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Sources of NIS Data and State-Specific Restrictions 2004

 


AR
Arkansas Department of Health & Human Services


Confidentiality of Records

  Arkansas requested that the name and address of hospitals not be released in the NIS database. The following data elements were set to missing for all Arkansas hospitals:
  • HOSPNAME, hospital name
  • HOSPCITY, hospital city
  • HOSPADDR, hospital address
  • HOSPZIP, hospital ZIP Code.

AZ
Arizona Department of Health Services


No restrictions

 


CA
Office of Statewide Health Planning & Development


Confidentiality of Records

 
  • To meet California confidentiality requirements, admission month (AMONTH), age in days, (AGEDAY), age in years (AGE), gender (FEMALE), and race (RACE), were suppressed for some records. In some cases, AGE was suppressed, but an age category was available. In these cases, we set AGE to the midpoint of the best available age category.

CO
Colorado Health & Hospital Association


No restrictions

 


CT
CHIME, Inc.


Confidentiality of Hospitals

 
    CHIME will be notified if more than 50% of their hospitals appear in any year of the NIS data.

    • Thirty-three percent (33%) of the hospitals were sampled in the 2004 NIS; there was no need to notify the data source.


    Confidentiality of Physicians

 
    CHIME does not allow the release of physician identifiers. Beginning with 2000 data, CHIME did not supply physician identifiers to HCUP.

 


FL
Florida Agency for Health Care Administration


Confidentiality of Records

 
  • Florida does not allow the release of admission month (AMONTH).
  • Florida requested that age in days at admission (AGEDAY) be set to missing in the NIS.

 


GA
GHA: An Association of Hospitals & Health Systems


Confidentiality of Hospitals

 
    To meet Georgia confidentiality requirements, hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, no hospitals needed to be dropped from the sampling frame.

    Georgia requested that hospitals not be identified in the NIS. The following data elements were set to missing for all Georgia hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Georgia hospitals.
Confidentiality of Records

 
    Georgia requested that the patientís race (RACE) be set to missing in the NIS.


Confidentiality of Physicians

 
    Georgia requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier (MDNUM1_R beginning in 2003, MDNUM1_S, from 2001 to 2002, or MDID_S, prior to 2001) and
    • Second synthetic physician identifier (MDNUM2_R beginning in 2003, MDNUM2_S, from 2001 to 2002, or SURGID_S, prior to 2001).

 


HI
Hawaii Health Information Corporation


Confidentiality of Hospitals

 
    Some Hawaii hospitals were dropped from the sampling frame to meet confidentiality requirements. Hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, 3 out of 19 hospitals needed to be dropped from the sampling frame.

    Hawaii requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Hawaii hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Hawaii hospitals.

 


IA
Iowa Hospital Association


Missing Discharges

  Beginning in data year 2001, the Iowa Hospital Association prohibits the release of two types of discharges:
    • HIV Infections (defined by MDC of 25) and
    • Behavioral Health including chemical dependency care or psychiatric care (defined by a service code of BHV).

These discharges were not included in the source file provided to HCUP and were therefore not included in the NIS.

 


IL
Illinois Department of Public Health (beginning in 2002)
Illinois Health Care Cost Containment Council (prior to 2002)


Confidentiality of Hospitals

 
    Illinois Health Care Cost Containment Council requested that no more than 40% of Illinois discharges appear in any discharge quarter of NIS data.

    • Twenty-one percent (21%) of the discharges in Illinois were sampled in the 2004 NIS. No hospitals were dropped from the sampling frame.
Confidentiality of Physicians

 
    Illinois does not allow the release of physician identifiers. Beginning with 1995 data, Illinois did not supply physician identifiers to HCUP.

 


IN
Indiana Hospital & Health Association


Confidentiality of Hospitals

 
    To meet Indiana confidentiality requirements, hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, two out of 105 hospitals needed to be dropped from the sampling frame.

    Indiana requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Indiana hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Indiana hospitals.


Confidentiality of Physicians

 
    Indiana does not allow the release of physician identifiers.

 


KS
Kansas Hospital Association


Confidentiality of Hospitals

 
    Kansas requested that hospitals not be identified in the NIS. The following data elements were set to missing for all Kansas hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

 


KY
Kentucky Department for Public Health


No restrictions

 


MA
Division of Health Care Finance and Policy


Confidentiality of Records

 
    Massachusetts requested that age in days at admission (AGEDAY) be set to missing in the NIS.
Confidentiality of Physicians

 
    Massachusetts requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier (MDNUM1_R beginning in 2003, MDNUM1_S, from 2001 to 2002, or MDID_S, prior to 2001) and
    • Second synthetic physician identifier (MDNUM2_R beginning in 2003, MDNUM2_S, from 2001 to 2002, or SURGID_S, prior to 2001).

 


MD
Health Services Cost Review Commission


No restrictions

 


MI
Michigan Health & Hospital Association


Confidentiality of Hospitals

 
    Some Michigan hospitals were dropped from the sampling frame for two reasons:

    • To meet Michigan confidentiality requirements, hospitals were to be dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum. In the 2003 NIS, no hospitals needed to be dropped from the sampling frame.


    • 33 out of 132 hospitals were dropped from the sampling frame because they did not report total charges. These hospitals were fairly evenly distributed by hospital type. There were no sampling strata in the state containing only hospitals without total charges.

    Michigan requested that hospitals not be identified in the NIS database. The following data elements are set to missing for all Michigan hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bedsize of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Michigan hospitals.

 


MN
Minnesota Hospital Association


No restrictions

 


MO
Hospital Industry Data Institute


No restrictions

 


NC
North Carolina Department of Health and Human Services


Confidentiality of Physicians

 
    North Carolina requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier, MDNUM1_S, from 2001 to 2002, and MDNUM1_R, beginning in 2003
    • Second synthetic physician identifier, MDNUM2_S, from 2001 to 2002, and MDNUM2_R, beginning in 2003.

 


NE
Nebraska Hospital Association


Confidentiality of Hospitals

 
    Some Nebraska hospitals were dropped from the sampling frame for two reasons:

    • To meet Nebraska confidentiality requirements, hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum. In the 2004 NIS, none out of 83 hospitals needed to be dropped from the sampling frame.


    • Two out of 83 hospitals were dropped from the sampling frame because they had incomplete data and were missing a high percentage of Medicare Discharges.

    Nebraska requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Nebraska hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Nebraska hospitals.
Missing Discharges

 
    The Nebraska Hospital Association prohibits the release of discharge records for patients with HIV diagnoses. These discharges were not included in the source file provided to HCUP and were therefore not included in the NIS.

 


NH
New Hampshire Department of Health & Human Services


Confidentiality of Records

 
    New Hampshire requested that age in days at admission (AGEDAY) be set to missing in the NIS.

 


NJ
New Jersey Department of Health & Senior Services


No restrictions

 


NV
Nevada Department of Human Resources


No restrictions

 


NY
York State Department of Health


No restrictions

 


OH
Ohio Hospital Association


Confidentiality of Hospitals

 
    To meet Ohio confidentiality requirements, hospitals were to be dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, no hospitals needed to be dropped from the sampling frame.

    In addition, three hospitals were dropped from the sampling frame to meet additional Ohio confidentiality requirements.

    Ohio requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Ohio hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Ohio hospitals.
Confidentiality of Physicians

 
    Ohio does not allow the release of physician identifiers.

 


OR
Oregon Association of Hospitals & Health Systems


No restrictions

 


RI
Rhode Island Department of Health


No restrictions

 


SC
South Carolina State Budget & Control Board


Confidentiality of Hospitals

 
    Some South Carolina hospitals were dropped from the sampling frame to meet confidentiality requirements. Hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, five out of 56 hospitals needed to be dropped from the sampling frame in order to protect the confidentiality of the hospitals.

    South Carolina requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all South Carolina hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of South Carolina hospitals.
Confidentiality of Records

 
    South Carolina requested that age in days at admission (AGEDAY) be set to missing in the NIS.

 


SD
South Dakota Association of Healthcare Organizations


Confidentiality of Hospitals

 
    Some South Dakota hospitals were dropped from the sampling frame to meet confidentiality requirements. Hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.

    • In the 2004 NIS, three out of 48 hospitals needed to be dropped from the sampling frame in order to protect the confidentiality of the hospitals.

    South Dakota requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all South Dakota hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bed size of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of South Dakota hospitals.

 


TN
Tennessee Hospital Association


Confidentiality of Hospitals

 
    Some Tennessee hospitals were dropped from the sampling frame to meet confidentiality requirements. Hospitals were dropped from the sampling frame whenever there were fewer than two hospitals in a sampling stratum.


    • In the 2004 NIS, no hospitals needed to be dropped from the sampling frame in order to protect the confidentiality of the hospitals.


    Tennessee requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Tennessee hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    In order to further ensure the confidentiality of hospitals, stratifier data elements were set to missing if the cell, as defined by

    • HOSP_CONTROL, control/ownership of hospital
    • HOSP_LOCATION, location (urban/rural) of hospital
    • HOSP_TEACH, teaching status of hospital
    • HOSP_BEDSIZE, bedsize of hospital
    • HOSP_LOCTEACH, location/teaching status of hospital

    had fewer than two hospitals in the universe of Tennessee hospitals

 


TX
Texas Department of State Health Services (2004)
Texas Health Care Information Council (prior to 2004)


Confidentiality of Hospitals

 
    Texas requested that hospitals not be identified in the NIS database. The following data elements were set to missing for all Texas hospitals:

    • DSHOSPID, data source hospital identifier
    • HOSPSTCO, hospital state, modified county FIPS code
    • HFIPSSTCO, hospital state, unmodified county FIPS code
    • IDNUMBER, AHA hospital identifier without leading 6
    • AHAID, AHA hospital identifier with leading 6
    • HOSPNAME, hospital name
    • HOSPCITY, hospital city
    • HOSPADDR, hospital address
    • HOSPZIP, hospital ZIP Code.

    Confidentiality of Records

 
    • Texas requested that age in days at admission (AGEDAY) be set to missing in the NIS.


    • Texas requested that age in years (AGE) be set to the midpoints of age ranges defined by THCIC. There were 22 age groups for the general patient population and 5 age groups for the HIV or alcohol/drug use patients. The age groups are shown below:

Texas Restriction on AGE for General Patient Population other than HIV or Drug/Alcohol Use Patients
Age Range New value of AGE
0 0
1-4 2
5-9 7
10-14 12
15-17 16
18-19 19
20-24 22
25-29 27
30-34 32
35-39 37
40-44 42
45-49 47
50-54 52
55-59 57
60-64 62
65-69 67
70-74 72
75-79 77
80-84 82
85-89 87
90 and above 90

Texas Restriction on AGE for HIV or Drug/Alcohol Use Patients
Age Range New value of AGE
0 0
1-17 8
18-44 31
45-64 54
65-74 69
75 and above 75
The HIV or drug/alcohol use patients are identified by any principal or secondary diagnosis code on the record having the first four characters equal to one of the values in the following list: ‘2910’, ‘2911’, ‘2912’, ‘2913’, ‘2914’, ‘2915’, ‘2918’, ‘2919’, ‘2920’, ‘2921’, ‘2922’, ‘2928’, ‘2929’, ‘3030’, ‘3039’, ‘3040’, ‘3041’, ‘3042’, ‘3043’, ‘3044’, ‘3045’, ‘3046’, ‘3047’, ‘3048’,‘3049’, ‘3050’, ‘3052’, ‘3053’, ‘3054’, ‘3055’, ‘3056’, ‘3057’, ‘3058’, ‘3059’, ‘7903’, ‘V08 ’, and ‘042 ’.

 


UT
Utah Department of Health


Confidentiality of Physicians

 
    Utah requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier (MDNUM1_R, beginning in 2003, MDNUM1_S, from 2001 to 2002, or MDID_S, prior to 2001) and
    • Second synthetic physician identifier (MDNUM1_R, beginning in 2003, MDNUM2_S, from 2001 to 2002, or SURGID_S, prior to 2001).

 


VA
Virginia Health Information


Confidentiality of Hospitals

 
    The Nationwide Inpatient Sample may not include more than 50% of the hospitals in Virginia.

    • Twenty-three percent (23%) of the hospitals in Virginia were sampled for the 2004 NIS.

 


VT
Vermont Association of Hospitals and Health Systems


Confidentiality of Physicians

 
    Vermont requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier: MDNUM1_R, beginning in 2003, and MDNUM1_S, from 2001 to 2002, and
    • Second synthetic physician identifier: MDNUM2_R, beginning in 2003, and MDNUM2_S, from 2001 to 2002.

 


WA
Washington State Department of Health


No restrictions

 


WI
Wisconsin Department of Health & Family Services


No restrictions

 


WV
West Virginia Health Care Authority


Confidentiality of Physicians

 
    Beginning in 2004, West Virginia requested that the following data elements be set to missing in the NIS:

    • First synthetic physician identifier: MDNUM1_R
    • Second synthetic physician identifier: MDNUM2_R.

 


Internet Citation: 2004 NIS Data and State-Specific Restrictions. Healthcare Cost and Utilization Project (HCUP). September 2006. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/nation/nis/nis_2004_stspecific_restr.jsp.
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Last modified 9/12/06