Skip Navigation

NIS Description of Data Elements
The National (Nationwide) Inpatient Sample (NIS) is a set of longitudinal hospital inpatient databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 

NIS Description of Data Elements
The following links provide data elements descriptions for the National (Nationwide) Inpatient Sample (NIS). Record layouts for the NIS files are available under File Specifications.

Data element descriptions explain how the data element is coded in the HCUP databases and what are the uniform values. The descriptions are cumulative across all years of NIS data from 1988 to the current data year. Please note the following:

  • Not all data elements in the NIS are uniformly coded across States. Please check the "State Specific Notes" section for each data element before analysis.
  • Not all data elements in the NIS are available from every State.
  • Not all data elements are available each year.

For certain data elements such as, but not limited to, patient race (RACE) and total charges (TOTCHG), more than one percent of NIS records have missing values. Users are advised to review frequencies for all data elements planned for use in their analysis and to consider analytic methods for dealing with missing data. The HCUP Methods Series Report #2015-01 provides guidance on alternative approaches to handling missing data in the NIS.

The NIS 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 (discharges 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 (discharges from October 1, 2015 - December 31, 2015) are in a separate set of files labeled Q4. All NIS data elements are listed in alphabetical order below, showing the NIS 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 system 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 uniform values, check the corresponding boxes below and then click "View Description of Data Elements".

Check the corresponding boxes and then click

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.
ADAYWK Admission day of week 1988-1997 Core  
AGE Age in years at admission 1988-2016 Core Core
AGE_NEONATE Neonatal age (first 28 days after birth) indicator 2012-2016 Core Core
AGEDAY Age in days (when AGE is less than 1 year) 1988-2011 Core  
AHAID AHA hospital identifier 1988-2011 Hospital  
AMONTH Admission month 1988-2016 Core Core
APRDRG All Patient Refined DRG 2002-2016 Severity Q1Q3 and Q4 Severity
APRDRG_Risk_Mortality All Patient Refined DRG: Risk of Mortality Subclass 2002-2016 Severity Q1Q3 and Q4 Severity
APRDRG_Severity All Patient Refined DRG: Severity of Illness Subclass 2002-2015 Severity Q1Q3 and Q4 Severity
APSDRG All-Payer Severity-adjusted DRG 2002-2009 Severity  
APSDRG_Charge_Weight All-Payer Severity-adjusted DRG: Charge Weight 2002-2009 Severity  
APSDRG_LOS_Weight All-Payer Severity-adjusted DRG: Length of Stay Weight 2002-2009 Severity  
APSDRG_Mortality_Weight All-Payer Severity-adjusted DRG: Mortality Weight 2002-2009 Severity  
ASOURCE Admission source, uniform coding 1988-2011 Core  
ASOURCE_X Admission source, as received from source 1988-2011 Core  
ASOURCEUB92 Admission source, (UB-92 standard coding) 2003-2011 Core  
ATYPE Admission type 1988-2011 Core  
AWEEKEND Admission day is on a weekend 1998-2016 Core Core
BODYSYSTEMn ICD-9-CM Body system n 2014-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
CCSMGNn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - General 2005-2006 Dx_Pr_Grps  
CCSMSPn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - Detail 2005-2006 Dx_Pr_Grps  
CHRONn ICD-9-CM Chronic Condition Indicators 2005-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
CHRONBn Chronic Condition Indicators - body system 2005-2013 Dx_Pr_Grps  
CM_AIDS AHRQ comorbidity measure for ICD-9-CM codes: acquired immune deficiency syndrome 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_ALCOHOL AHRQ comorbidity measure for ICD-9-CM codes: alcohol abuse 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_ANEMDEF AHRQ comorbidity measure for ICD-9-CM codes: deficiency anemias 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_ARTH AHRQ comorbidity measure for ICD-9-CM codes: rheumatoid arthritis/collagen vascular diseases 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_BLDLOSS AHRQ comorbidity measure for ICD-9-CM codes: chronic blood loss anemia 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_CHF AHRQ comorbidity measure for ICD-9-CM codes: congestive heart failure 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_CHRNLUNG AHRQ comorbidity measure for ICD-9-CM codes: chronic pulmonary disease 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_COAG AHRQ comorbidity measure for ICD-9-CM codes: coagulopathy 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_DEPRESS AHRQ comorbidity measure for ICD-9-CM codes: depression 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_DM AHRQ comorbidity measure for ICD-9-CM codes: diabetes, uncomplicated 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_DMCX AHRQ comorbidity measure for ICD-9-CM codes: diabetes with chronic complications 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_DRUG AHRQ comorbidity measure for ICD-9-CM codes: drug abuse 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_HTN_C AHRQ comorbidity measure for ICD-9-CM codes: hypertension (combine uncomplicated and complicated) 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_HYPOTHY AHRQ comorbidity measure for ICD-9-CM codes: hypothyroidism 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_LIVER AHRQ comorbidity measure for ICD-9-CM codes: liver disease 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_LYMPH AHRQ comorbidity measure for ICD-9-CM codes: lymphoma 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_LYTES AHRQ comorbidity measure for ICD-9-CM codes: fluid and electrolyte disorders 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_METS AHRQ comorbidity measure for ICD-9-CM codes: metastatic cancer 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_NEURO AHRQ comorbidity measure for ICD-9-CM codes: other neurological disorders 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_OBESE AHRQ comorbidity measure for ICD-9-CM codes: obesity 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_PARA AHRQ comorbidity measure for ICD-9-CM codes: paralysis 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_PERIVASC AHRQ comorbidity measure for ICD-9-CM codes: peripheral vascular disorders 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_PSYCH AHRQ comorbidity measure for ICD-9-CM codes: psychoses 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_PULMCIRC AHRQ comorbidity measure for ICD-9-CM codes: pulmonary circulation disorders 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_RENLFAIL AHRQ comorbidity measure for ICD-9-CM codes: renal failure 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_TUMOR AHRQ comorbidity measure for ICD-9-CM codes: solid tumor without metastasis 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_ULCER AHRQ comorbidity measure for ICD-9-CM codes: peptic ulcer disease excluding bleeding 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_VALVE AHRQ comorbidity measure for ICD-9-CM codes: valvular disease 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
CM_WGHTLOSS AHRQ comorbidity measure for ICD-9-CM codes: weight loss 2002-2015 Q3 Severity Q1Q3 Severity (not in Q4)
D10CWT_U 10% sample weight to discharges in the universe 1988-1997 Hospital  
DCCHPRn Clinical Classifications Software: diagnosis classification 1988-1997 Core  
DIED Died during hospitalization 1988-2016 Core Core
DISCWT Weight to discharges in the universe 1998-2016 Core, Hospital Core, Hospital
DISCWT_F Weight to discharges in frame states 1988-1997 Hospital  
DISCWT_S Weight to discharges in state 1988-1997 Hospital  
DISCWT_U Weight to discharges in universe 1988-1997 Hospital  
DISCWT10 10% sample weight to discharges in the universe 1998-2004 Subsample  
DISCWTcharge Weight to discharges in the universe for national estimates of total charge in 2000. 2000 Core, Hospital  
DISCWTcharge10 10% sample weight to discharges in the universe for national estimates of total charge in 2000. 2000 Subsample  
DISP Disposition of patient 1988-1997 Core  
DISPUB04 Disposition of patient, UB04 standard coding 2007-2011 Core  
DISPUB92 Disposition of patient, UB92 coding 1998-2006 Core  
DISPUNIFORM Disposition of patient, uniform coding 1998-2016 Core Core
DQTR Discharge quarter 1988-2016 Core Core
DQTR_X Discharge quarter, as received from data source 2006-2011 Core  
DRG DRG in use on discharge date 1988-2016 Core Q1Q3 and Q4 Dx_Pr_Grps
DRG_NoPOA DRG in use on discharge date, calculated without POA 2008-2016 Core Q1Q3 and Q4 Dx_Pr_Grps
DRG10 DRG, Version 10 1988-1999 Core  
DRG18 DRG, Version 18 1998-2005 Core  
DRG24 DRG, Version 24 2006-2014 Core  
DRGVER DRG or MS-DRG grouper version used on discharge date 1988-2016 Core Q1Q3 and Q4 Dx_Pr_Grps
DS_DX_Category1 Disease Staging: Principal Disease Category 2002-2010 Severity  
DS_LOS_Level Disease Staging: Length of Stay Level 2002-2007 Severity  
DS_LOS_Scale Disease Staging: Length of Stay Scale 2002-2007 Severity  
DS_Mrt_Level Disease Staging:Mortality Level 2002-2007 Severity  
DS_Mrt_Scale Disease Staging: Mortality Scale 2002-2007 Severity  
DS_RD_Level Disease Staging: Resource Demand Level 2002-2007 Severity  
DS_RD_Scale Disease Staging: Resource Demand Scale 2002-2007 Severity  
DS_Stage1 Disease Staging: Stage of Principal Disease Category 2002-2010 Severity  
DSHOSPID Data source hospital number 1988-2011 Core  
DSNDX Maximum number of diagnoses provided by source 1988-1997 Core  
DSNPR Maximum number of procedures provided by source 1988-1997 Core  
DSNUM Date source identification number 1988-1997 Core  
DSTYPE Data source type 1988-1997 Core  
DXn ICD-9-CM Diagnosis 1988-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
DXCCSn Clinical Classifications Software (CCS): ICD-9-CM diagnosis classification 1998-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
DXMCCSn Multi-Level CCS for ICD-9-CM Diagnoses 2009-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
DXSYS Diagnosis coding system 1988-1997 Core  
DXVER Diagnosis codes ICD version indicator 2014-2016 Core Q1Q3 (not in Q4)
DXVn Diagnosis validity flag: Diagnosis n 1988-1997 Core  
E_CCSn Clinical Classifications Software (CCS) for ICD-9-CM External Cause of Injury Code 2003-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
E_MCCSn Multi-Level CCS for ICD-9-CM External Cause of Injury Code 2009-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
ECCSMGNn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - General 2005-2006 Dx_Pr_Grps  
ECODEn ICD-9-CM External Cause of Injury Code 2003-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
ELECTIVE Elective versus non-elective admission 2002-2016 Core Core
FEMALE Indicator of sex 1998-2016 Core Core
H_BEDSZ Bedsize of hospital (definition used prior to 1998) 1993-1997 Hospital  
H_CONTRL Control/ownership of hospital 1993-1997, 2008-2016 Hospital Hospital
H_LOC Location of hospital (definition used prior to 1998) 1993-1997 Hospital  
H_LOCTCH Location/teaching status of hospital (definition used prior to 1998) 1993-1997 Hospital  
H_REGION Hospital census region 1993-1997 Hospital  
H_TCH Hospital teaching status (definition used prior to 1998) 1993-1997 Hospital  
HCUP_ED HCUP indicator of emergency department record 2007-2016 Core Core
HFIPSSTCO Hospital FIPS State/County code 2004-2011 Hospital  
HOSP_BEDSIZE Bedsize of hospital 1998-2015 Hospital Hospital
HOSP_CONTROL Control/ownership of hospital 1998-2011 Hospital  
HOSP_DIVISION Census Division of hospital (STRATA) 2012-2016 Core, Hospital Core, Hospital
HOSP_LOCATION Location (urban/rural) of hospital 1998-2011 Hospital  
HOSP_LOCTEACH Location/teaching status of hospital 1998-2016 Hospital Hospital
HOSP_LPNFTEAPD LPN FTEs per 1000 adjusted inpatient days 2007-2011 Hospital  
HOSP_MHSCLUSTER Multi-hospital system cluster code 2007-2011 Hospital  
HOSP_MHSMEMBER Multi-hospital system membership 2007-2011 Hospital  
HOSP_NAFTEAPD Nurse aides per 1000 adjusted inpatient days 2007-2011 Hospital  
HOSP_NIS NIS hospital number 2012-2016 Core, Hospital, Severity, Dx_Pr_Grps(Dx_Pr_Grps file not available in 2016) Core, Hospital, Q1Q3 and Q4 Severity, Q1Q3 and Q4 Dx_Pr_Grps
HOSP_OPSURGPCT Percentage of all surgeries performed in the outpatient setting 2007-2011 Hospital  
HOSP_REGION Region of hospital 1998-2016 Hospital Hospital
HOSP_RNFTEAPD RN FTEs per 1000 adjusted inpatient days 2007-2011 Hospital  
HOSP_RNPCT Percentage of RNs among all nurses (RNs and LPNs) 2007-2011 Hospital  
HOSP_TEACH Teaching status of hospital 1998-2011 Hospital  
HOSPADDR Hospital address from AHA Annual Survey 1993-2011 Hospital  
HOSPBRTH ICD-9-CM diagnosis indicates in-hospital birth 2006-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
HOSPCITY Hospital city from AHA Annual Survey 1993-2011 Hospital  
HOSPID HCUP hospital identification number 1998-2011 Core, Hospital, Severity, Dx_Pr_Grps  
HOSPNAME Hospital name from AHA Annual Survey 1993-2011 Hospital  
HOSPST Hospital State postal code 1988-2011 Core, Hospital  
HOSPSTCO Hospital modified FIPS state/county code 1988-2011 Core (1988-2002), Hospital (2002-2011)  
HOSPWT Weight to hospitals in the universe 1998-2011 Hospital  
HOSPWT_F Weight to hospitals in the frame states 1988-1997 Hospital  
HOSPWT_S Weight to hospitals in the state 1988-1997 Hospital  
HOSPWT_U Weight to hospitals in the universe 1988-1997 Hospital  
HOSPZIP Hospital zip code from AHA Annual Survey 1993-2011 Hospital  
I10_DXn ICD-10-CM Diagnosis 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
I10_ECAUSEn ICD-10-CM External Cause of Morbidity Code 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
I10_NDX Number of ICD-10-CM diagnoses on this discharge 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
I10_NECAUSE Number of ICD-10-CM External Cause of Morbidity codes on this record 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
I10_NPR Number of ICD-10-PCS procedures on this discharge 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
I10_PRn ICD-10-PCS Procedure 2015 Q4, 2016 Core Q4 Dx_Pr_Grps
IDNUMBER Modified AHA hospital identifier 1988-2011 Hospital  
KEY Unique record identifier 1998-2011 Core, Severity, Dx_Pr_Grps  
KEY_NIS NIS record number 2012-2016 Core, Severity, Dx_Pr_Grps (Dx_Pr_Grps not available in 2016) Core, Q1Q3 and Q4 Severity, Q1Q3 and Q4 Dx_Pr_Grps
LOCTEACH Hospital location and teaching status 1988-1992 Hospital  
LOS Length of stay, cleaned 1988-2016 Core Core
LOS_X Length of stay, as received from data source 1988-2011 Core  
MDC MDC in effect on discharge date 1988-2016 Core Q1Q3 and Q4 Dx_Pr_Grps
MDC_NoPOA MDC in use on discharge date, calculated without POA 2009-2015 Core Q1Q3 and Q4 Dx_Pr_Grps
MDC10 MDC, Version 10 1988-1999 Core  
MDC18 MDC, Version 18 1998-2005 Core  
MDC24 MDC, Version 24 2006-2014 Core  
MDID_S Synthetic attending physician number 1988-2000 Core  
MDNUM1_R Physician 1 number (re-identified) 2003-2009 Core  
MDNUM1_S Physician 1 number (synthetic) 2001-2002 Core  
MDNUM2_R Physician 2 number (re-identified) 2003-2009 Core  
MDNUM2_S Physician 2 number (synthetic) 2001-2002 Core  
N_DISC_F Number of frame state discharges in STRATUM 1988-1997 Hospital  
N_DISC_S Number of state's discharges in STRAT_ST 1988-1997 Hospital  
N_DISC_U Number of discharges in the universe for the stratum 1988-2016 Hospital Hospital
N_HOSP_F Number of frame state hospitals in STRATUM 1988-1997 Hospital  
N_HOSP_S Number of state's hospitals in STRAT_ST 1988-1997 Hospital  
N_HOSP_U Number of hospitals in the universe for the stratum 1988-2016 Hospital Hospital
NCHRONIC ICD-9-CM Number of chronic conditions 2008-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
NDX Number of ICD-9-CM diagnoses on this discharge 1988-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
NECODE Number of ICD-9-CM External of Cause of Injury Codes on this Record 2003-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
NEOMAT Neonatal and/or maternal ICD-9-CM DX and/or PR 1988-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
NIS_STRATUM Stratum used to post-stratify hospital 1998-2016 Core (2000+), Hospital Core, Hospital
NPR Number of ICD-9-CM procedures on this discharge 1988-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
ORPROC Major operating room ICD-9-CM procedure indicator 2008-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
PAY1 Expected primary payer, uniform 1988-2016 Core Core
PAY1_N Expected primary payer, nonuniform 1988-1997 Core  
PAY1_X Expected primary payer, as received from data source 1998-2011 Core  
PAY2 Expected secondary payer, uniform 1988-2011 Core  
PAY2_N Expected secondary payer, nonuniform 1988-1997 Core  
PAY2_X Expected secondary payer, as received from data source 1998-2011 Core  
PCCHPRn Physician 1 number (synthetic) 1988-1997 Core  
PCLASSn ICD-9-CM Procedure class 2005-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
PL_NCHS Patient Location: NCHS Urban-Rural Code 2013-2016 Core Core
PL_NCHS2006 Patient Location: NCHS Urban-Rural Code, 2006 2007-2012 Core  
PL_UR_CAT4 Patient Location: Urban-Rural 4 Categories 2003-2006 Core  
PointOfOriginUB04 Point of origin for admission or visit, UB04 standard coding 2007-2011 Core  
PointOfOrigin_X Point of origin for admission or visit, as received from source 2007-2011 Core  
PRn ICD-9-CM Procedure 1988-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
PRCCSn Clinical Classifications Software (CCS) for ICD-9-CM Procedures 1998-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
PRDAYn Number of days from admission to procedure n 1988-2016 Core Q1Q3 Dx_Pr_Grps (not in Q4)
PRMCCSn Multi-Level CCS for ICD-9-CM Procedures 2009-2015 Q3 Dx_Pr_Grps Q1Q3 Dx_Pr_Grps (not in Q4)
PROCESS HCUP processing identification record number 1988-1997 Core  
PRSYS Procedure coding system 1988-1997 Core  
PRVER Procedure codes ICD version indicator 2015-2016 Core Not in Q4
PRVn Validity Flag: Procedure n 1988-1997 Core  
RACE Race 1988-2016 Core Core
S_DISC_S Number of sample discharges in STRAT_ST 1988-1997 Hospital  
S_DISC_U Number of discharges in the sample for the stratum 1988-2016 Hospital Hospital
S_HOSP_S Number of sample hospitals in STRAT_ST 1988-1997 Hospital  
S_HOSP_U Number of hospitals in the sample for the stratum 1988-2016 Hospital Hospital
SEQ Sequence number 1988-1997 Core  
SEQ_SID HCUP SID sequence number 1993-1997 Core  
SERVICELINE Service line based on ICD-9 codes 2014-2015 Q3 Core Q1Q3 Dx_Pr_Grps (not in Q4)
SEX Sex of the patient 1988-1997 Core  
ST_BEDSZ Bedsize category 1988-1992 Hospital  
ST_OWNER Ownership/control category 1988-1992 Hospital  
ST_REG Hospital census region 1988-1992 Hospital  
STRAT_ST Stratum for state-specific weights 1988-1997 Hospital  
STRATUM Stratum used to post-stratify hospital 1988-1997 Hospital  
SURGID_S Synthetic primary surgeon number 1988-2000 Core  
TOTAL_DISC Total hospital discharges 1998-2016 Hospital Hospital
TOTCHG Total charges, cleaned 1988-2016 Core Core
TOTCHG_X Total charges, as received from data source 1988-2011 Core  
TOTDSCHG Total hospital discharges 1988-1997 Hospital  
TRAN_IN Indicator of a transfer into the hospital 2008-2016 Core Core
TRAN_OUT Transfer out indicator 2010-2016 Core Core
YEAR Calendar year 1988-2016 Core, Hospital Core, Hospital
ZIPINC Median household income for patient's ZIP Code (based on 1999 demographics) 1998-2002 Core  
ZIPINC_QRTL Median household income for patient's ZIP Code (based on current year) 2003-2016 Core Core
ZIPINC4 Median income for patient's ZIP Code (4 categories) 1988-1997 Core  
ZIPINC8 Median income for patient's ZIP Code (8 categories) 1988-1997 Core  

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

Check the corresponding boxes and then click

Internet Citation: NIS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). August 2018. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nisdde.jsp.
Are you having problems viewing or printing pages on this Website?
If you have comments, suggestions, and/or questions, please contact hcup@ahrq.gov.
Privacy Notice, Viewers & Players
Last modified 8/13/18