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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.
 
PCLASSn - ICD-9-CM Procedure class
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

The Procedure Classes provide users an easy way to categorize ICD-9-CM procedure codes into one of four broad categories:

  • Minor Diagnostic: Non-operating room procedures that are diagnostic (e.g., 87.03 CT scan of head)
  • Minor Therapeutic - Non-operating room procedures that are therapeutic (e.g., 02.41 Irrigate ventricular shunt)
  • Major Diagnostic - All procedures considered valid operating room procedures by the Diagnosis Related Group (DRG) grouper and that are performed for diagnostic reasons (e.g., 01.14 Open brain biopsy)
  • Major Therapeutic - All procedures considered valid operating room procedures by the Diagnosis Related Group (DRG) grouper and that are performed for therapeutic reasons (e.g., 39.24 Aorta-renal bypass).

More information on the Procedure Class is available under Tools & Software on the HCUP-US Web site.

For data beginning in the fourth quarter of 2015, the procedure class is stored in the data element I10_PRCLASSn to indicate the implementation of the ICD-10-CM/PCS coding system.

 
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Uniform Values
VariableDescriptionValueValue Description
PCLASSnICD-9-CM Procedure class1Minor Diagnostic
2Minor Therapeutic
3Major Diagnostic
4Major Therapeutic
.Missing
.CInconsistent
.AInvalid
 
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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/pclassn/nisnote.jsp.
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Last modified 9/17/08