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  1. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2017.pdf
    January 01, 2017 - “combined” record in the NRD and removed the original separate discharge records from the NRD. … ” record. … “combined” record in the NRD and removed the original separate discharge records from the NRD. … We collapsed records that were part of transfers or same-day stays into a single combined record. … Creating a Combined Transfer Record Combining information across transfer and same-day stay records
  2. hcup-us.ahrq.gov/db/state/siddbdocumentation.jsp
    September 01, 2025 - The State Inpatient Databases (SID) are State-specific files that contain all inpatient care records
  3. hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2018.jsp
    January 01, 2018 - on the record. … The HCUP criterion for identifying an ED record (i.e., a discharge record for a patient with an ED visit … The NEDS contains encounter -level records, not patient -level records. … , record length, and record layout Nationwide SAS Load Programs Nationwide SPSS Load Programs … Record identifier, synthetic KEY_ED Unique HCUP NEDS record number - links to NEDS Supplemental Files
  4. hcup-us.ahrq.gov/db/state/siddist/siddist_filecompde.jsp
    June 01, 2024 - Exclusion of Records During HCUP Data Processing Records with a discharge disposition of "still a
  5. hcup-us.ahrq.gov/nassoverview.jsp
    July 01, 2025 - The NASS is limited to encounters with at least one in-scope major ambulatory surgery on the record, … The Supplemental File contains entries for out-of-scope procedures (approximately 6.9 million records … This file includes less records than the Encounter File because not all encounters included both in-scope … If an encounter had no not-in-scope procedures, then there is no record in the Supplemental File. … contains clinical and resource-use information that is included in a typical hospital-owned facility record
  6. hcup-us.ahrq.gov/db/nation/nis/tools/stats/SummaryStats_NIS_2004_Quality_Report.PDF
    January 01, 2004 - NIS 2004 06:14 Tuesday, July 11, 2006 1 Data Quality Report Edit Category Edit Check Percent of Records … (2004) Number of Records (2004) EANY : Failed at least one edit check 8.65 692,475 Age EAGE … < 0) 0.00 96 EAGE03 : Age in years > than 124 0.00 131 EAGE04 : Age in years > 0 and neonatal record … 0.01 851 EAGE05 : Age in years < 10 or > 55 and maternal record 0.00 131 Length of Stay ELOS … Diagnoses/Procedures EDXPR : Any DXPR edit 0.45 35,638 EDXPR01 : Mixed neonatal and maternal record
  7. hcup-us.ahrq.gov/db/nation/nis/tools/stats/SummaryStats_NIS_2003_Quality_Report.PDF
    January 01, 2003 - NIS 2003 12:13 Wednesday, June 1, 2005 1 Data Quality Report Edit Category Edit Check Percent of Records … (2003) Number of Records (2003) EANY : Failed at least one edit check 8.33 664,746 Age EAGE … AGE < 0) 0.00 36 EAGE03 : Age in years > than 124 0.00 1 EAGE04 : Age in years > 0 and neonatal record … 0.00 393 EAGE05 : Age in years < 10 or > 55 and maternal record 0.00 72 Length of Stay ELOS … 0.08 6,325 EDX01 : Missing principal diagnosis 0.03 2,190 EDX02 : Invalid diagnosis code on record
  8. hcup-us.ahrq.gov/db/nation/nis/nis_2005_stspecific_restr.jsp
    January 01, 2005 - age in days, (AGEDAY), age in years (AGE)sexer (FEMALE), and race (RACE), were suppressed for some records … FL Florida Agency for Health Care Administration Confidentiality of Records   … Confidentiality of Records   Georgia requested that the patient�s race … NH New Hampshire Department of Health & Human Services Confidentiality of Records … HIV or drug/alcohol use patients are identified by any principal or secondary diagnosis code on the record
  9. hcup-us.ahrq.gov/nedsoverview.jsp
    July 01, 2025 - Beginning in the 2022 NEDS, EDs with no records representing admissions directly from the ED to the same … EDs included in the NEDS sampling frame were required to have two types of ED records reported in the … The unique NEDS record identifier (KEY_ED) provides the linkage between the NEDS Core File and the Supplemental … the inpatient stay, such as total charges, length of inpatient stay, and procedure codes from the SID record … The unique NEDS record identifier (KEY_ED) provides the linkage between the NEDS Core File and the Supplemental
  10. hcup-us.ahrq.gov/db/vars/los_x/nisnote.jsp
    September 01, 2008 - New Mexico The original New Mexico inpatient file contained outpatient records from HOSPID=35020. … During the creation on the 2011 Mew Mexico SID these outpatient records, identified by a length of stay … Because New York masked the dates on AIDS/HIV* records, the calculated length of stay was missing. … Beginning with the 2005 New York identifies AIDS/HIV records by ICD-9-CM diagnosis code or DRG: An … *For 1998- 2004 data, New York identifies AIDS/HIV records by ICD-9-CM diagnosis code or DRG: An
  11. hcup-us.ahrq.gov/db/vars/los_x/kidnote.jsp
    September 01, 2008 - New Mexico The original New Mexico inpatient file contained outpatient records from HOSPID=35020. … During the creation on the 2011 Mew Mexico SID these outpatient records, identified by a length of stay … Because New York masked the dates on AIDS/HIV* records, the calculated length of stay was missing. … Beginning with the 2005 New York identifies AIDS/HIV records by ICD-9-CM diagnosis code or DRG: An … *For 1998- 2004 data, New York identifies AIDS/HIV records by ICD-9-CM diagnosis code or DRG: An
  12. Title: (pdf file)

    hcup-us.ahrq.gov/datainnovations/NJAbstractFinal.pdf
    September 29, 2013 - research (CER) that bridges prehospital and hospital care using newly available electronic patient care records … The aims of this study are as follows: • Newly available electronic patient care records for pre-hospital
  13. hcup-us.ahrq.gov/db/vars/ageday/nisnote.jsp
    September 01, 2008 - The day of birth was set to 15 for all records. … Iowa AGEDAY may be incorrectly set to invalid (.A) on newborn records. … New York identifies AIDS/HIV records by ICD-9-CM diagnosis code, DRG, or MS-DRG: An admitting, principal … A day of "01" was imputed for all records. … During HCUP processing AGE was set to 0 for records with a valid value for age in days (AGEDAY).
  14. Nrd2014 (pdf file)

    hcup-us.ahrq.gov/db/nation/nrd/NRD2014.pdf
    December 25, 2022 - Procedure Day Longer than the Length of Stay In the 2014 NRD, there are 354 records in which one of … Procedures performed prior to the admission may be bundled into the record because they are related
  15. hcup-us.ahrq.gov/team/StateDUA.pdf
    May 31, 2025 - of individual identification of persons is increased when observations (i.e., individual discharge records … will not release or disclose information where the number of observations (i.e., individual discharge records … · I will not attempt to link, and will prohibit others from attempting to link, the discharge records … of persons in the data set with individually identifiable records from any other source … Agreementsand proof of online training must be submitted to the HCUP Central Distributor for AHRQ’s records
  16. Slide 1 (pdf file)

    hcup-us.ahrq.gov/datainnovations/ICD10Imp_Romano_NAHDO_October2016.pdf
    October 27, 2016 - from 8 hospitals – Sampling characteristics uncertain – 88% of records from 4 hospitals – April-October … 2013 • University of California Davis Medical Center – 5,167 dual coded records from 1 urban academic … OR Procedures • “Major operating room procedures” drive assignment of Surgical MS-DRGs • 35% of records … in dual coded data using ICD-9- CM codes • 40% of records in dual coded data using ICD- 10-CM/PCS codes … • A significant increase in the number/percent of records considered “surgical” based on MS- DRGs…
  17. hcup-us.ahrq.gov/db/nation/nis/NIS_Sources_and_Restrictions_2002.pdf
    January 01, 2002 - Restrictions 2002 FL Florida Agency for Health Care Administration Confidentiality of Records … Restrictions Sources of NIS Data and State-Specific Restrictions 2002 Confidentiality of Records … Missing Discharges The Nebraska Hospital Association prohibits the release of discharge records … Confidentiality of Records South Carolina requested that age in days at admission (AGEDAY) be set … HIV or drug/alcohol use patients are identified by any principal or secondary diagnosis code on the record
  18. hcup-us.ahrq.gov/team/NationwideDUA.pdf
    May 31, 2025 - of individual identification of persons is increased when observations (i.e., individual discharge records … the release or disclosure of information where the number of observations (i.e., individual discharge records … · I will not attempt to link, and will prohibit others from attempting to link, the discharge records … of persons in the data set with individually identifiable records from any other source … Agreements and proof of online training must be submitted to the HCUP Central Distributor for AHRQ’s records
  19. hcup-us.ahrq.gov/datainnovations/clinicaldata/RealTimeLOINCTranslationPoster.pdf
    July 01, 2009 - Contact information Health information exchange requires interfacing with diverse electronic medical record … reporting hospital measures and in research repositories. 2 One barrier to the integration of medical records … application that will extract the data pre-coordinated for transmission in HL7 and standardize the records … • LOINC® codes are available for lab results (OBX records) and lab orders (OBR records). … || P|| 19990831113000 ^^ RT~|| OBX3 field holds LOINC code; may have multiple OBX rows in one HL7 record
  20. hcup-us.ahrq.gov/datainnovations/raceethnicitytoolkit/or18.pdf
    February 01, 2012 - Access (IDEA-NW) Project Northwest Tribal Epidemiology Center Link Plus is a free probabilistic record … 2012 Setting up & running the linkage  File 1 and File 2 have a one-to-many relationship: each record … in File 1 can match 0 to many records in File 2. … Some real-life examples: o 200,000 records matched to 10,000 recs: < 2 min. … Clerical Review  If the clerical review screen appears to have no matching fields within record pairs

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