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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.
 
DXCCSn - Clinical Classifications Software (CCS): ICD-9-CM diagnosis classification
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

Clinical Classifications Software (CCS) consists of over 260 diagnosis categories. All ICD-9-CM diagnosis codes are classified.

DXCCSn is coded as follows:

  • 1 to 259 if the diagnosis code (DXn) is valid by the HCUP criteria and not an External Causes of Injury (E-code). The HCUP criteria for diagnosis 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.
  • 2601-2621 if the diagnosis code (DXn) is a valid E-code by the HCUP criteria.
  • DXCCSn is missing (.), if there is no diagnosis code (DXn = " ").
  • DXCCSn is set to invalid (.A), if the diagnosis code (DXn) is invalid by the HCUP criteria (EDX02).
  • DXCCSn is set to inconsistent (.C), if the diagnosis code (DXn) is inconsistent with age (EAGE04 and EAGE05) or sex of the patient (EDX03).

For data beginning in the fourth quarter of 2015, the CCS is stored in the data element I10_DXCCSn to indicate the implementation of the ICD-10-CM/PCS coding system. In HCUP databases before 1998, this data element is called DCCHPRn.

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
DXCCSnClinical Classifications Software (CCS): ICD-9-CM diagnosis classification1-259CCS Diagnosis Codes
260CCS E-code Class (1988-1997 data)
2601-2621CCS E-code Class (beginning with 1998 data)
.No diagnosis code
.AInvalid diagnosis code: beginning with 1998 data, EDX02
.CInconsistent: beginning with 1998 data, EAGE04, EAGE05, EDX03
 
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State Specific Notes

Massachusetts

Due to an error in HCUP processing, about 9,000 records in the 1999 MA SID have an incorrect value of DXCCSn. The value 260 was assigned instead of the value of 2621 for E-codes in the range of E8490-E8499.


 
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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/dxccsn/nisnote.jsp.
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Last modified 9/17/08