HCUP releases 2009 Nationwide Emergency Department Sample

Research Activities, December 2011, No. 376

The Healthcare Cost and Utilization Project (HCUP) released its 2009 Nationwide Emergency Department Sample (NEDS). The NEDS is the largest all-payer emergency department (ED) database in the United States. The NEDS was created to enable analyses of ED utilization patterns and support public health professionals, administrators, policymakers, and clinicians in their understanding and decisionmaking about this critical source of health care.

Constructed using records from both the HCUP State Emergency Department Databases and the State Inpatient Databases, the 2009 NEDS contains data from nearly 29 million ED visits and encompasses all encounter data from more than 950 hospital-based EDs in 29 States. It approximates a 20-percent stratified sample of EDs from community hospitals. Weights are provided to calculate national estimates pertaining to the approximately 130 million ED visits that took place in 2009. The NEDS provides information on "treat-and-release" ED visits, as well as ED visits in which the patient was admitted to the same hospital for further care.

The NEDS has many research applications as it contains information on hospital and patient characteristics, geographic region, and the nature of the ED visits (e.g., common reasons for ED visits, including injuries). The database includes information on all visits to the ED, regardless of payer—including persons covered by Medicare, Medicaid, private insurance, and the uninsured.

The 2009 NEDS can be purchased through the HCUP Central Distributor at http://hcup-us.ahrq.gov. More information about the NEDS can be found on the HCUP-US Web site at http://hcup-us.ahrq.gov/nedsoverview.jsp.

Current as of December 2011
Internet Citation: HCUP releases 2009 Nationwide Emergency Department Sample: Research Activities, December 2011, No. 376. December 2011. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/news/newsletters/research-activities/dec11/1211RA40.html