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Central Distributor SID: Description of Data Elements

ADRGSEV - All Patient Refined DRG Complexity Subclass
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

The All Patient Refined DRG Complexity Subclass (ADRGSEV) reports the complexity subclass for the All Patient Refined DRGs (APR-DRGs). This is an indicator of the extent of physiologic decompensation or organ system loss of function. With the exception of newborn patients, each APR-DRG is subdivided into four complexity subclasses. Newborn DRGs have a complexity code of zero (0). Assignment to a complexity subclass is based, in part, on the complexity of a patient's secondary diagnoses, interactions among secondary diagnoses, age, principal diagnosis, and the presence of certain nonoperating room procedures.

APR-DRG complexity subclass codes are supplied by the data source. During HCUP processing, the codes are assigned as reported, without modification.

For more information see "All Patient Refined Diagnosis Related Groups (APR-DRGs)," published by 3M Health Information Services.

Uniform Values
VariableDescriptionValueValue Description
ADRGSEVAll Patient Refined DRG Complexity Subclass0Newborn DRGs
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 2018 - Q4 and 2019 Q1-Q3, the APR-DRGs were incorrectly assigned for infants under the age of 1 year admitted after the date of birth and that had no birth weight reported.

Beginning 2016, Massachusetts provides the 3M Health Information Systems All Patient Refined (APR) DRG grouper Version 34.0.

From 2014 through 2015, Massachusetts provides the APR-DRG Version 30.0.

From 2009 through 2013, Massachusetts provides the Version 26.1 grouper to assign ADRGSEV.

From October 2006 through September 2008, Massachusetts used the Version 20 grouper to assign ADRGSEV. Beginning in October 2008, Massachusetts no longer provided the Version 20 grouper to assign ADRGSEV. From October 1999 through September 2006, Massachusetts used Version 15. Prior to that, Massachusetts used the Version 12 grouper.


Source documentation does not include which version of the APR-DRG grouper was used.


Internet Citation: HCUP Central Distributor SID Description of Data Elements - All States. Healthcare Cost and Utilization Project (HCUP). August 2008. Agency for Healthcare Research and Quality, Rockville, MD.
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Last modified 8/12/08