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NIS Description of Data Elements
The NIS is set of longitudinal hospital inpatient databases included in the HCUP family. These databases are created by AHRQ through a Federal-State-Industry partnership.
 
YEAR - Calendar year
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

The discharge year (YEAR) is always coded. In the 1988-1997 HCUP databases, YEAR is two-digits (e.g., if the discharge year is 1990, then YEAR = 90). Beginning in the 1998 HCUP databases, YEAR is four-digits (e.g., 1998).

 
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Uniform Values
VariableDescriptionValueValue Description
YEARCalendar yearyy2-digit calendar year in 1988-1997 data
yyyy4-digit calendar year beginning with 1998 data
 
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State Specific Notes
None
 
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Internet Citation: HCUP NIS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). September 2008. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/vars/year/nisnote.jsp.
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Last modified 9/17/08