<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="Extension on HealthcareService.eligibility to indicate whether a service is restricted or unrestricted, and to list permitted GP service organisations." /> <purpose value="Supports eligibility-based access control for HealthcareService in Directory of Services use cases." /> <fhirVersion value="4.0.1" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="HealthcareService.eligibility" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <max value="1" /> <constraint> <key value="elig-1" /> <severity value="error" /> <human value="If restricted is true, at least one permitted service must be provided." /> <expression value="extension.where(url='restricted').valueBoolean = false or extension.where(url='services').exists()" /> </constraint> </element> <element id="Extension.extension"> <path value="Extension.extension" /> <slicing> <discriminator> <type value="value" /> <path value="url" /> </discriminator> <description value="Slices for restricted flag and permitted services" /> <ordered value="false" /> <rules value="open" /> </slicing> <min value="1" /> <max value="*" /> </element> <element id="Extension.extension:restricted"> <path value="Extension.extension" /> <sliceName value="restricted" /> <short value="Restricted indicator" /> <definition value="Indicates whether eligibility is restricted (true) or unrestricted (false)." /> <min value="1" /> <max value="1" /> </element> <element id="Extension.extension:restricted.url"> <path value="Extension.extension.url" /> <fixedUri value="restricted" /> </element> <element id="Extension.extension:restricted.valueBoolean"> <path value="Extension.extension.valueBoolean" /> <min value="1" /> <max value="1" /> <type> <code value="boolean" /> </type> </element> <element id="Extension.extension:services"> <path value="Extension.extension" /> <sliceName value="services" /> <short value="Permitted GP service organisations" /> <definition value="Reference to an Organization permitted under this eligibility rule." /> <min value="0" /> <max value="*" /> </element> <element id="Extension.extension:services.url"> <path value="Extension.extension.url" /> <fixedUri value="services" /> </element> <element id="Extension.extension:services.valueReference"> <path value="Extension.extension.valueReference" /> <min value="1" /> <max value="1" /> <type> <code value="Reference" /> <targetProfile value="http://hl7.org/fhir/StructureDefinition/Organization" /> </type> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="https://fhir.nhs.uk/England/StructureDefinition/Extension-England-HealthcareServiceEligibility" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <max value="0" /> </element> </differential> </StructureDefinition>