<status value="draft" /> <date value="2026-04-20T13:58:19+00:00" /> <publisher value="NHS England" /> <contact> <name value="NHS England" /> <telecom> <system value="email" /> <value value="interoperabilityteam@nhs.net" /> <use value="work" /> <rank value="1" /> </telecom> </contact> <description value="Only traced NHS Number **SHOULD** be used, un-traced NHS Numbers **MUST** be clearly indicated. NHS Data Dictionary: [NHS NUMBER](https://www.datadictionary.nhs.uk/data_elements/nhs_number.html).Format: ^[0-9]{10}$ (400 000 000 to 499 999 999, and 600 000 000 to 799 999) FHIR Naming System: [nhs-number](https://simplifier.net/ukfhircommunityassets/namingsystem-nhs-number)" /> <purpose value="This documents NHS England Data Dictionary and HL7 definitions" /> <copyright value="Copyright © 2023+ NHS England Licensed under the Apache License, Version 2.0 (the \&quot;License\&quot;); 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 \&quot;AS IS\&quot; 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" /> <type value="Identifier" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Identifier" /> <derivation value="constraint" /> <differential> <element id="Identifier.type.coding"> <path value="Identifier.type.coding" /> <min value="1" /> <max value="1" /> </element> <element id="Identifier.type.coding.system"> <path value="Identifier.type.coding.system" /> <fixedUri value="http://terminology.hl7.org/CodeSystem/v2-0203" /> </element> <element id="Identifier.type.coding.code"> <path value="Identifier.type.coding.code" /> <fixedCode value="NH" /> </element> <element id="Identifier.type.coding.display"> <path value="Identifier.type.coding.display" /> <short value="National Health Plan Identifier" /> <definition value="Class: Insurance Used for the UK NHS national identifier." /> <fixedString value="National Health Plan Identifier" /> </element> <element id="Identifier.system"> <path value="Identifier.system" /> <min value="1" /> <fixedUri value="https://fhir.nhs.uk/Id/nhs-number" /> </element> <element id="Identifier.value"> <path value="Identifier.value" /> <min value="1" /> <constraint> <key value="nhs-1" /> <severity value="error" /> <human value="NHS Number must be 10 digits. Valid allocation ranges include 400000000–499999999 and 600000000–799999999." /> <expression value="matches('^[0-9]{10}$')" /> </constraint> </element> </differential> </StructureDefinition>