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  1. hcup-us.ahrq.gov/db/vars/ndx/nedsnote.jsp
    May 01, 2015 - NDX indicates the total number of ICD-9-CM diagnoses (valid and invalid) coded on the discharge record … Value Description 0 No diagnoses are coded on the record 1 Only the first listed … In Q1 2008, about 93,000 records have only 1 diagnosis in these 11 hospitals. … In quarter two through four of 2008, about 48,000 records per quarter have only 1 diagnosis reported … We therefore estimate that about 45,000 records are missing secondary diagnoses in the 11 hospitals.
  2. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2019.pdf
    January 01, 2019 - “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. … Records that were part of transfers or same-day stays were collapsed into a single combined record. … Creating a Combined Transfer Record Combining information across transfer and same-day stay records
  3. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2018.pdf
    January 01, 2018 - “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. … Records that were part of transfers or same-day stays were collapsed into a single combined record. … Creating a Combined Transfer Record Combining information across transfer and same-day stay records
  4. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2018.jsp
    January 01, 2018 - "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. … Records that were part of transfers or same-day stays were collapsed into a single combined record. … Creating a Combined Transfer Record Combining information across transfer and same-day stay records
  5. hcup-us.ahrq.gov/db/nation/nis/nis_2004_stspecific_restr.jsp
    January 01, 2004 - age in days, (AGEDAY), age in years (AGE), sex (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
  6. hcup-us.ahrq.gov/db/state/siddist/siddist_filecompri.jsp
    August 01, 2006 - The overall number of discharge records is similar to previous years as well as the inpatient … Each record contains an inpatient segment, an observation stay (OS) segment, a summary segment, … Exclusion of Records During HCUP Data Processing Records with a discharge disposition of "still
  7. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2013.pdf
    January 01, 2013 - “combined” record in the NRD and removed the original separate discharge records from the NRD. … In addition, pairs of discharge records representing transfers (i.e., one discharge record from the … “combined” record in the NRD and removed the original separate discharge records from the NRD. … We collapsed records that were part of transfers and same-day stays into a single combined record. … Creating a Combined Transfer Record Combining information across transfer and same-day stay records
  8. hcup-us.ahrq.gov/db/vars/dqtr_x/nisnote.jsp
    September 01, 2008 - sampled one fourth of the Massachusetts NIS discharges from the first three quarters and modified the records … diagnosis group for the principal diagnosis, sex, age, and a random number before selecting every fourth record … The following describes the adjustments made to the selected Massachusetts NIS records: We relabeled … We then adjusted the discharge weights for the Massachusetts records to appropriately account for the
  9. MAINTAIN AND EXPAND (pdf file)

    hcup-us.ahrq.gov/reports/methods/2011_01.pdf
    January 01, 2011 - These are defined by multiple records in which the discharge date of one hospital record is the same … separate records. … Reasons to Collapse Same-Day Hospital Records into One Combined Record If the multiple same-day event … records are combined into a summary record, then a study of revisits will consider the care received … into One Combined Record Reasons to Retain Same-Day Hospital Events as Separate Records Categorizing
  10. hcup-us.ahrq.gov/datainnovations/raceethnicitytoolkit/or28.pdf
    November 15, 2011 - urban Indian health center in Seattle Tribe-specific data obtained for special projects • Results of record … linkages used to close the data gap Record linkage approach Northwest Portland Area Indian Health … Conduct probabilistic record linkages between the NTR and health-related datasets in ID, OR, and WA … race data reported back to state De-identified data for analysis Hosp. discharge Cancer Death records … , 55% misclassified or unknown race • Oregon acute & communicable disease registry 40% of AI/AN records
  11. hcup-us.ahrq.gov/reports/race/50StateScan04_26forweb.pdf
    December 01, 2010 - Tobacco Use Health Status Not specified Arizona Department of Health Services Not specified Vital Records … Health, Physical Activity, Tobacco Use Both Not specified AR DOH Not specified Census, BRFSS, Vital Records … Fetal Occupational Injuries, Current Population Survey), DPH Infectious Diseases Section, Vital Records … , Death Records, BRFSS, ED/ER Geographic (County) African American (in one data book), Hispanic … NJ DHSS State BRFSS, Vital Records, ED/ER, Other Geographic (State) White, Black, Hispanic, Asian
  12. hcup-us.ahrq.gov/db/nation/nass/nasscorrections_2022.jsp
    January 01, 2022 - over- or under-represented in the 2022 Nationwide Ambulatory Surgery Sample (NASS) due to about 3,000 records … The impact of omitting these records from the NASS’s 9,097,088 sampled encounters will vary by ambulatory
  13. hcup-us.ahrq.gov/db/nation/neds/nedscorrections_2022.jsp
    January 01, 2022 - under-represented in the 2022 HCUP Nationwide Emergency Department Sample (NEDS) due to about 8,900 records … The impact of omitting these records from the NEDS sample may cause some instability in trends and/or
  14. hcup-us.ahrq.gov/db/state/siddist/siddist_filecompnd.jsp
    August 01, 2025 - Exclusion of Records During HCUP Data Processing Records with a discharge disposition of "still
  15. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2015.pdf
    January 01, 2015 - “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
  16. hcup-us.ahrq.gov/db/nation/nis/NIS_Sources_and_Restrictions_2001.pdf
    January 01, 2001 - FL Florida Agency for Health Care Administration Confidentiality of Records • Florida does … Confidentiality of Records Georgia requested that the patient’s race (RACE) be set to missing in … Missing Discharges The Nebraska Hospital Association prohibits the release of discharge records … Pennsylvania requested that patient age (AGE) be set to the midpoint of 5-year intervals for records … HIV or drug/alcohol use patients are identified by any principal or secondary diagnosis code on the record
  17. hcup-us.ahrq.gov/db/nation/neds/NEDS_Introduction_2019.jsp
    January 01, 2019 - 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
  18. hcup-us.ahrq.gov/db/vars/prdayn/nisnote.jsp
    September 01, 2008 - These records failed the appropriate edit check. … As a rule in HCUP processing, records that contain procedure days not during the stay are flagged by … Records that contain procedure days not during the stay are flagged by an edit check and the procedure … Also in 1995, a data processing error in the source data resulted in a number of records with procedure … These records are flagged by an edit check during HCUP processing.
  19. hcup-us.ahrq.gov/db/vars/prdayn/kidnote.jsp
    September 01, 2008 - These records failed the appropriate edit check. … As a rule in HCUP processing, records that contain procedure days not during the stay are flagged by … Records that contain procedure days not during the stay are flagged by an edit check and the procedure … Also in 1995, a data processing error in the source data resulted in a number of records with procedure … These records are flagged by an edit check during HCUP processing.
  20. hcup-us.ahrq.gov/db/nation/nrd/Introduction_NRD_2010-2016.pdf
    January 01, 2016 - “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

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