HCUP CODING PRACTICES |
This section describes the coding practices used to define the data elements in the HCUP databases. |
Table of Contents |
HCUP CODING PRACTICES
CODING OF DATA ELEMENTS ATTRIBUTES OF DATA ELEMENTS MISSING VALUES DIAGNOSIS AND PROCEDURE DATA ELEMENTS |
HCUP CODING PRACTICES |
The following objectives guided the definition of data elements included in the HCUP databases:
|
CODING OF DATA ELEMENTS | ||||||||||||||
Data elements are coded as shown in the following table:
| ||||||||||||||
ATTRIBUTES OF DATA ELEMENTS |
Data elements are defined as numeric or character.
|
MISSING VALUES |
Special missing values have been used in HCUP data elements to indicate details of data availability and quality. Missing values differ depending on whether you have obtained HCUP data in SAS or EBCDIC/ASCII formats.
Top
Top Top Top Top |
DIAGNOSIS AND PROCEDURE DATA ELEMENTS |
The coding of the diagnosis/procedure-specific data elements is interdependent and changes over time. These data elements are:
The following table demonstrates the relationship between these variables. |
Relationship Between Diagnosis and Procedure Codes and Their Associated Variables | |||
---|---|---|---|
Diagnosis (DXn)/ Procedure Code (PRn) | Year of Data | Validity Check | CCS Codes |
Missing (Blank) | 1988-1997 | DXVn/PRVn = missing (.) or (-9) | DCCHPRn/PCCHPRn = missing (.) or (-999) |
Starting in 1998 | No action | DXCCSn/PRCCSn = missing (.) or (-999) | |
Valid Code | 1988-1997 | DXVn/PRVn = 0 if consistent with age and sex; DXVn/PRVn = .C or -6 if inconsistent |
DCCHPRn = 1-260 PCCHPRn = 1-231 |
Starting in 1998 | No action | DXCCSn = 1-259, 2601-2620 PRCCSn = 1-231 |
|
Invalid Code | 1988-1997 | DXVn/PRVn = 1 | DCCHPRn/PCCHPRn = .A or -888 |
Starting in 1998 | DXn/PRn = "invl" | DXCCSn/PRCCSn = .A or -888 | |
Inconsistent Code (DXn/PRn inconsistent with age or sex) | 1988-1997 | DXVn/PRVn = .C or -6 | DCCHPRn = 1-260 PCCHPRn = 1-231 |
Starting in 1998 | DXn/PRn = "incn" | DXCCSn/PRCCSn = .C or -666 |
See the HCUP Quality Control Procedures section for details on diagnosis and procedure edits.
|
Internet Citation: HCUP Coding Practices. Healthcare Cost and Utilization Project (HCUP). September 2008. Agency for Healthcare Research and Quality, Rockville, MD. www.hcup-us.ahrq.gov/db/coding.jsp. |
Are you having problems viewing or printing pages on this Website? |
If you have comments, suggestions, and/or questions, please contact hcup@ahrq.gov. |
Last modified 9/25/08 |