| Source Element | Usage | Target |
| FormularyItem | UseExtension | http://hl7.org/fhir/5.0/StructureDefinition/extension-FormularyItem |
| FormularyItem.id | UseExtensionFromAncestor | - |
| FormularyItem.meta | UseExtensionFromAncestor | - |
| FormularyItem.implicitRules | UseExtensionFromAncestor | - |
| FormularyItem.language | UseExtensionFromAncestor | - |
| FormularyItem.text | UseExtensionFromAncestor | - |
| FormularyItem.contained | UseExtensionFromAncestor | - |
| FormularyItem.extension | UseExtensionFromAncestor | - |
| FormularyItem.modifierExtension | UseExtensionFromAncestor | - |
| FormularyItem.identifier | UseExtensionFromAncestor | - |
| FormularyItem.code | UseExtensionFromAncestor | - |
| FormularyItem.status | UseExtensionFromAncestor | - |