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DXATADMITn - Diagnosis present at admission
Documentation Sections:
General Notes
Uniform Values
State Specific Notes
General Notes

DXatAdmitn indicates whether each diagnosis (DXn) was present at admission. This provides an indicator of complications arising during a hospitalization. If there is a time of onset for which no diagnosis code is present, DXatAdmitn is set to missing (.).

In HCUP databases before 1998, this data element is called TMDXn.

Uniform Values
VariableDescriptionValueValue Description
DXATADMITnDiagnosis present at admission0Diagnosis not present at admission
1Diagnosis present at admission
.Missing or diagnosis is an E-code
State Specific Notes


California supplies 25 diagnoses; DXatADMIT1-DXatADMIT25 corresponds to DX1-DX25, respectively. California also supplies 5 separate ECODEs that, prior to 2003, were placed at the end of the diagnosis array. For these years, there is no indication of the presence of the diagnosis at admission for DX26-DX30 because these variables contain E-codes.

New York

DXatAdmit1 was not supplied by New York, because the principal diagnosis was, by definition, present at the time of admission. Therefore, DXatAdmit1 was imputed to a value of one for all records.

DXatAdmitn for E-codes were not reported by New York and were set to missing (.) during HCUP processing (see DXn note for information on placement of E-codes in the diagnosis vector).


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