diff --git a/src/main/java/org/miracum/streams/ume/obdstofhir/FhirProperties.java b/src/main/java/org/miracum/streams/ume/obdstofhir/FhirProperties.java
index d9dc4ac0..023cd23e 100644
--- a/src/main/java/org/miracum/streams/ume/obdstofhir/FhirProperties.java
+++ b/src/main/java/org/miracum/streams/ume/obdstofhir/FhirProperties.java
@@ -76,6 +76,7 @@ public static class FhirSystems {
     private String miiCsOnkoStrahlentherapieZielgebiet;
     private String strahlentherapieProcedureId;
     private String systemischeTherapieProcedureId;
+    private String systemischeTherapieMedicationStatementId;
     private String miiCsOnkoSystemischeTherapieArt;
     private String miiCsOnkoSeitenlokalisation;
     private String miiCsTherapieGrundEnde;
diff --git a/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapper.java b/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapper.java
index c9901ac2..a5950d03 100644
--- a/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapper.java
+++ b/src/main/java/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapper.java
@@ -75,7 +75,8 @@ public Bundle map(SYSTTyp syst, Reference patient, Reference procedure) {
         // if not we may instead need to construct the ID from the patient-id + others.
         var identifier =
             new Identifier()
-                .setSystem(fhirProperties.getSystems().getSystemischeTherapieProcedureId())
+                .setSystem(
+                    fhirProperties.getSystems().getSystemischeTherapieMedicationStatementId())
                 .setValue(String.format("%s_%s", syst.getSYSTID(), substanzId));
         systMedicationStatement.addIdentifier(identifier);
         systMedicationStatement.setId(computeResourceIdFromIdentifier(identifier));
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index ee6ffd9c..f0ce33b6 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -30,6 +30,7 @@ fhir:
     psaObservationId: "${fhir.default.baseSystemUrl}/obds-to-fhir/identifiers/psa-observation-id"
     strahlentherapie-procedure-id: "${fhir.default.baseSystemUrl}/obds-to-fhir/identifiers/strahlentherapie-procedure-id"
     systemische-therapie-procedure-id: "${fhir.default.baseSystemUrl}/obds-to-fhir/identifiers/systemische-therapie-procedure-id"
+    systemische-therapie-medication-statement-id: "${fhir.default.baseSystemUrl}/obds-to-fhir/identifiers/systemische-therapie-medication-statement-id"
     loinc: "http://loinc.org"
     icdo3Morphologie: "http://terminology.hl7.org/CodeSystem/icd-o-3"
     icdo3MorphologieOid: "urn:oid:2.16.840.1.113883.6.43.1"
diff --git a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_1.xml.approved.fhir.json b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_1.xml.approved.fhir.json
index 42f73feb..432b740b 100644
--- a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_1.xml.approved.fhir.json
+++ b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_1.xml.approved.fhir.json
@@ -2,15 +2,15 @@
   "resourceType": "Bundle",
   "type": "transaction",
   "entry": [ {
-    "fullUrl": "MedicationStatement/99635bf8744dadda1f8b293046f2bfb3d021938263616e6228523113af2695c1",
+    "fullUrl": "MedicationStatement/050a031e5a9043c28c565c6b60550c3d34cd059bc2f24c195cdb807f099cd978",
     "resource": {
       "resourceType": "MedicationStatement",
-      "id": "99635bf8744dadda1f8b293046f2bfb3d021938263616e6228523113af2695c1",
+      "id": "050a031e5a9043c28c565c6b60550c3d34cd059bc2f24c195cdb807f099cd978",
       "meta": {
         "profile": [ "https://www.medizininformatik-initiative.de/fhir/core/modul-medikation/StructureDefinition/MedicationStatement" ]
       },
       "identifier": [ {
-        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-procedure-id",
+        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-medication-statement-id",
         "value": "101_IN-1_L01FF05"
       } ],
       "partOf": [ {
@@ -33,7 +33,7 @@
     },
     "request": {
       "method": "PUT",
-      "url": "MedicationStatement/99635bf8744dadda1f8b293046f2bfb3d021938263616e6228523113af2695c1"
+      "url": "MedicationStatement/050a031e5a9043c28c565c6b60550c3d34cd059bc2f24c195cdb807f099cd978"
     }
   } ]
 }
diff --git a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_2.xml.approved.fhir.json b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_2.xml.approved.fhir.json
index 33da4a46..6c8f7289 100644
--- a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_2.xml.approved.fhir.json
+++ b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_2.xml.approved.fhir.json
@@ -2,15 +2,15 @@
   "resourceType": "Bundle",
   "type": "transaction",
   "entry": [ {
-    "fullUrl": "MedicationStatement/2be692115f7383b050211e2c4b857655192448b28772b0a5af15839b1a84fa5e",
+    "fullUrl": "MedicationStatement/e4b35c4756c9668e9c2b92f281667382020c401482e0a674566a695cd20a4cfa",
     "resource": {
       "resourceType": "MedicationStatement",
-      "id": "2be692115f7383b050211e2c4b857655192448b28772b0a5af15839b1a84fa5e",
+      "id": "e4b35c4756c9668e9c2b92f281667382020c401482e0a674566a695cd20a4cfa",
       "meta": {
         "profile": [ "https://www.medizininformatik-initiative.de/fhir/core/modul-medikation/StructureDefinition/MedicationStatement" ]
       },
       "identifier": [ {
-        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-procedure-id",
+        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-medication-statement-id",
         "value": "11_1_Innere.1_Bicalutamid_fa96"
       } ],
       "partOf": [ {
@@ -29,7 +29,7 @@
     },
     "request": {
       "method": "PUT",
-      "url": "MedicationStatement/2be692115f7383b050211e2c4b857655192448b28772b0a5af15839b1a84fa5e"
+      "url": "MedicationStatement/e4b35c4756c9668e9c2b92f281667382020c401482e0a674566a695cd20a4cfa"
     }
   } ]
 }
diff --git a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_3.xml.approved.fhir.json b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_3.xml.approved.fhir.json
index f266efc3..e5a45a30 100644
--- a/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_3.xml.approved.fhir.json
+++ b/src/test/java/snapshots/org/miracum/streams/ume/obdstofhir/mapper/mii/SystemischeTherapieMedicationStatementMapperTest.map_withGivenObds_shouldCreateValidMedicationStatement.Testpatient_3.xml.approved.fhir.json
@@ -2,15 +2,15 @@
   "resourceType": "Bundle",
   "type": "transaction",
   "entry": [ {
-    "fullUrl": "MedicationStatement/69e986083bed8b3ee0519fda269bfa44104d421348ccd8214f1af901b26650df",
+    "fullUrl": "MedicationStatement/da9d78a5d066bba6acd32a9a903c8663ecc1421cb373dcb51566b6d23dd30df7",
     "resource": {
       "resourceType": "MedicationStatement",
-      "id": "69e986083bed8b3ee0519fda269bfa44104d421348ccd8214f1af901b26650df",
+      "id": "da9d78a5d066bba6acd32a9a903c8663ecc1421cb373dcb51566b6d23dd30df7",
       "meta": {
         "profile": [ "https://www.medizininformatik-initiative.de/fhir/core/modul-medikation/StructureDefinition/MedicationStatement" ]
       },
       "identifier": [ {
-        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-procedure-id",
+        "system": "https://bzkf.github.io/obds-to-fhir/identifiers/systemische-therapie-medication-statement-id",
         "value": "12_1_Innere.1_Paclitaxel_a0a4"
       } ],
       "partOf": [ {
@@ -29,7 +29,7 @@
     },
     "request": {
       "method": "PUT",
-      "url": "MedicationStatement/69e986083bed8b3ee0519fda269bfa44104d421348ccd8214f1af901b26650df"
+      "url": "MedicationStatement/da9d78a5d066bba6acd32a9a903c8663ecc1421cb373dcb51566b6d23dd30df7"
     }
   } ]
 }