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Table 3. Data Elements in the NIS Inpatient Core Files, 1998Note: The 1998 NIS differs from previous NIS releases; some data elements were dropped,some added, and for some data elements the values were changed.Data elementDescription (numbers in brackets indicate variable coding)AGEAGEDAYAMONTHASOURCEASOURCE_XATYPEAWEEKENDDIEDDISCWTDISCWT10DISPUB92DISPUniformDQTRDRGAge in years at admissionAge in days (coded only when the age in years is less than 1) at admissionAdmission monthAdmission source: (1) ER, (2) another hospital, (3) another facility including longtermcare, (4) court/law enforcement, (5) routine/birth/otherAdmission source, as received from data source*Admission type: (1) emergency, (2) urgent, (3) elective, (4) newborn, (6) otherAdmission on weekend: (0) admission on Monday-Friday, (1) admission onSaturday-SundayIndicates in-hospital death: (0) did not die during hospitalization, (1) died duringhospitalizationDischarge weight (on Core file and Hospital Weights file)Discharge weight (on 10% subsample file)Disposition of patient (discharge status), UB92 coding: (1) routine, (2) short termhospital, (3) skilled nursing facility, (4) intermediate care, (5) another type offacility, (6) home health care, (7) against medical advice, (8) home IV provider,(20) died in hospital, (40) died at home, (41) died in a medical facility, (42) died,place unknown, (50) Hospice, home, (51) Hospice, medical facilityDisposition of patient (discharge status), uniform coding: (1) routine, (2) transferto short term hospital, (3) other transfers, including skilled nursing facility,intermediate care, and another type of facility, (6) home health care, (7) againstmedical advice, (20) died in hospitalDischarge quarterDiagnosis Related Group (DRG) in use on discharge dateDRG10 DRG Version 10 (effective October 1992 - November 1993)DRG18 DRG Version 18 (effective October 2000 - November 2001)DRGVERDSHOSPIDDX1-DX15DXCCS1-DXCCS15FEMALEHOSPIDHOSPSTGrouper version in use on discharge dateHospital number as received from the data sourcePrincipal and secondary diagnosesClinical Classifications Software (CCS) category for all diagnosesGender of patient: (0) male, (1) femaleHCUP hospital number (links to Hospital Weights file)State postal code for hospital (e.g., AZ for Arizona)8
Table 3. Data Elements in the NIS Inpatient Core Files, 1998 (Continued)Data elementHOSPSTCOKEYLOSLOS_XMDCDescription (numbers in brackets indicate variable coding)Modified Federal Information Processing Standards (FIPS) State/county code forhospital, links to Area Resource File (available from the Bureau of HealthProfessions, Health Resources and Services Administration)Unique record numberLength of stay, editedLength of stay, as received from data sourceMajor Diagnosis Category (MDC) in use on discharge dateMDC10 MDC Version 10 (October 1992 - November 1993)MDC18 MDC Version 18 (effective October 2000 - November 2001)MDID_SNDXNEOMATNPRPAY1PAY1_XPAY2PAY2_XPR1-PR15PRCCS1-PRCCS15PRDAY1-PRDAY15Synthetic attending physician numberNumber of diagnoses coded on the original recordNeonatal/maternal flag: (0) not maternal or neonatal, (1) maternal diagnosis orprocedure, (2) neonatal diagnosis, (3) maternal and neonatal on same recordNumber of procedures coded on the original recordExpected primary payer, uniform: (1) Medicare, (2) Medicaid, (3) private includingHMO, (4) self-pay, (5) no charge, (6) otherExpected primary payer, as received from the data source*Expected secondary payer, uniform: (1) Medicare, (2) Medicaid, (3) privateincluding HMO, (4) self-pay, (5) no charge, (6) otherExpected secondary payer, as received from the data source*Principal and secondary proceduresClinical Classifications Software (CCS) for all proceduresFor each procedure, the number of days from admissionRACE Race includes (1) white, (2) black, (3) Hispanic, (4) Asian or Pacific Islander, (5)Native American, (6) otherSURGID_STOTCHGTOTCHG_XYEARSynthetic primary surgeon numberTotal charges, editedTotal charges, as received from data sourceCalendar yearZIPINC Median income for patient’s ZIP Code: (1) $1-$24,999, (2) $25,000-$34,999, (3)$35,000-$44,999, (4) $45,000 and above*For categorical data elements with _X suffix, see Description of Data Elements (on the NIS DocumentationCD-ROM) for state-specific coding.9
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