http://hl7.org/fhir/us/core/StructureDefinition/us-core-birthsex|8.0.0-ballot

A code classifying the person's sex assigned at birth as specified by the [Office of the National Coordinator for Health IT (ONC)](https://www.healthit.gov/newsroom/about-onc). This extension aligns with the C-CDA Birth Sex Observation (LOINC 76689-9). After version 6.0.0, this extension is no longer a *USCDI Requirement*.