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United States Nationwide Inpatient Sample 2001

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General Info
Original or alternative title 
HCUP Nationwide Inpatient Sample 2001
Geography 
Coverage type 
Country
Time period covered 
01/2001 - 12/2001
Series or system 
United States Nationwide Inpatient Sample
Data type
Administrative data:
  • Discharge
  • Inpatient
  • Nationally representative
Summary 

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 2001 NIS release includes data from 33 states. When the NIS began in 1988, eight states were included. As of 2011, data from 46 states were included in the NIS. The 2001 release includes information on all inpatient stays from close to 1,000 hospitals, totaling approximately 7.5 million records.