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Central Distributor SID: Description of Data Elements
This section describes how HCUP data elements are coded, restrictions on their use, their uniform values, and State-specific coding practices.
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 for CCS categories are provided as an ASCII file in HCUP Tools: Labels and 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.

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
State Specific Notes



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