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HCUP Nationwide Emergency Department Database (NEDS)

Metadata Updated: December 3, 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.

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 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 75% 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

Public: This dataset is intended for public access and use. License:

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Metadata Created Date December 3, 2020
Metadata Updated Date December 3, 2020
Issued 2010-04-01
Modified 2013-03-14

Metadata Source

Harvested from HHS CAS JSON

Additional Metadata

Resource Type Dataset
Metadata Created Date December 3, 2020
Metadata Updated Date December 3, 2020
Publisher Agency for Healthcare Research and Quality
Identifier 56396c85-45c9-418c-a20b-0e138305ca69
Issued 2010-04-01
Modified 2013-03-14
Theme Health Care Cost, Health Care Providers
Accesslevel public
Bureaucode 009:33
Dataquality True
Harvest Object Id 0c169497-b2fe-4298-8d8e-76d78e384362
Harvest Source Id 4ab0b426-459f-4f58-bb90-12da01e6694a
Harvest Source Title HHS CAS JSON
Programcode 009:000
Source Datajson Identifier True
Source Hash a57b7976395554e3fdff9faf6744966bc36ecdb7
Source Schema Version 1.0
Spatial National, regional
Temporal 2006-01-01/2010-12-31

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