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*.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/code
Extension.value[x].binding.valueSethttp://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113762.1.4.1021.24