ET3 Project

ET3: Emergency Triage, Treat, and Transport Model

The Center for Medicare and Medicaid Innovation’s (Innovation Center) Emergency Triage, Treat, and Transport (ET3) Model is a voluntary, five-year evaluation of a payment model that will provide greater flexibility to ambulance care teams to address emergency health care needs of Medicare beneficiaries following a 9-1-1 call. (Read Frequently Asked Questions about ET3 here: ET3 Frequently Asked Questions)

Support Materials

Questions and Answers

ET3 Questions and Answers with States – This document addresses questions raised regarding the implementation of ET3 in States and will be updated as more questions arise. (Updated 11/13/2020)

ET3 Q and A with State Officials (10-13-2020) – ET3 representatives facilitated a discussion concerning the impact to State Offices of EMS related to local EMS agencies participating in the ET3 Model.

Custom Elements and StateDataSet

NEMSIS v3 Custom Elements for the ET3 Model – There are several custom values added to eDisposition.12 and eDisposition.21 to adequately document transport to alternate destinations and treatment in place.


ET3 Data Flow Diagram – The diagram illustrates the flow of data from an EMS ePCR to the CMS Data Center. (Updated 09/18/2020)

ET3 Participation Agreement – The October release of the ET3 Participation Agreement. We provide this document to stakeholders because of the valuable information included regarding ET3 definitions, general model requirements, and an extensive overview of the ET3 interventions under evaluation.

ET3 Model Participant Billing and Payment Factsheet – This factsheet provides billing and payment instructions for ambulance suppliers and providers with whom CMS has executed an ET3 Model Participation Agreement (Participants).

ET3 V3 Implementation Tools

Return To V3 Map