diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapper.java
index c19def6..f243d3e 100644
--- a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapper.java
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapper.java
@@ -88,15 +88,24 @@ public class KpaPatientDataMapper implements DataMapper<Patient> {
     }
 
     private HealthInsurance getHealthInsurance(ResultSet data) {
+        var resultBuilder = HealthInsurance.builder()
+                .reference(
+                        Reference.builder()
+                                .id(data.getString("krankenkasse"))
+                                .system("https://www.dguv.de/arge-ik")
+                                .type("HealthInsurance")
+                                .build()
+                );
+
         var healthInsuranceCodingBuilder = HealthInsuranceCoding.builder()
                 .system("http://fhir.de/CodeSystem/versicherungsart-de-basis");
 
-        String healthInsuranceType = data.getString("artderkrankenkasse");
+        var healthInsuranceType = data.getString("artderkrankenkasse");
         if (healthInsuranceType == null) {
             healthInsuranceCodingBuilder
                     .code(HealthInsuranceCodingCode.UNK)
                     .build();
-            return HealthInsurance.builder().type(healthInsuranceCodingBuilder.build()).build();
+            return resultBuilder.type(healthInsuranceCodingBuilder.build()).build();
         }
 
         switch (healthInsuranceType) {
@@ -138,7 +147,7 @@ public class KpaPatientDataMapper implements DataMapper<Patient> {
 
         healthInsuranceCodingBuilder.display(healthInsurancePropertyEntry.getDescription());
 
-        return HealthInsurance.builder().type(healthInsuranceCodingBuilder.build()).build();
+        return resultBuilder.type(healthInsuranceCodingBuilder.build()).build();
     }
 
 }
diff --git a/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapperTest.java b/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapperTest.java
index 93c4785..317325f 100644
--- a/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapperTest.java
+++ b/src/test/java/dev/pcvolkmer/onco/datamapper/mapper/KpaPatientDataMapperTest.java
@@ -70,6 +70,7 @@ class KpaPatientDataMapperTest {
                 "geschlecht", "m",
                 "geburtsdatum", new java.sql.Date(Date.from(Instant.parse("2000-01-01T12:00:00Z")).getTime()),
                 "todesdatum", new java.sql.Date(Date.from(Instant.parse("2024-06-19T12:00:00Z")).getTime()),
+                "krankenkasse", "12345678",
                 "artderkrankenkasse", "GKV"
         );
 
@@ -98,13 +99,15 @@ class KpaPatientDataMapperTest {
         assertThat(actual.getBirthDate()).isEqualTo(Date.from(Instant.parse("2000-01-01T12:00:00Z")));
         assertThat(actual.getDateOfDeath()).isEqualTo(Date.from(Instant.parse("2024-06-19T12:00:00Z")));
         assertThat(actual.getHealthInsurance()).isEqualTo(
-                HealthInsurance.builder().type(
-                        HealthInsuranceCoding.builder()
-                                .code(HealthInsuranceCodingCode.GKV)
-                                .display("Gesetzliche Krankenversicherung")
-                                .system("http://fhir.de/CodeSystem/versicherungsart-de-basis")
-                                .build()
-                ).build()
+                HealthInsurance.builder()
+                        .reference(Reference.builder().id("12345678").system("https://www.dguv.de/arge-ik").type("HealthInsurance").build())
+                        .type(
+                                HealthInsuranceCoding.builder()
+                                        .code(HealthInsuranceCodingCode.GKV)
+                                        .display("Gesetzliche Krankenversicherung")
+                                        .system("http://fhir.de/CodeSystem/versicherungsart-de-basis")
+                                        .build()
+                        ).build()
         );
     }
 
@@ -114,6 +117,7 @@ class KpaPatientDataMapperTest {
                 "patient_id", "1",
                 "geschlecht", "w",
                 "geburtsdatum", new java.sql.Date(Date.from(Instant.parse("2000-01-01T12:00:00Z")).getTime()),
+                "krankenkasse", "12345678",
                 "artderkrankenkasse", "PKV"
         );
 
@@ -142,13 +146,15 @@ class KpaPatientDataMapperTest {
         assertThat(actual.getBirthDate()).isEqualTo(Date.from(Instant.parse("2000-01-01T12:00:00Z")));
         assertThat(actual.getDateOfDeath()).isNull();
         assertThat(actual.getHealthInsurance()).isEqualTo(
-                HealthInsurance.builder().type(
-                        HealthInsuranceCoding.builder()
-                                .code(HealthInsuranceCodingCode.PKV)
-                                .display("Private Krankenversicherung")
-                                .system("http://fhir.de/CodeSystem/versicherungsart-de-basis")
-                                .build()
-                ).build()
+                HealthInsurance.builder()
+                        .reference(Reference.builder().id("12345678").system("https://www.dguv.de/arge-ik").type("HealthInsurance").build())
+                        .type(
+                                HealthInsuranceCoding.builder()
+                                        .code(HealthInsuranceCodingCode.PKV)
+                                        .display("Private Krankenversicherung")
+                                        .system("http://fhir.de/CodeSystem/versicherungsart-de-basis")
+                                        .build()
+                        ).build()
         );
     }