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The Core ontology is a static snapshot of underlying standards. As they change (for example, regular updates of ICD-9-CM and RxNorm), we expect that the Core ontology will follow after a reasonable delay to accommodate the effort of introducing the changes, resolving issues and quality assurance processes.

Demographics

• Age
• Gender - HL7 Administrative Gender
• Language - ISO 639-1
• Marital Status - HL7 Marital Status
• Race and Ethnicity -CDC Race & Ethnicity Code Sets

Diagnoses

•  ICD-9-CM terms and hierarchy

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