Chapter 12

📖 Extensibility

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FHIR resources can be extended. As mentioned, the 80% rule limits their applicability to 80% of the most relevant use cases. To overcome this limitation. and to be able to use the resource for a use case of the remaining 20%, extensions can be added.

For example, in the US Core Specification, the Ethnicity extension is part of the patient resource. Extensions are resources on their own that can be added to a profile.

Video: FHIR Extensbility in 100 seconds.