoint reviews Centers for Medicare and Medicaid Services’ Emergency Triage, Treat, and Transport (ET3) model, a voluntary payment model that will reimburse emergency medical service (EMS) agencies for handling 911 calls with non–emergency department dispositions including on-scene or telemedicine treatment and transport to alternative sites (urgent care clinics, physician offices, behavioral health centers), and outlines the patient safety, quality, and regulatory issues that must be...