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Healthcare Costs and Utilization Project:
Nationwide Inpatient Sample (NIS) Release 6
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| Study Number |
U05_97 |
| Background of Dataset |
| Purpose of the Data Set |
The Nationwide Inpatient Sample (NIS) is a database
of hospital inpatient stays. NIS files can be used to identify,
track, and analyze national trends in health care utilization,
access, charges, quality, and outcomes. |
| Criteria(s) for Inclusion/Exclusion |
Includes these states: AZ, CA, CO, CT,
FL, GA, HI, IL, IA, KS, MD, MA, MO, NJ, NY, OR, PA, SC, TN, UT,
WA, WI |
| Age Range Included |
All. |
| Method(s) of Data Gathering |
Information comes from inpatient stay records including
clinical and resource use, typically available from discharge
abstracts. |
| Sampling Frame/Design |
Stratified probability sample of hospitals. |
| Limitation(s) of Study |
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Year(s) Available
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1988-1997. |
| Number of Observations |
7,148,420 patients in 1,012 hospitals in 1997. |
| Unit of Observation |
Hospital Inpatient stay. |
| Publisher |
Department of Human Services, U.S. Public Health
Service, Agency of Healthcare Research and Quality |
| Contact Information/Web Address |
http://www.ahrq.gov/data/hcup/hcupnis.htm |
| Condition of Use |
Users must sign data use agreement. |
| Contents of Database |
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Key Linking Variables
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•Patient identifier
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•Physician identifier
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•Health facility identifier
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•Geographic identifier
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•Other identifier
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| Demographics Information |
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•Sex
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Yes. |
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•Race
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Yes. |
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•Geographic location
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Yes, by state. |
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•Income
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Yes, by zipcode. |
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•Education
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•Employment status
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•Others
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| Access/Utilization Information |
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| Unit of Utilization |
Hospital admission. |
| Source of Information |
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•Self reported
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•Parent
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•Medical provider
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Yes. |
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•Billing/encounters
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•Other source
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| Health Insurance Information |
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•Insurance status
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•Insurance type
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•Other information
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Expected payer. |
| Health Care Utilization |
Yes. |
| >Type |
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1) Outpatient
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N/A |
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2) Inpatient
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Yes. |
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•Admission/discharge dates
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Yes. |
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•Number of admissions
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Yes. |
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•Length of stay
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Yes. |
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•Admission status (transfer, ER admissions...etc)
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Yes. |
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•Discharge status
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Yes. |
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•Other information
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Admission source. |
| >Medical Codes |
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•CPT codes
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•ICD-9 codes
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Yes. |
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•DRG codes
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Yes. |
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•Other codes
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MDC. |
| Health Care Facility Information |
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•Location
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Yes, county and zip for some states. |
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•Number of beds
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•Number of MDs
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•Other information
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Hospital ID provided by data source. |
| Physician Information |
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•Specialty
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•Name
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•License Number
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•Other information
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Encrypted ID. |
| Cost/Expenditure Information |
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•Unit of cost
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Inpatient stay. |
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•Charges/costs/payments
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Yes. |
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•Total
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Yes. |
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•Allied and additional services
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•Pharmacy
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•Out-of-pocket payments
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•Other information
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| Other Information |
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| • |
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