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Central Distributor SID: Description of Data Elements

TMDXn - Diagnosis present at admission

Documentation Sections:

TMDXn 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, TMDXn is set to missing (.).

Beginning in the 1998 data, this data element is called DXatAdmitn.

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Uniform Values

Variable	Description	Value	Value Description
TMDXn	Diagnosis present at admission	0	Diagnosis not present at admission
		1	Diagnosis present at admission
		.	Missing or diagnosis is an E-code
		.A	Invalid

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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). November 2025. Agency for Healthcare Research and Quality, Rockville, MD. hcup-us.ahrq.gov/db/vars/siddistnote.jsp?var=tmdxn.

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Last modified 11/19/25