Introduction to the HCUP Nationwide Inpatient Sample (NIS)

WHAT’S NEW IN THE 2009
NATIONWIDE INPATIENT SAMPLE (NIS)?
• The 2009 NIS contains two additional states: New Mexico and Montana.
• The following data elements were added to the Core File beginning with the 2009
NIS:
o Ten additional secondary diagnoses for a total of 25 diagnoses
o
o
Ten additional secondary Clinical Classifications Software (CCS)
diagnosis categories
Major Diagnosic Category (MDC) in use on discharge date, calculated
without Present on Admission (POA) indicators (MDC_NoPOA).
MDC_NoPOA and the Diagnosis Related Group (DRG) calculated without
POA indicators (DRG_NoPOA) are useful because the lack of POA flags
from many states prevents the assignment of the standard MDC and
DRG for a few DRGs involving Hospital Acquired Conditions (HAC).
• The following data elements were added to the Diagnosis and Procedure Groups
(DX_PR_GRPS) File beginning with the 2009 NIS:
o Multi-level CCS categories for the principal diagnosis and the first listed
E-code and procedure.
o
o
Ten additional Chronic Condition Indicators
Ten additional Chronic Condition Body System Indicators
• Georgia and Illinois provide race/ethnicity data for the first time for data year 2009.
In addition, Iowa improved their race/ethnicity data in 2009 by capturing information
about the Hispanic population.
• The 2009 NIS is distributed on a single DVD-ROM instead of two CD-ROMs.
HCUP NIS (09/06/2011) 3 Introduction