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KID Description of Data Elements
The Kids' Inpatient Database (KID) is a set of pediatric hospital inpatient databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 

KID Description of Data Elements

The following links provide data elements descriptions for the Kids' Inpatient Database (KID).

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 KID data from 1997 to the current data year. Please note the following:

  • Not all data elements in the KID are uniformly coded across States. Please check the "State Specific Notes" section for each data element before analysis.
  • Not all data elements in the KID are available from every State.
  • Not all data elements are available each year. Please check the Availability of Data Elements by year table.

For a description of how HCUP data elements are coded, restriction on use, uniform values, and state-specific coding practices, 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)
Select All Data elements change frequently, and are only current as of the date generated.
ADAYWK Admission day of week 1997 Core
AGE Age in years at admission 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
AGEDAY Age in days (when AGE is less than 1 year) 1997, 2000, 2003, 2006, 2009 Core
AGEMONTH Age in months (when AGE is less than 11 years) 1997, 2000, 2003, 2006, 2009 Core
AGE_NEONATE Neonatal age (first 28 days after birth) indicator 2012, 2016 Core
AHAID AHA hospital identifier 2000, 2003, 2006, 2009 Hospital
AMONTH Admission month 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
APRDRG All Patient Refined DRG 2003, 2006, 2009, 2012, 2016 Severity
APRDRG_Risk_Mortality All Patient Refined DRG: Risk of Mortality Subclass 2003, 2006, 2009, 2012, 2016 Severity
APRDRG_Severity All Patient Refined DRG: Severity of Illness Subclass 2003, 2006, 2009, 2012, 2016 Severity
APSDRG All-Payer Severity-adjusted DRG 2003, 2006, 2009 Severity
APSDRG_Charge_Weight All-Payer Severity-adjusted DRG: Charge Weight 2003, 2006, 2009 Severity
APSDRG_LOS_Weight All-Payer Severity-adjusted DRG: Length of Stay Weight 2003, 2006, 2009 Severity
APSDRG_Mortality_Weight All-Payer Severity-adjusted DRG: Mortality Weight 2003, 2006, 2009 Severity
ASOURCE Admission source, uniform coding 1997, 2000, 2003, 2006, 2009 Core
ASOURCE_X Admission source, as received from source 2000, 2003, 2006, 2009 Core
ASOURCEUB92 Admission source, (UB-92 standard coding) 2003, 2006, 2009 Core
ATYPE Admission type 1997, 2000, 2003, 2006, 2009 Core
AWEEKEND Admission day is on a weekend 2000, 2003, 2006, 2009, 2012, 2016 Core
BWT Birth weight in grams 2000, 2003, 2006, 2009 Core
CCSMGNn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - General 2006 DX_PR_Grps
CCSMSPn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - Detail 2006 DX_PR_Grps
CHLDWT Weight to pediatric non-births in universe for estimates other than total charges 2000 Hospital
CHLDWTCHARGE Weight to pediatric non-births in universe for total charge estimates 2000 Hospital
CHLDWT_U Weight to pediatric non-births in universe 1997 Hospital
CHRONBn Chronic Condition Indicators - body system 2006, 2009, 2012 DX_PR_Grps
CHRONn ICD-9-CM Chronic Condition Indicators 2006, 2009, 2012 DX_PR_Grps
CM_AIDS AHRQ comorbidity measure for ICD-9-CM codes: acquired immune deficiency syndrome 2003, 2006, 2009, 2012 Severity
CM_ALCOHOL AHRQ comorbidity measure for ICD-9-CM codes: alcohol abuse 2003, 2006, 2009, 2012 Severity
CM_ANEMDEF AHRQ comorbidity measure for ICD-9-CM codes: deficiency anemias 2003, 2006, 2009, 2012 Severity
CM_ARTH AHRQ comorbidity measure for ICD-9-CM codes: rheumatoid arthritis/collagen vascular diseases 2003, 2006, 2009, 2012 Severity
CM_BLDLOSS AHRQ comorbidity measure for ICD-9-CM codes: chronic blood loss anemia 2003, 2006, 2009, 2012 Severity
CM_CHF AHRQ comorbidity measure for ICD-9-CM codes: congestive heart failure 2003, 2006, 2009, 2012 Severity
CM_CHRNLUNG AHRQ comorbidity measure for ICD-9-CM codes: chronic pulmonary disease 2003, 2006, 2009, 2012 Severity
CM_COAG AHRQ comorbidity measure for ICD-9-CM codes: coagulopathy 2003, 2006, 2009, 2012 Severity
CM_DEPRESS AHRQ comorbidity measure for ICD-9-CM codes: depression 2003, 2006, 2009, 2012 Severity
CM_DM AHRQ comorbidity measure for ICD-9-CM codes: diabetes, uncomplicated 2003, 2006, 2009, 2012 Severity
CM_DMCX AHRQ comorbidity measure for ICD-9-CM codes: diabetes with chronic complications 2003, 2006, 2009, 2012 Severity
CM_DRUG AHRQ comorbidity measure for ICD-9-CM codes: drug abuse 2003, 2006, 2009, 2012 Severity
CM_HTN_C AHRQ comorbidity measure for ICD-9-CM codes: hypertension (combine uncomplicated and complicated) 2003, 2006, 2009, 2012 Severity
CM_HYPOTHY AHRQ comorbidity measure for ICD-9-CM codes: hypothyroidism 2003, 2006, 2009, 2012 Severity
CM_LIVER AHRQ comorbidity measure for ICD-9-CM codes: liver disease 2003, 2006, 2009, 2012 Severity
CM_LYMPH AHRQ comorbidity measure for ICD-9-CM codes: lymphoma 2003, 2006, 2009, 2012 Severity
CM_LYTES AHRQ comorbidity measure for ICD-9-CM codes: fluid and electrolyte disorders 2003, 2006, 2009, 2012 Severity
CM_METS AHRQ comorbidity measure for ICD-9-CM codes: metastatic cancer 2003, 2006, 2009, 2012 Severity
CM_NEURO AHRQ comorbidity measure for ICD-9-CM codes: other neurological disorders 2003, 2006, 2009, 2012 Severity
CM_OBESE AHRQ comorbidity measure for ICD-9-CM codes: obesity 2003, 2006, 2009, 2012 Severity
CM_PARA AHRQ comorbidity measure for ICD-9-CM codes: paralysis 2003, 2006, 2009, 2012 Severity
CM_PERIVASC AHRQ comorbidity measure for ICD-9-CM codes: peripheral vascular disorders 2003, 2006, 2009, 2012 Severity
CM_PSYCH AHRQ comorbidity measure for ICD-9-CM codes: psychoses 2003, 2006, 2009, 2012 Severity
CM_PULMCIRC AHRQ comorbidity measure for ICD-9-CM codes: pulmonary circulation disorders 2003, 2006, 2009, 2012 Severity
CM_RENLFAIL AHRQ comorbidity measure for ICD-9-CM codes: renal failure 2003, 2006, 2009, 2012 Severity
CM_TUMOR AHRQ comorbidity measure for ICD-9-CM codes: solid tumor without metastasis 2003, 2006, 2009, 2012 Severity
CM_ULCER AHRQ comorbidity measure for ICD-9-CM codes: peptic ulcer disease excluding bleeding 2003, 2006, 2009, 2012 Severity
CM_VALVE AHRQ comorbidity measure for ICD-9-CM codes: valvular disease 2003, 2006, 2009, 2012 Severity
CM_WGHTLOSS AHRQ comorbidity measure for ICD-9-CM codes: weight loss 2003, 2006, 2009, 2012 Severity
CMPBWT Weight to complicated births in universe for estimates other than total charges 2000 Hospital
CMPBWT_U Weight to complicated births in universe 1997 Hospital
CMPBWTCHARGE Weight to complicated births in universe for total charge estimates 2000 Hospital
DCCHPRn Clinical Classifications Software: diagnosis classification 1997 Core
DIED Died during hospitalization 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
DISCWT Weight to discharges in the universe 2000, 2003, 2006, 2009, 2012, 2016 Core
DISCWT_U Weight to discharges in universe 1997 Core, Hospital
DISCWTcharge Weight to discharges in the universe for national estimates of total charge in 2000. 2000 Core
DISP Disposition of patient 1997 Core
DISPUB04 Disposition of patient, UB04 standard coding 2009 Core
DISPUB92 Disposition of patient, UB92 coding 2003, 2006, 2009 Core
DISPUNIFORM Disposition of patient, uniform coding 2000, 2003, 2006, 2009, 2012, 2016 Core
DMONTH Discharge month 2016 Core
DQTR Discharge quarter 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
DQTR_X Discharge quarter, as received from data source 2006, 2009 Core
DRG DRG in use on discharge date 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
DRG_NoPOA DRG in use on discharge date, calculated without POA 2009, 2012, 2016 Core
DRG10 DRG, Version 10 1997 Core
DRG18 DRG, Version 18 2000, 2003 Core
DRG24 DRG, Version 24 2006, 2009, 2012 Core
DRGVER DRG or MS-DRG grouper version used on discharge date 2000, 2003, 2006, 2009, 2012, 2016 Core
DS_DX_Category1 Disease Staging: Principal Disease Category 2003, 2006, 2009 Severity
DS_LOS_Level Disease Staging: Length of Stay Level 2003, 2006 Severity
DS_LOS_Scale Disease Staging: Length of Stay Scale 2003, 2006 Severity
DS_Mrt_Level Disease Staging:Mortality Level 2003, 2006 Severity
DS_Mrt_Scale Disease Staging: Mortality Scale 2003, 2006 Severity
DS_RD_Level Disease Staging: Resource Demand Level 2003, 2006 Severity
DS_RD_Scale Disease Staging: Resource Demand Scale 2003, 2006 Severity
DS_Stage1 Disease Staging: Stage of Principal Disease Category 2003, 2006, 2009 Severity
DSHOSPID Data source hospital number 2000, 2003, 2006, 2009 Core
DXCCSn Clinical Classifications Software (CCS): ICD-9-CM diagnosis classification 2000, 2003, 2006, 2009, 2012 Core
DXMCCSn Multi-Level CCS for ICD-9-CM Diagnoses 2009,2012 DX_PR_Grps
DXn ICD-9-CM Diagnosis 1997, 2000, 2003, 2006, 2009, 2012 Core
DXVER Diagnosis codes ICD version indicator 2016 Core
DXVn Diagnosis validity flag: Diagnosis n 1997 Core
E_CCSn Clinical Classifications Software (CCS) for ICD-9-CM External Cause of Injury Code 2003, 2006, 2009, 2012 Core
E_MCCSn Multi-Level CCS for ICD-9-CM External Cause of Injury Code 2009, 2012 DX_PR_Grps
ECCSMGNn Clinical Classification Software (CCS) for Mental Health and Substance Abuse - General 2006 DX_PR_Grps
ECODEn ICD-9-CM External Cause of Injury Code 2003, 2006, 2009, 2012 Core
ELECTIVE Elective versus non-elective admission 2003, 2006, 2009, 2012, 2016 Core
FEMALE Indicator of sex 2000, 2003, 2006, 2009, 2012, 2016 Core
H_BEDSZ Bedsize of hospital (definition used prior to 1998) 1997 Hospital
H_BRTH_F Number of births in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
H_CHLD_F Number of pediatric non-births in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
H_CMPB_F Number of pediatric non-births in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
H_CONTRL Control/ownership of hospital 1997, 2009, 2012, 2016 Hospital
H_DISC_F Number of discharges in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
H_HOSP_F Number of hospitals in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
H_LOC Location of hospital (definition used prior to 1998) 1997 Hospital
H_LOCTCH Location/teaching status of hospital (definition used prior to 1998) 1997 Hospital
H_REGION Hospital census region 1997 Hospital
H_TCH Hospital teaching status (definition used prior to 1998) 1997 Hospital
H_UNCB_F Number of uncomplicated births in HCUP frame hospitals in STRATUM 1997, 2000 Hospital
HCUP_ED HCUP indicator of emergency department record 2009, 2012, 2016 Core
HFIPSSTCO Hospital FIPS State/County code 2006, 2009 Hospital
HOSP_BEDSIZE Bedsize of hospital 2000, 2003, 2006, 2009, 2012, 2016 Hospital
HOSP_CONTROL Control/ownership of hospital 2000, 2003, 2006, 2009 Hospital
HOSP_DIVISION Census Division of hospital (STRATA) 2012 Hospital
HOSP_KID KID hospital number 2012, 2016 Core, Hospital, Severity, DX_PR_Grps
HOSP_LOCATION Location (urban/rural) of hospital 2000, 2003, 2006, 2009 Hospital
HOSP_LOCTEACH Location/teaching status of hospital 2000, 2003, 2006, 2009, 2012, 2016 Hospital
HOSP_LPNFTEAPD LPN FTEs per 1000 adjusted inpatient days 2009 Hospital
HOSP_MHSCLUSTER Multi-hospital system cluster code 2009 Hospital
HOSP_MHSMEMBER Multi-hospital system membership 2009 Hospital
HOSP_NAFTEAPD Nurse aides per 1000 adjusted inpatient days 2009 Hospital
HOSP_OPSURGPCT Percentage of all surgeries performed in the outpatient setting 2009 Hospital
HOSP_REGION Region of hospital 2000, 2003, 2006, 2009, 2012, 2016 Core (beginning in 2012), Hospital
HOSP_RNFTEAPD RN FTEs per 1000 adjusted inpatient days 2009 Hospital
HOSP_RNPCT Percentage of RNs among all nurses (RNs and LPNs) 2009 Hospital
HOSP_TEACH Teaching status of hospital 2000, 2003, 2006, 2009 Hospital
HOSPADDR Hospital address from AHA Annual Survey 2000, 2003, 2006, 2009 Hospital
HOSPBRTH ICD-9-CM diagnosis indicates in-hospital birth 1997, 2000, 2003, 2006, 2009, 2012 Core
HOSPCITY Hospital city from AHA Annual Survey 2000, 2003, 2006, 2009 Hospital
HOSPID HCUP hospital identification number 2000, 2003, 2006, 2009 Core, Hospital, Severity, DX_PR_Grps
HOSPNAME Hospital name from AHA Annual Survey 2000, 2003, 2006, 2009 Hospital
HOSPNUM KID hospital number 1997 Core, Hospital
HOSPST Hospital State postal code 2000, 2003, 2006, 2009 Core, Hospital
HOSPSTCO Hospital modified FIPS state/county code 2000, 2003, 2006, 2009 Core (2000), Hospital (2003, 2006, 2009)
HOSPZIP Hospital zip code from AHA Annual Survey 2000, 2003, 2006, 2009 Hospital
I10_DXn ICD-10-CM Diagnosis 2016 Core
I10_ECAUSEn ICD-10-CM External Cause of Morbidity Code 2016 Core
I10_HOSPBRTH ICD-10-CM diagnosis indicates in-hospital birth 2016 Core
I10_NDX Number of ICD-10-CM diagnoses on this discharge 2016 Core
I10_NECAUSE Number of ICD-10-CM External Cause of Morbidity codes on this record 2016 Core
I10_NPR Number of ICD-10-PCS procedures on this discharge 2016 Core
I10_PRn ICD-10-PCS Procedure 2016 Core
I10_UNCBRTH ICD-10-CM diagnosis indicates a normal uncomplicated in-hospital birth 2016 Core
IDNUMBER Modified AHA hospital identifier 2000, 2003, 2006, 2009 Hospital
KEY Unique record identifier 2000 Core, Severity
KID_STRATUM Stratum used to post-stratify hospital 2000, 2003, 2006, 2009, 2012, 2016 Core, Hospital
LOS Length of stay, cleaned 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
LOS_X Length of stay, as received from data source 1997, 2000, 2003, 2006, 2009 Core
MDC MDC in effect on discharge date 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
MDC_NoPOA MDC in use on discharge date, calculated without POA 2009, 2012, 2016 Core
MDC10 MDC, Version 10 1997 Core
MDC18 MDC, Version 18 2000, 2003 Core
MDC24 MDC, Version 24 2006, 2009, 2012 Core
MDID_S Synthetic attending physician number 1997, 2000 Core
MDNUM1_R Physician 1 number (re-identified) 2003, 2006, 2009 Core
MDNUM2_R Physician 2 number (re-identified) 2003, 2006, 2009 Core
N_BRTH_U Number of universe births in STRATUM 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
N_DISC_U Number of discharges in the universe for the stratum 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
N_HOSP_U Number of hospitals in the universe for the stratum 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
NACHTYPE NACHRI hospital type 1997, 2000, 2003, 2006, 2009 Hospital
NCHRONIC ICD-9-CM Number of chronic conditions 2009, 2012 Core
NDX Number of ICD-9-CM diagnoses on this discharge 1997, 2000, 2003, 2006, 2009, 2012 Core
NECODE Number of ICD-9-CM External of Cause of Injury Codes on this Record 2003, 2006, 2009, 2012 Core
NEOMAT Neonatal and/or maternal ICD-9-CM DX and/or PR 1997, 2000, 2003, 2006, 2009, 2012 Core
NPR Number of ICD-9-CM procedures on this discharge 1997, 2000, 2003, 2006, 2009, 2012 Core
ORPROC Major operating room ICD-9-CM procedure indicator 2009, 2012 Core
PAY1 Expected primary payer, uniform 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
PAY1_N Expected primary payer, nonuniform 1997 Core
PAY1_X Expected primary payer, as received from data source 2000, 2003, 2006, 2009 Core
PAY2 Expected secondary payer, uniform 1997, 2000, 2003, 2006, 2009 Core
PAY2_N Expected secondary payer, nonuniform 1997 Core
PAY2_X Expected secondary payer, as received from data source 2000, 2003, 2006, 2009 Core
PCCHPRn Clinical Classifications Software: procedure classification 1997 Core
PCLASSn ICD-9-CM Procedure class 2006, 2009, 2012 DX_PR_Grps
PEDS_DISC Number of discharges, 20 years old or younger, from this hospital in the SID 2000, 2003, 2006, 2009 Hospital
PEDS_PCT Percentage of hospital discharges, 20 years old or younger 2000, 2003, 2006, 2009 Hospital
PL_NCHS Patient Location: NCHS Urban-Rural Code 2006, 2009, 2012, 2016 Core
PL_UR_CAT4 Patient Location: Urban-Rural 4 Categories 2003 Core
PointOfOrigin_X Point of origin for admission or visit, as received from source 2009 Core
PointOfOriginUB04 Point of origin for admission or visit, UB04 standard coding 2009 Core
PRn ICD-9-CM Procedure 1997, 2000, 2003, 2006, 2009, 2012 Core
PRCCSn Clinical Classifications Software (CCS) for ICD-9-CM Procedures 2000, 2003, 2006, 2009, 2012 Core
PRDAYn Number of days from admission to procedure n 2000, 2003, 2006, 2009, 2012, 2016 Core
PRMCCSn Multi-Level CCS for ICD-9-CM Procedures 2009, 2012 DX_PR_Grps
PRVn Validity Flag: Procedure n 1997 Core
PRVER Procedure codes ICD version indicator 2016 Core
RACE Race 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
RECNUM HCUP record number 1997, 2003, 2006, 2009, 2012, 2016 Core, Severity, DX_PR_Grps
S_BRTH_U Number of sample births in STRATUM 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
S_CHLD Number of pediatric non-births sampled in the hospital 1997, 2000 Hospital
S_CHLD_U Number of sample pediatric non-births in STRATUM 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
S_CMPB Number of complicated births sampled in the hospital 1997, 2000 Hospital
S_CMPB_U Number of sample complicated births in STRATUM 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
S_DISC_U Number of discharges in the sample for the stratum 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
S_HOSP_U Number of hospitals in the sample for the stratum 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
S_UNCB Number of uncomplicated births sampled in the hospital 1997, 2000 Hospital
S_UNCB_U Number of sample uncomplicated births in STRATUM 1997, 2000, 2003, 2006, 2009, 2012, 2016 Hospital
SEX Sex of the patient 1997 Core
STRATUM Stratum used to post-stratify hospital 1997 Hospital
SURGID_S Synthetic primary surgeon number 1997, 2000 Core
TOTAL_DISC Total hospital discharges 2000, 2003, 2006, 2009 Hospital
TOTCHG Total charges, cleaned 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core
TOTCHG_X Total charges, as received from data source 1997, 2000, 2003, 2006, 2009 Core
TOTDSCHG Total hospital discharges 1997 Hospital
TRAN_IN Indicator of a transfer into the hospital 2009, 2012, 2016 Core
TRAN_OUT Transfer out indicator 2012, 2016 Core
UNCBRTH ICD-9-CM diagnosis indicates a normal uncomplicated in-hospital birth 1997, 2000, 2003, 2006, 2009, 2012 Core
UNCBWT Weight to uncomplicated births in universe for estimates other than total charges 2000 Hospital
UNCBWTCHARGE Weight to uncomplicated births in universe for total charge estimates 2000 Hospital
UNCBWT_U Weight to uncomplicated births in universe 1997 Hospital
YEAR Calendar year 1997, 2000, 2003, 2006, 2009, 2012, 2016 Core, Hospital
ZIPINC Median household income for patient's ZIP Code (based on 1999 demographics) 2000 Core
ZIPINC_QRTL Median household income for patient's ZIP Code (based on current year) 2003, 2006, 2009, 2012, 2016 Core
ZIPINC4 Median income for patient's ZIP Code (4 categories) 1997 Core

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

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Internet Citation: KID 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/kid/kiddde.jsp.
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Last modified 10/12/18