71 Nationwide Emergency Department Sample (NEDS)

71.1 Organization

Agency for Healthcare Research and Quality (AHRQ), HHS

71.3 Description

  • HIPPA-compliant, patient-level
  • Discharge data for ED visits from 953 hospitals located in 34 States and the District of Columbia, approximating a 20-percent stratified sample of U.S. hospital-based EDs.
  • Includes data on 1ry and 2ry diagnoses and procedures, discharge status, demographics, hospital characteristics, expected payment source, total charges, length of stay and severity and comorbidity measures
  • Can be used to study use of and charges of ED services, medical treatment effectiveness, quality of ED care, impact of policy changes, access to care, utilization of services and trends among other things.
  • Four data files per year (Core, Hospital, Severity and Diagnosis/Procedure) except for 2015 which has 6 (Severity and Diagnosis/Procedure split into 2 each)

71.4 Vintage/Release Frequency

Annual since 2006

71.5 Observational Unit

Emergency department encounter level

71.6 Collection Methodology

  • Sampled from the State Inpatient Databases (SID) and the State Emergency Department Databases (SEDD). SID contains information on patients initially seen in the ED and then admitted and the SEDD captures information on ED visits that do not result in admission.
  • 20% stratified sample of hospital-owned EDs in the US (States and DC)
  • Stratification is based on geographic region, trauma center designation, urban-rural location, teaching hospitals and hospital ownership or control.
  • Data obtained from inpatient discharge abstracts provided by participating organizations and then translated into a uniform format.

71.7 Available at

Available for purchase by year. CPHR currently has 2006-2019.

71.9 Cost

Cost varies by year

71.10 Proposal or Application required?

Application form required

71.11 DUA required?

Yes

71.12 Special Notes

  • Query and classify patients using ICD
  • Up to the 3rd quarter of 2015, diagnosis and procedure codes are coded using ICD-9. In the 4th quarter of 2015 the transition to ICD-10 is done. Because of this the file structure for 2015 is different than previous years.
  • You cannot track a particular patient across multiple admissions
  • All users must complete a Data Use Agreement Training and sign a DUA
  • Before publishing with any HCUP database, ensure manuscript follows requirements of the HCUP DUA and includes the appropriate citation (see https://www.hcup- us.ahrq.gov/db/publishing.jsp)