<status value="draft" /> <date value="2026-04-15" /> <publisher value="NHS England" /> <contact> <name value="NHS England" /> <telecom> <system value="email" /> <value value="interoperabilityteam@nhs.net" /> <use value="work" /> </telecom> </contact> <description value="An Extension to indicate whether the patient must confirm attendance for this appointment." /> <purpose value="When a user sets appointment-confirmationRequired = true, the system SHALL require the patient participant to be created with participant.status = needs-action, unless a prior confirmed response exists" /> <copyright value="Copyright © 2026+ HL7 UK Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. HL7® FHIR® standard Copyright © 2011+ HL7 The HL7® FHIR® standard is used under the FHIR license. You may obtain a copy of the FHIR license at https://www.hl7.org/fhir/license.html." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Appointment" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension.extension"> <path value="Extension.extension" /> <max value="0" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="https://fhir.nhs.uk/England/StructureDefinition/Extension-England-AppointmentConfirmationRequired" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <short value="Set to true to indicate appointment confirmation is required" /> <type> <code value="boolean" /> </type> </element> </differential> </StructureDefinition>