Which module does every implementor work with, whichever way they use in FHIR?

Which module does every implementor work with, whichever way they use in FHIR?

• A. Implementation Support Module
• B. Security and Privacy Module
• C. Foundation module
• D. Foundation Framework

Answer: (C)

The Foundation module is the universal starting point in FHIR. It defines the base data types (like string, dateTime, boolean), the root resource structures (Resource, DomainResource, BackboneElement), and the common metadata fields (id, meta, implicitRules, language) that all resources rely on. Because every implementor, regardless of how they expose or profile data (REST, messaging, or otherwise), must interpret these core elements, they must work with the Foundation module. The other options address aspects like security or conformance tooling, but they aren’t the baseline that every implementation fundamentally depends on, and “Foundation Framework” isn’t a standard FHIR term.

The Foundation module is the universal starting point in FHIR. It defines the base data types (like string, dateTime, boolean), the root resource structures (Resource, DomainResource, BackboneElement), and the common metadata fields (id, meta, implicitRules, language) that all resources rely on. Because every implementor, regardless of how they expose or profile data (REST, messaging, or otherwise), must interpret these core elements, they must work with the Foundation module. The other options address aspects like security or conformance tooling, but they aren’t the baseline that every implementation fundamentally depends on, and “Foundation Framework” isn’t a standard FHIR term.