National Emergency Department Inventories (NEDI)

The National ED Inventories (NEDI) are ongoing surveys that contain data on all EDs in a specific country/state/city, including facility location and annual visit volume.  Each inventory was developed through collaboration of a Country/State/City Coordinator with EMNet staff. 

U.S. Surveys

NEDI-USA: 2001, 2003, 2005, 2007, 2009, 2011, 2012, 2013
       Annual Surveys: 2015, 20162017, 2018, and 2019 (current survey)       

NEDI-New England: 2014 and 2018 (CT, MA, ME, NH, RI, VT)

NEDI-State: 2005 (MA), 2008 (CO, GA, MA, OR), and 2009 (AR, HI, MN, VT, WY)

NEDI-Indian Health Service: 2014 … 2019 (launch in 2020)

The number of U.S. EDs and annual U.S. ED visits for each year from 2001-2017 can be found here.

To learn about other ED inventory projects around the globe, visit the NEDI-International page here.

To learn about the applications of NEDI data in community projects, visit the Community page here.

If you have any questions about the NEDI projects, please contact us at