diff --git a/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-FAIL.xml b/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-FAIL.xml
new file mode 100644
index 00000000..2bc34ccd
--- /dev/null
+++ b/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-FAIL.xml
@@ -0,0 +1,46 @@
+<AllergyIntolerance xmlns="http://hl7.org/fhir">
+  <id value="UKCore-AllergyIntolerance-Amoxicillin-Example" />
+  <clinicalStatus>
+    <coding>
+      <system value="http://terminology.hl7.org/CodeSystem/allergyintolerance-clinical" />
+      <code value="active" />
+      <display value="Active" />
+    </coding>
+  </clinicalStatus>
+  <verificationStatus>
+    <coding>
+      <system value="http://terminology.hl7.org/CodeSystem/allergyintolerance-verification" />
+      <code value="confirmed" />
+      <display value="Confirmed" />
+    </coding>
+  </verificationStatus>
+  <code>
+    <coding>
+      <system value="http://snomed.info/sct" />
+      <code value="372687004" />
+      <display value="Amoxicillin" />
+    </coding>
+  </code>
+  <patient>
+    <reference value="Patient/UKCore-Patient-RichardSmith-Example" />
+  </patient>
+  <encounter>
+    <reference value="Encounter/UKCore-Encounter-InpatientEncounter-Example" />
+  </encounter>
+  <recordedDate value="2019-12-10T13:00:00+00:00" />
+  <recorder>
+    <reference value="Practitioner/UKCore-Practitioner-ConsultantSandraGose-Example" />
+  </recorder>
+  <asserter>
+    <reference value="Practitioner/UKCore-Practitioner-ConsultantSandraGose-Example" />
+  </asserter>
+  <reaction>
+    <manifestation>
+      <coding>
+        <system value="http://snomed.info/sct" />
+        <display value="Urticarial rash" />
+      </coding>
+    </manifestation>
+    <severity value="mild" />
+  </reaction>
+</AllergyIntolerance>
\ No newline at end of file
diff --git a/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-PASS-TEXT.xml b/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-PASS-TEXT.xml
new file mode 100644
index 00000000..d16db04c
--- /dev/null
+++ b/examples/UKCore-AllergyIntolerance-Amoxicillin-Example-PASS-TEXT.xml
@@ -0,0 +1,43 @@
+<AllergyIntolerance xmlns="http://hl7.org/fhir">
+  <id value="UKCore-AllergyIntolerance-Amoxicillin-Example" />
+  <clinicalStatus>
+    <coding>
+      <system value="http://terminology.hl7.org/CodeSystem/allergyintolerance-clinical" />
+      <code value="active" />
+      <display value="Active" />
+    </coding>
+  </clinicalStatus>
+  <verificationStatus>
+    <coding>
+      <system value="http://terminology.hl7.org/CodeSystem/allergyintolerance-verification" />
+      <code value="confirmed" />
+      <display value="Confirmed" />
+    </coding>
+  </verificationStatus>
+  <code>
+    <coding>
+      <system value="http://snomed.info/sct" />
+      <code value="372687004" />
+      <display value="Amoxicillin" />
+    </coding>
+  </code>
+  <patient>
+    <reference value="Patient/UKCore-Patient-RichardSmith-Example" />
+  </patient>
+  <encounter>
+    <reference value="Encounter/UKCore-Encounter-InpatientEncounter-Example" />
+  </encounter>
+  <recordedDate value="2019-12-10T13:00:00+00:00" />
+  <recorder>
+    <reference value="Practitioner/UKCore-Practitioner-ConsultantSandraGose-Example" />
+  </recorder>
+  <asserter>
+    <reference value="Practitioner/UKCore-Practitioner-ConsultantSandraGose-Example" />
+  </asserter>
+  <reaction>
+    <manifestation>
+      <text value="rash of some kind" />
+    </manifestation>
+    <severity value="mild" />
+  </reaction>
+</AllergyIntolerance>
\ No newline at end of file
diff --git a/structuredefinitions/UKCore-AllergyIntolerance.xml b/structuredefinitions/UKCore-AllergyIntolerance.xml
index 6c5f78d4..6c06773a 100644
--- a/structuredefinitions/UKCore-AllergyIntolerance.xml
+++ b/structuredefinitions/UKCore-AllergyIntolerance.xml
@@ -53,6 +53,15 @@
       <path value="AllergyIntolerance.verificationStatus" />
       <mustSupport value="true" />
     </element>
+    <element id="AllergyIntolerance.verificationStatus.coding">
+      <path value="AllergyIntolerance.verificationStatus.coding" />
+      <short value="A reference to a code defined by a terminology system" />
+      <comment value="Codes may be defined very casually in enumerations or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information." />
+      <type>
+        <code value="Coding" />
+        <profile value="https://hl7.org.uk/StructureDefinition/UKCoreCoding" />
+      </type>
+    </element>
     <element id="AllergyIntolerance.code">
       <path value="AllergyIntolerance.code" />
       <min value="1" />
@@ -84,6 +93,15 @@
         <valueSet value="https://fhir.hl7.org.uk/ValueSet/UKCore-AllergyManifestation" />
       </binding>
     </element>
+    <element id="AllergyIntolerance.reaction.manifestation.coding">
+      <path value="AllergyIntolerance.reaction.manifestation.coding" />
+      <short value="A reference to a code defined by a terminology system" />
+      <comment value="Codes may be defined very casually in enumerations or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information." />
+      <type>
+        <code value="Coding" />
+        <profile value="https://hl7.org.uk/StructureDefinition/UKCoreCoding" />
+      </type>
+    </element>
     <element id="AllergyIntolerance.reaction.severity">
       <path value="AllergyIntolerance.reaction.severity" />
       <mustSupport value="true" />
diff --git a/structuredefinitions/UKCore-Coding.xml b/structuredefinitions/UKCore-Coding.xml
new file mode 100644
index 00000000..5c448959
--- /dev/null
+++ b/structuredefinitions/UKCore-Coding.xml
@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<StructureDefinition xmlns="http://hl7.org/fhir">
+  <id value="UK-Core-Coding" />
+  <url value="https://hl7.org.uk/StructureDefinition/UKCoreCoding" />
+  <name value="UKCoreCoding" />
+  <title value="UKCore Coding" />
+  <status value="draft" />
+  <fhirVersion value="4.0.1" />
+  <kind value="complex-type" />
+  <abstract value="false" />
+  <type value="Coding" />
+  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Coding" />
+  <derivation value="constraint" />
+  <differential>
+    <element id="Coding.system">
+      <path value="Coding.system" />
+      <min value="1" />
+    </element>
+    <element id="Coding.code">
+      <path value="Coding.code" />
+      <min value="1" />
+    </element>
+  </differential>
+</StructureDefinition>
\ No newline at end of file