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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.
 
PRCCSn - Clinical Classifications Software (CCS) for ICD-9-CM Procedures
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

Clinical Classifications Software (CCS) consists of 231 procedure categories. All ICD-9-CM procedure codes are classified.

PRCCSn is coded as follows:

  • 1 to 231 if the procedure code (PRn) is valid by the HCUP criteria. The HCUP criteria for procedure validation allows a year window (six months before and six months after) around the official ICD-9-CM coding changes (usually October 1), for anticipation of or lags in response to official ICD-9-CM coding changes.
  • PRCCSn is missing (.), if there is no procedure code (PRn = " ").
  • PRCCSn is set to invalid (.A), if the procedure code (PRn) is invalid by the HCUP criteria (EPR02).
  • PRCCSn is set to inconsistent (.C), if the procedure code (PRn) is inconsistent with age (EAGE05) or sex of the patient (EPR03).

For data beginning in the fourth quarter of 2015, the procedure CCS is stored in the data element I10_PRCCSn to indicate the implementation of the ICD-10-CM/PCS coding system. In HCUP databases before 1998, these data elements are called PCCHPRn.

Labels

Labels for CCS categories are provided as an ASCII file in HCUP Tools: Labels and Formats.

Formats

Formats to label CCS categories are documented in HCUP Tools: Labels and Formats. A format is also available to map CCS codes into a few broad classes of conditions based on ICD-9-CM chapters.

 
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Uniform Values
VariableDescriptionValueValue Description
PRCCSnClinical Classifications Software (CCS) for ICD-9-CM Procedures1 - 231CCS procedure class
.No procedure code
.AInvalid procedure code: beginning with 1998 data, EPR02
.CInconsistent: beginning with 1998 data, EAGE05, EPR03
 
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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/prccsn/nisnote.jsp.
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Last modified 9/17/08