# QI-Core Extensions - QI-Core Implementation Guide v8.0.0-ballot

## QI-Core Extensions

This page lists the [Extensions](http://hl7.org/fhir/extensibility.html) defined as part of the QI-Core Implementation Guide. A [registry of standard extensions](http://hl7.org/fhir/R4/extensibility-registry.html) can be found in the FHIR specification and additional extensions may be registered on the [HL7 FHIR registry](http://hl7.org/fhir/registry).

* [Code Options](StructureDefinition-codeOptions.md)

* [QI-Core Key Element Extension](StructureDefinition-qicore-keyelement.md)

