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NASS Description of Data Elements

 
FEMALE - Indicator of sex
 
Documentation Sections:
General Notes
Uniform Values
General Notes
 

The sex of the patient (FEMALE) is provided by the data source. All non-male, non-female (e.g., "other") values are set to missing (.).

Prior to data year 2023, if FEMALE is inconsistent with diagnoses (EDX03), ICD-9-CM or ICD-10-CM/PCS procedures (EPR03), or HCPCS procedures (ECPT02), FEMALE is set to inconsistent (.C).

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

 
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Uniform Values
VariableDescriptionValueValue Description
FEMALEIndicator of sex0Male
1Female
.Missing
.AInvalid
.CInconsistent (prior to 2023)
 
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Internet Citation: HCUP NASS Description of Data Elements. Healthcare Cost and Utilization Project (HCUP). December 2025. Agency for Healthcare Research and Quality, Rockville, MD. hcup-us.ahrq.gov/db/vars/female/nassnote.jsp.
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Last modified 12/18/25