diff --git a/src/main/java/de/uniluebeck/mi/projmi6/hapi/HL7Sender.java b/src/main/java/de/uniluebeck/mi/projmi6/hapi/HL7Sender.java
index 809a0fc..edaa6f2 100644
--- a/src/main/java/de/uniluebeck/mi/projmi6/hapi/HL7Sender.java
+++ b/src/main/java/de/uniluebeck/mi/projmi6/hapi/HL7Sender.java
@@ -77,7 +77,7 @@ public class HL7Sender {
         int i = 1;
         for (Diagnose diagnose : diagnosen) {
             Mitarbeiter arzt = diagnose.getArzt();
-            DG1 dg1 = adt.getDG1(i);
+            DG1 dg1 = adt.getDG1(i - 1);
             dg1.getDg11_SetIDDG1().setValue(String.valueOf(i));
             dg1.getDg13_DiagnosisCodeDG1().getIdentifier().parse(diagnose.getIcd10code().getCode());
             XCN xcn = dg1.getDg116_DiagnosingClinician(0);