Request Research Data


The 2020 NEMSIS Public-Release Research Dataset includes 43,488,767 EMS activations submitted by 12,319 EMS agencies serving 50 states and territories during the 2020 calendar year.

The dataset does not contain information that identifies patients, EMS agencies, receiving hospitals, or reporting states. EMS events submitted by states to NEMSIS do not necessarily represent all EMS events occurring within a state. In addition, states may vary in criteria used to determine the types of EMS events submitted to the NEMSIS dataset.

2020 Dataset Size

Access The News Release Here

A video training about the Data Cube and Public Release Research Dataset is available here and below. If you are new to the NEMSIS Public Release Research Dataset, this video will provide an overview of the dataset and resources including the data dictionary and user’s guide.

Access the Research Dataset Frequently Asked Questions document here: Research dataset FAQ

Request NEMSIS Public-Release Research Dataset Here: Request Form

To obtain a thumb drive containing the NEMSIS Public-Release Research Dataset complete a request form digitally. If a PDF form is preferred, please request the form via email and return via email or post mail the form with a written signature to:

NEMSIS Technical Assistance Center
University of Utah School of Medicine Department of Pediatrics
295 Chipeta Way, P.O. Box 581289
Salt Lake City, Utah 84158-1220

*Be advised that you may request a SINGLE YEAR of data for your initial request. Once you have started with that year successfully, you may request other years of data.

Access The Extraction Instructions Here

Data Quality

Much care was taken to ensure that the data are as clean as possible. All data submitted by states must comply with the XML standard and are exposed to several hundred error rules. However, for the most part, the NEMSIS TAC does not correct identified errors. The NEMSIS TAC does not have the resources to require states or agencies to correct errors retrospectively, but errors are reported to states, with hopes of future data refinement. Thus, the information contained in this dataset is provided as reported by states.

The 2020 NEMSIS Data User Manual

The NEMSIS Data User Manual indicates the data elements that are made available for research. Additional elements are protected from public use in their native form. These elements may only be made available with the express permission from each individual state or as “de-identified data elements” (specified by the HIPAA Privacy Rule) using statistical manipulation to mask and anonymize value codes. Masked value codes may be grouped to address specific hypotheses and made available to researchers through the use of the master Primary Key to link back to individual cases.

The list of states contributing to the 2020 Dataset can be found in the NEMSIS Data User Manual.

v3.4.0 Data Dictionary

This Data Dictionary provides details for the v3.4.0 EMS Data Standard and lists only the National Elements represented in the Public-Release Research Dataset.

Extended Data Definitions

Extended definitions for some NEMSIS elements are made available through a joint effort with the NASEMSO Data Managers Council (DMC) and the NEMSIS Technical Assistance Center. This document helps to define and clarify a subset of field values.

SAS Code File

The SAS code file provides sample code to create a table specification document for the dataset, a flat-file (at event level) for multi-response elements, and a re-format of data-time elements into a SAS date/time format.

NEMSIS Data Submissions by Year