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NIS Description of Data Elements

APRDRG_Severity - All Patient Refined DRG: Severity of Illness Subclass
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

The All Patient Refined DRGs (APR-DRGs) are assigned using software developed by 3M Health Information Systems. This severity measure includes the base APR-DRG, the severity of illness subclass, and the risk of mortality subclass within each base APR-DRG. The prefix "APRDRG" has been included in the data element names to distinguish APR-DRG measures from other HCUP data elements. For more information, please refer to the following documents available on the NIS Documentation CD-ROM and on the HCUP User Support Website (

  • Overview of Severity Systems
  • APR-DRGs V20 Methodology Booklet

Uniform Values
VariableDescriptionValueValue Description
APRDRG_SeverityAll Patient Refined DRG: Severity of Illness Subclass0No class specified
1Minor loss of function (includes cases with no comorbidity or complications)
2Moderate loss of function
3Major loss of function
4Extreme loss of function
State Specific Notes


For the 2002-2003 NIS, this data element is not available for discharges from Pennsylvania.


Internet Citation: HCUP NIS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). September 2008. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 9/17/08