diff --git a/NamingSystem/uk-gmc-number.xml b/NamingSystem/uk-gmc-number.xml
index c42475ab..ac68428d 100644
--- a/NamingSystem/uk-gmc-number.xml
+++ b/NamingSystem/uk-gmc-number.xml
@@ -4,11 +4,11 @@
     <name value="UKgmcnumber"/>
     <status value="draft"/>
     <kind value="identifier"/>
-    <date value="2019-12-03"/>
+    <date value="2026-06-29"/>
     <publisher value="HL7 UK"/>
     <responsible value="General Medical Council"/>
-    <description value="General Medical Council Consultant Code. See [NHS Data Dictionary](https://www.datadictionary.nhs.uk/data_dictionary/attributes/g/general_medical_practitioner_ppd_code_de.asp)"/>
-    <usage value="A unique consultant code, used to identify consultants"/>
+    <description value="Duplicate.[UK NamingSystem-GMC-Number](https://simplifier.net/guide/UKNamingSystems/Home/Identifiersystems/IndexofIdentifierNamingsystems?version=current#GMCNumber) in UK FHIR Community Assets."/>
+    <usage value="Duplicate. See [UK NamingSystem-GMC-Number](https://simplifier.net/guide/UKNamingSystems/Home/Identifiersystems/IndexofIdentifierNamingsystems?version=current#GMCNumber) "/>
     <uniqueId>
         <type value="uri"/>
         <value value="https://fhir.hl7.org.uk/Id/gmc-number"/>
@@ -16,13 +16,7 @@
     </uniqueId>
     <uniqueId>
         <type value="oid"/>
-        <value value="2.16.840.1.113883.2.1.3.2.4.16.63"/>
+        <value value="2.16.840.1.113883.2.1.3.2.4.18.29"/>
         <preferred value="false"/>
     </uniqueId>
-    <uniqueId>
-        <type value="other"/>
-        <value value="GMC"/>
-        <preferred value="false"/>
-        <comment value="XCN.9 HSCIC HL7 V2 ADT"/>
-    </uniqueId>
 </NamingSystem>
\ No newline at end of file
diff --git a/NamingSystem/uk-gmc-reference-number.xml b/NamingSystem/uk-gmc-reference-number.xml
index 25d8695c..11ba9109 100644
--- a/NamingSystem/uk-gmc-reference-number.xml
+++ b/NamingSystem/uk-gmc-reference-number.xml
@@ -2,13 +2,13 @@
 <NamingSystem xmlns="http://hl7.org/fhir">
     <id value="uk-gmc-reference-number"/>
     <name value="UKgmcreferencenumber"/>
-    <status value="draft"/>
+    <status value="retired"/>
     <kind value="identifier"/>
-    <date value="2022-07-28"/>
+    <date value="2026-06-29"/>
     <publisher value="NHS Digital"/>
     <responsible value="General Medical Council"/>
-    <description value="General Medical Council Reference Number. See [NHS Data Dictionary](https://www.datadictionary.nhs.uk/attributes/general_medical_council_reference_number.html)"/>
-    <usage value="A unique reference number, used to identify consultants"/>
+    <description value="General Medical Council Reference Number. Retired. It is a duplicate of [UK NamingSystem-GMC-Number](https://simplifier.net/guide/UKNamingSystems/Home/Identifiersystems/IndexofIdentifierNamingsystems?version=current#GMCNumber) in UK FHIR Community Assets."/>
+    <usage value="Retired. See [UK NamingSystem-GMC-Number](https://simplifier.net/guide/UKNamingSystems/Home/Identifiersystems/IndexofIdentifierNamingsystems?version=current#GMCNumber)"/>
     <uniqueId>
         <type value="uri"/>
         <value value="https://fhir.hl7.org.uk/Id/gmc-reference-number"/>