HCUP Nationwide Emergency Department Database (NEDS) Restricted Access File

Metadata Updated: November 12, 2020

The Nationwide Emergency Department Sample (NEDS) was created to enable analyses of emergency department (ED) utilization patterns and support public health professionals, administrators, policymakers, and clinicians in their decision-making regarding this critical source of care. The NEDS can be weighted to produce national estimates. Restricted access data files are available with a data use agreement and brief online security training. The NEDS is the largest all-payer ED database in the United States. It was constructed using records from both the HCUP State Emergency Department Databases (SEDD) and the State Inpatient Databases (SID), both also described in healthdata.gov. The SEDD capture information on ED visits that do not result in an admission (i.e., treat-and-release visits and transfers to another hospital). The SID contain information on patients initially seen in the emergency room and then admitted to the same hospital. The NEDS contains 25-30 million (unweighted) records for ED visits for over 950 hospitals and approximates a 20-percent stratified sample of U.S. hospital-based EDs. The NEDS contains information about geographic characteristics, hospital characteristics, patient characteristics, and the nature of visits (e.g., common reasons for ED visits, including injuries). The NEDS contains clinical and resource use information included in a typical discharge abstract, with safeguards to protect the privacy of individual patients, physicians, and hospitals (as required by data sources). It includes ED charge information for over 85% of patients, regardless of payer, including patients covered by Medicaid, private insurance, and the uninsured. The NEDS excludes data elements that could directly or indirectly identify individuals, hospitals, or states.

Access & Use Information

Restricted: This dataset can only be accessed or used under certain conditions. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources


Metadata Created Date November 10, 2020
Metadata Updated Date November 12, 2020

Metadata Source

Harvested from Healthdata.gov

Additional Metadata

Resource Type Dataset
Metadata Created Date November 10, 2020
Metadata Updated Date November 12, 2020
Publisher Agency for Healthcare Research and Quality, Department of Health & Human Services
Unique Identifier Unknown
Identifier 26887d97-e5da-4b40-893d-0cb9bebf1948
Data First Published 2012-11-11
Data Last Modified 2020-03-04
Rights N/A
Category Health, Quality, Medicare, Hospital, Inpatient, National
Public Access Level restricted public
Bureau Code 009:33
Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
Metadata Catalog ID https://healthdata.gov/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Data Quality True
Data Dictionary http://www.hcup-us.ahrq.gov/db/nation/neds/nedsdde.jsp
Homepage URL https://www.hcup-us.ahrq.gov/db/nation/neds/nedsdbdocumentation.jsp
Program Code 009:037
Source Datajson Identifier True
Source Hash 4f4e11fae37b2505203722158b9a877811d27586
Source Schema Version 1.1
Temporal 2006-01-02T00:00:00-05:00/2015-12-31T05:00:00-05:00

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