description: The Advance Directive Information Performer Extension represents clinicians who actually and principally carry out the clinical services being documented. In a transfer of care this represents the healthcare providers involved in the current or pertinent historical care of the patient. Preferably, the patients key healthcare care team members would be listed, particularly their primary physician and any active consulting physicians, therapists, and counselors. package_name: hl7.fhir.us.pacio-adi derivation: constraint name: PerformerExtension type: Extension elements: extension: {index: 0} url: pattern: {type: uri, value: 'http://hl7.org/fhir/us/pacio-adi/StructureDefinition/adi-performer-extension'} type: uri index: 1 value: mustSupport: true choices: [valueReference] index: 3 valueReference: type: Reference mustSupport: true choiceOf: value refers: ['http://hl7.org/fhir/us/core/StructureDefinition/us-core-practitioner', 'http://hl7.org/fhir/us/core/StructureDefinition/us-core-practitionerrole'] index: 4 package_version: 2.0.0-ballot extensions: {} class: extension kind: complex-type url: http://hl7.org/fhir/us/pacio-adi/StructureDefinition/adi-performer-extension base: http://hl7.org/fhir/StructureDefinition/Extension version: 2.0.0-ballot required: [value, valueReference]