diff --git a/gp2gp-translator/src/main/java/uk/nhs/adaptors/pss/translator/util/ResourceFilterUtil.java b/gp2gp-translator/src/main/java/uk/nhs/adaptors/pss/translator/util/ResourceFilterUtil.java
index 0c8d1acab..1166a5eea 100644
--- a/gp2gp-translator/src/main/java/uk/nhs/adaptors/pss/translator/util/ResourceFilterUtil.java
+++ b/gp2gp-translator/src/main/java/uk/nhs/adaptors/pss/translator/util/ResourceFilterUtil.java
@@ -12,8 +12,7 @@
 
 public class ResourceFilterUtil {
     private static final List<String> ALLERGY_CODES = List.of("SN53.00", "14L..00");
-    private static final String IMMUNIZATION_SNOMED_CODE = "2.16.840.1.113883.2.1.3.2.3.15";
-    private static final String ALLERGY_SNOMED_CODE = "2.16.840.1.113883.2.1.6.2";
+    private static final String CODE_SYSTEM_READ_CODE_V2 = "2.16.840.1.113883.2.1.6.2";
     private static final String PATHOLOGY_CODE = "16488004";
     private static final String SPECIMEN_CODE = "123038009";
     private static final String BATTERY_VALUE = "BATTERY";
@@ -34,7 +33,7 @@ public static boolean isAllergyIntolerance(RCMRMT030101UK04CompoundStatement com
         return compoundStatement != null
             && hasCode(compoundStatement)
             && ALLERGY_CODES.contains(compoundStatement.getCode().getCode())
-            && ALLERGY_SNOMED_CODE.equals(compoundStatement.getCode().getCodeSystem())
+            && CODE_SYSTEM_READ_CODE_V2.equals(compoundStatement.getCode().getCodeSystem())
             && compoundStatement.getComponent().size() == 1
             && compoundStatement.getComponent().get(0).hasObservationStatement();
     }