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United States Nationwide Inpatient Sample 1989


General Info
Original or alternative title 
HCUP Nationwide Inpatient Sample Release 1
Coverage type 
Time period covered 
01/1989 - 12/1989
Series or system 
United States Nationwide Inpatient Sample
Data type
Administrative data:
  • Discharge
  • Inpatient
  • Nationally representative

The Nationwide Inpatient Sample (NIS) is a database of hospital inpatient stays. It was developed by the Healthcare Cost and Utilization Project (HCUP), and is meant to approximate a 20% sample of United States community hospitals. Variables include patient demographics, diagnosis and procedure codes, admission and discharge status, length of stay, expected payer, total charges, and hospital characteristics.

The 1989 NIS data belong to NIS Release 1, which spans the years 1988-1992. When the NIS began in 1988, eight states were included. As of 2011, data from 46 states were included in the NIS. The 1989 dataset includes information on all inpatient stays from over 800 hospitals, totaling approximately 6.1 million records.