diff --git a/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/ObdsConditionMapper.java b/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/ObdsConditionMapper.java
index ed3be0be..c2b01a3c 100644
--- a/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/ObdsConditionMapper.java
+++ b/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/ObdsConditionMapper.java
@@ -73,7 +73,8 @@ public Bundle mapOnkoResourcesToCondition(
     // 'Tumorzuordung'
     // It's possible that 'Meldung.Diagnose' is set but 'Meldung.Diagnose.Primaertumor_*' is not,
     // in that case also use the TumorZuordnung to construct the Condition.
-    if (primDia == null || primDia.getPrimaertumor_ICD_Code() == null) {
+    var useTumorZuordnung = primDia == null || primDia.getPrimaertumor_ICD_Code() == null;
+    if (useTumorZuordnung) {
       primDia = meldung.getTumorzuordnung();
 
       if (primDia == null) {
@@ -88,6 +89,9 @@ public Bundle mapOnkoResourcesToCondition(
     }
 
     var conIdentifier = pid + "condition" + primDia.getTumor_ID();
+    if (useTumorZuordnung) {
+      conIdentifier += "-from-tumorzuordnung";
+    }
 
     onkoCondition.setId(this.getHash(ResourceType.Condition, conIdentifier));