SID Notes

Source Files

The HCUP Iowa inpatient files were constructed from the Statewide Database provided by the Iowa Hospital Association (IHA).

Beginning July 1, 2016, previous restrictions on the exclusion of records for (1) behavioral health patients treated in chemical dependency or psychiatric care units of the hospital and (2) patients with HIV infections changed allowing IHA to release this data. However, these records are not included in the data until data year 2017.

Prior to July 1, 2016, IHA was prohibited from releasing these two types of discharge records. These discharges were not included in the source file provided to HCUP and were therefore not included in the HCUP files. Behavioral health patients treated in chemical dependency or psychiatric care units were defined by IHA as having HospitalUnit = 4. The identification of HIV patients changed over time.

From 2001-2012, records for patients with HIV infections were defined by:

  • A Major Diagnostic Category [MDC] of 25
Beginning in data year 2013 through September 2015, the Iowa Hospital Association prohibited the release of the following ICD-9-CM diagnosis codes:
  • 042 = Human Immunodeficiency Virus (HIV) Disease
  • V08 = Asymptomatic HIV infection status if the results are positive but the patient is asymptomatic
  • V6544 = Human Immunodeficiency Virus (HIV) Counseling
  • 07953 = Human Immunodeficiency Virus (HIV), type 2 [HIV-2]
  • 79571 = Nonspecific Serologic Evidence of Human Immunodeficiency Virus (HIV)
Beginning in October 2015, the Iowa Hospital Association prohibited the release of the following ICD-10-CM diagnosis codes:
  • B20 = Human Immunodeficiency Virus (HIV) Disease
  • Z21 = Asymptomatic HIV infection status if the results are positive but the patient is asymptomatic
  • Z717 = Human Immunodeficiency Virus (HIV) Counseling
  • B9735 = Human Immunodeficiency Virus (HIV) , type 2 [HIV-2]
  • R75 = Nonspecific Serologic Evidence of Human Immunodeficiency Virus (HIV)


Types of Facilities Included in the Files Provided to HCUP by the Partner

Iowa supplied discharge data and some uniform bills for acute inpatient discharges from member hospitals.

A comparison of the number of hospitals included in the SID and the number of hospitals reported in the AHA Annual Survey is available starting in data year 2010.

Hospitals do not always report data for a full calendar year. Some hospitals open or close during the year; other hospitals have technical problems that prevent them from reporting data for all months in a year.

Inclusion of Stays in Special Units

Beginning in 2001, the documentation supplied by the IHA indicates that the data include stays in acute exempt units, rehabilitation, and alternate level of care (skilled nursing facilities and swing bed facilities) in the source files. These records can be identified with the HCUP variable HOSPITALUNIT.

Prior to 2001, the data included stays in acute exempt units, but excluded stays in swing bed and long term care units.

Exclusion of Records During HCUP Data Processing

For the 2011 data year only, MDC and diagnosis-related group (DRG) were set to missing for skilled nursing care/skilled swing bed records (defined by HospitalUnit=3).

Records with a discharge disposition of "still a patient" and "admitted as an inpatient to this hospital" were excluded from the HCUP Iowa inpatient data.


Internet Citation: HCUP Central Distributor SID Iowa File Composition. Healthcare Cost and Utilization Project (HCUP). August 2006. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/state/siddist/siddist_filecompia.jsp.
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Last modified 8/11/06