| Source Element | Usage | Target |
| EncounterHistory | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-EncounterHistory |
| EncounterHistory.id | UseExtensionFromAncestor | - |
| EncounterHistory.meta | UseExtensionFromAncestor | - |
| EncounterHistory.implicitRules | UseExtensionFromAncestor | - |
| EncounterHistory.language | UseExtensionFromAncestor | - |
| EncounterHistory.text | UseExtensionFromAncestor | - |
| EncounterHistory.contained | UseExtensionFromAncestor | - |
| EncounterHistory.extension | UseExtensionFromAncestor | - |
| EncounterHistory.modifierExtension | UseExtensionFromAncestor | - |
| EncounterHistory.encounter | UseExtensionFromAncestor | - |
| EncounterHistory.identifier | UseExtensionFromAncestor | - |
| EncounterHistory.status | UseExtensionFromAncestor | - |
| EncounterHistory.class | UseExtensionFromAncestor | - |
| EncounterHistory.type | UseExtensionFromAncestor | - |
| EncounterHistory.serviceType | UseExtensionFromAncestor | - |
| EncounterHistory.subject | UseExtensionFromAncestor | - |
| EncounterHistory.subjectStatus | UseExtensionFromAncestor | - |
| EncounterHistory.actualPeriod | UseExtensionFromAncestor | - |
| EncounterHistory.plannedStartDate | UseExtensionFromAncestor | - |
| EncounterHistory.plannedEndDate | UseExtensionFromAncestor | - |
| EncounterHistory.length | UseExtensionFromAncestor | - |
| EncounterHistory.location | UseExtensionFromAncestor | - |
| EncounterHistory.location.id | UseExtensionFromAncestor | - |
| EncounterHistory.location.extension | UseExtensionFromAncestor | - |
| EncounterHistory.location.modifierExtension | UseExtensionFromAncestor | - |
| EncounterHistory.location.location | UseExtensionFromAncestor | - |
| EncounterHistory.location.form | UseExtensionFromAncestor | - |