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NEDS Description of Data Elements
The Nationwide Emergency Department Sample (NEDS) is a set of hospital-based emergency department databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 
NEDS Description of Data Elements

The following links provide data elements descriptions for the Nationwide Emergency Department Sample (NEDS).

Data element descriptions explain how the data element is coded in the HCUP databases, what the uniform values are, and State-specific coding practices. The descriptions are cumulative across all States and years of NEDS data from 2006 to the current data year. Please note the following:
  • Not all data elements in the NEDS are uniformly coded across States. State-Specific notes are not available at this time.
  • Not all data elements in the NEDS are available from every State.
The NEDS are calendar year files based on discharge date for all data years except 2015. Because of the transition to ICD-10-CM/PCS on October 1, 2015, data elements related to diagnoses and procedures are included in files that are split into two parts. Nine months of the 2015 data with ICD-9-CM codes (ED visits from January 1, 2015 - September 30, 2015) are in one set of files labeled Q1Q3. Three months of 2015 data with ICD-10-CM/PCS codes (ED visits from October 1, 2015 - December 31, 2015) are in a separate set of files labeled Q4. All NEDS data elements are listed in alphabetical order below, showing the NEDS file location for years other than 2015 and for 2015. More information about the changes to the HCUP databases for ICD-10-CM/PCS and use of data across the two-coding systems may be found on the HCUP-US Web site under ICD-10-CM/PCS Resources.

For a description of how HCUP data elements are coded, and uniform values, check the corresponding boxes below and then click the "View Description of Data Elements".
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Abbreviations: DX, diagnosis; PR, procedure; Q1, discharge quarter 1; Q3, discharge quarter 3; Q4, discharge quarter 4.

HCUP Data Element Descriptive Title Years File(s) for years other than 2015 File(s) in 2015
Select All Data elements change frequently, and are only current as of the date generated.
AGE Age in years at admission 2006-2016 Core Core
AMONTH Admission month 2006-2016 Core Core
AWEEKEND Admission day is on a weekend 2006-2016 Core Core
CHRONn ICD-9-CM Chronic Condition Indicators 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
CPTCCSn Clinical Classifications Software (CCS): services and procedures classification 2008-2016 Supplemental ED Q1Q3 and Q4 Supplemental ED
CPTn CPT-4/HCPCS procedures 2006-2016 Supplemental ED Q1Q3 and Q4 Supplemental ED
DIED_VISIT Died in the ED, died in the hospital, or did not die 2006-2016 Core Core
DISCWT Weight to discharges in the universe 2006-2016 Core, Hospital, Supplemental ED (except 2011-2012, 2016), Supplemental Inpatient (except 2011-2012, 2016) Core, Hospital
DISP_ED Disposition from ED 2006-2016 Core Core
DISP_IP Disposition from inpatient discharge record 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
DQTR Discharge quarter 2006-2016 Core Core
DRG DRG in use on discharge date 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
DRG_NoPOA DRG in use on discharge date, calculated without POA 2008-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
DRGVER DRG or MS-DRG grouper version used on discharge date 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
DXCCSn Clinical Classifications Software (CCS): ICD-9-CM diagnosis classification 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
DXn ICD-9-CM Diagnosis 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
DXVER Diagnosis codes ICD version indicator 2015-2016 Core Q1Q3 and Q4 Supplemental ED
E_CCSn Clinical Classifications Software (CCS) for ICD-9-CM External Cause of Injury Code 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
ECODEn ICD-9-CM External Cause of Injury Code 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
EDevent Type of ED event 2006-2016 Core Core
FEMALE Indicator of sex 2006-2016 Core Core
HCUPFILE Source of HCUP Record (SID or SEDD) 2006-2016 Core, Supplemental ED (prior to 2011), Supplemental Inpatient (prior to 2011) Core, Q1Q3 and Q4 Supplemental ED, Q1Q3 and Q4 Supplemental Inpatient
HOSP_CONTROL Control/ownership of hospital 2006-2016 Hospital Hospital
HOSP_ED HCUP ED hospital identifier 2006-2016 Core, Hospital, Supplemental ED, Supplemental Inpatient Core, Hospital, Q1Q3 and Q4 Supplemental ED, Q1Q3 and Q4 Supplemental Inpatient
HOSP_REGION Region of hospital 2006-2016 Core (prior to 2011), Hospital Core, Hospital
HOSP_TRAUMA Hospital trauma level designation 2006-2016 Hospital Hospital
HOSP_UR_TEACH Teaching status of hospital 2006-2016 Hospital Hospital
HOSP_URCAT4 Hospital urban-rural designation 2006-2016 Hospital Hospital
HOSPWT Weight to hospitals in the universe 2006-2016 Hospital Hospital
I10_DXn ICD-10-CM Diagnosis 2015-2016 Core Q4 Supplemental ED, Q4 Supplemental Inpatient
I10_ECAUSEn ICD-10-CM External Cause of Morbidity Code 2015-2016 Core Q4 Supplemental ED, Q4 Supplemental Inpatient
I10_NDX Number of ICD-10-CM diagnoses on this discharge 2015-2016 Core Q4 Supplemental ED, Q4 Supplemental Inpatient
I10_NECAUSE Number of ICD-10-CM External Cause of Morbidity codes on this record 2015-2016 Core Q4 Supplemental ED, Q4 Supplemental Inpatient
I10_NPR_IP Number of procedures on the ED admission record 2015-2016 Supplemental Inpatient Q4 Supplemental ED, Q4 Supplemental Inpatient
I10_PR_IPn ICD-10-PCS procedure code 2015-2016 Supplemental Inpatient Q4 Supplemental ED, Q4 Supplemental Inpatient
INJURY Injury ICD-9-CM diagnosis reported on record 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_CUT Injury by cutting or piercing 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_DROWN Injury by drowning or submersion 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_FALL Injury by falling 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_FIRE Injury by fire, flame, or hot object 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_FIREARM Injury by firearm 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_MACHINERY Injury by machinery 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_MVT Injury by motor vehicle traffic, including the occupant of a car, motorcyclist, pedal cyclist, pedestrian, or unspecified person 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_NATURE Injury involving natural or environmental causes, including bites and stings 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_POISON Injury by poisoning 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_SEVERITY Injury severity score assigned by ICDPIC Stata program 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_STRUCK Injury involving being struck by or against something 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INJURY_SUFFOCATION Injury by suffocation 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INTENT_ASSAULT Injury by assault 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INTENT_SELF_HARM Intentional self harm indicated on the record (by diagnosis and/or E codes) 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
INTENT_UNINTENTIONAL Injury was unintentional 2009-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
KEY_ED HCUP NEDS record identifier 2006-2016 Core, Supplemental ED, Supplemental Inpatient Core, Q1Q3 and Q4 Supplemental ED, Q1Q3 and Q4 Supplemental Inpatient
LOS_IP Length of stay for inpatient stay 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
MDC MDC in effect on discharge date 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
MDC_NoPOA MDC in use on discharge date, calculated without POA 2009-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
MULTINJURY Multiple ICD-9-CM injuries reported 2009-2015 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
N_DISC_U Number of discharges in the universe for the stratum 2006-2016 Hospital Hospital
N_HOSP_U Number of hospitals in the universe for the stratum 2006-2016 Hospital Hospital
NCPT Number of CPT/HCPCS procedures for this discharge 2006-2016 Supplemental ED Q1Q3 and Q4 Supplemental ED
NDX Number of ICD-9-CM diagnoses on this discharge 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
NECODE Number of ICD-9-CM External of Cause of Injury Codes on this Record 2006-2015 Q3 Core Q1 and Q3 Supplemental ED, Q1 and Q3 Supplemental Inpatient (not in Q4)
NEDS_STRATUM Stratum used to sample hospital 2006-2016 Core, Hospital, Supplemental ED (2013-2014), Supplemental Inpatient (2013-2014) Core, Hospital
NPR_ED Number of procedures on the ED record 2006-2014 Supplemental ED  
NPR_IP Number of procedures on the ED inpatient record 2006-2015 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
PAY1 Expected primary payer, uniform 2006-2016 Core Core
PAY2 Expected secondary payer, uniform 2006-2016 Core Core
PCLASS_EDn Procedure class 2006-2014 Supplemental ED  
PCLASS_IPn Procedure class 2006-2015 Q3 Supplemental Inpatient Q1Q3 Supplemental Inpatient
PL_NCHS Patient Location: NCHS Urban-Rural Code 2013-2016 Core Core
PL_NCHS2006 Patient Location: NCHS Urban-Rural Code, 2006 2006-2012 Core  
PR_EDn ICD-9-CM procedure code 2006-2014 Supplemental ED  
PR_IPn ICD-9-CM procedure code 2006-2015 Q3 Supplemental Inpatient Q1Q3 Supplemental Inpatient
PRCCS_EDn Clinical Classifications Software (CCS): procedure classification 2006-2014 Supplemental ED  
PRCCS_IPn Clinical Classifications Software (CCS): procedure classification 2006-2015 Q3 Supplemental Inpatient Q1Q3 Supplemental Inpatient
PRVER Procedure codes ICD version indicator 2015-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
S_DISC_U Number of discharges in the sample for the stratum 2006-2016 Hospital Hospital
S_HOSP_U Number of hospitals in the sample for the stratum 2006-2016 Hospital Hospital
TOTAL_EDvisits Total number of ED visits from this hospital in the NEDS 2006-2016 Hospital Hospital
TOTCHG_ED Total charge for ED services 2006-2016 Core Core
TOTCHG_IP Total charge for ED and inpatient services 2006-2016 Supplemental Inpatient Q1Q3 and Q4 Supplemental Inpatient
YEAR Calendar year 2006-2016 Core, Hospital Core, Hospital
ZIPINC_QRTL Median household income for patient's ZIP Code (based on current year) 2006-2016 Core Core

Abbreviations: DX, diagnosis; PR, procedure; Q1, discharge quarter 1; Q3, discharge quarter 3; Q4, discharge quarter 4.

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Internet Citation: NEDS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). October 2018. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/neds/nedsdde.jsp.
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Last modified 10/17/18