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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.
 
NDX - Number of ICD-9-CM diagnoses on this discharge
 
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes
 

NDX indicates the total number of ICD-9-CM diagnoses (valid and invalid) coded on the discharge record. In assigning NDX, the first listed diagnosis is included in the count, even if it is blank, so long as there is a secondary diagnosis present (see table below).

For data beginning in the fourth quarter of 2015, the count of the number of diagnoses is stored in the data element I10_NDX to indicate the implementation of the ICD-10-CM/PCS coding system.

Value Description
0 No diagnoses are coded on the record
1 Only the first listed diagnosis (DX1) is coded. All secondary diagnoses are blank.
2 One secondary diagnosis (DX2) is coded. The first listed diagnosis (DX1) may be coded or blank.
3 The second and third diagnoses (DX2 and DX3) are coded. The first listed diagnosis (DX1) may be coded or blank.
 
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Uniform Values
 
VariableDescriptionValueValue Description
NDXNumber of ICD-9-CM diagnoses on this discharge0 - nnNumber of diagnoses
 
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State Specific Notes

None

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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. www.hcup-us.ahrq.gov/db/vars/siddistnote.jsp?var=ndx.
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Last modified 8/12/08