diff --git a/README.md b/README.md
index 2090a6f..5eb406e 100644
--- a/README.md
+++ b/README.md
@@ -78,3 +78,20 @@ enthalten.
 
 Diese Liste der Gene unterliegt der folgenden Lizenz und ist frei
 verfügbar: [Creative Commons Public Domain (CC0) License](https://creativecommons.org/public-domain/cc0/).
+
+## Zusätzliche Informationen
+
+Weitere benötigte Informationen können ebenfalls abgerufen werden.
+
+```java
+var customMetadataMapper = new CustomMetadataDataMapper(
+        KpaCatalogue.create(new JdbcTemplate(datasource)),
+        PatientCatalogue.create(new JdbcTemplate(datasource))
+);
+
+var additional1 = customMetadataMapper.getByCaseId("16000123");
+// oder
+var additional2 = customMetadataMapper.getLatestByPatientIdAndTumorId("2000123456", 1);
+```
+
+Aktuell wird hier die Fallnummer und Krankenversicherungsnummer abgerufen.
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/CustomMetadata.java b/src/main/java/dev/pcvolkmer/onco/datamapper/CustomMetadata.java
new file mode 100644
index 0000000..3df07e8
--- /dev/null
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/CustomMetadata.java
@@ -0,0 +1,47 @@
+/*
+ * This file is part of mv64e-onkostar-data
+ *
+ * Copyright (C) 2025  Paul-Christian Volkmer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package dev.pcvolkmer.onco.datamapper;
+
+/**
+ * Custom metadata containing additional information
+ *
+ * @author Paul-Christian Volkmer
+ * @since 0.1
+ */
+public class CustomMetadata {
+
+    private final String fallnummer;
+    private final String kvnr;
+
+    public CustomMetadata(String fallnummer, String kvnr) {
+        this.fallnummer = fallnummer;
+        this.kvnr = kvnr;
+    }
+
+    public String getFallnummer() {
+        return fallnummer;
+    }
+
+    public String getKvnr() {
+        return kvnr;
+    }
+
+}
diff --git a/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/CustomMetadataDataMapper.java b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/CustomMetadataDataMapper.java
new file mode 100644
index 0000000..c79a3a3
--- /dev/null
+++ b/src/main/java/dev/pcvolkmer/onco/datamapper/mapper/CustomMetadataDataMapper.java
@@ -0,0 +1,85 @@
+/*
+ * This file is part of mv64e-onkostar-data
+ *
+ * Copyright (C) 2025  Paul-Christian Volkmer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+package dev.pcvolkmer.onco.datamapper.mapper;
+
+import dev.pcvolkmer.mv64e.mtb.Mtb;
+import dev.pcvolkmer.onco.datamapper.CustomMetadata;
+import dev.pcvolkmer.onco.datamapper.datacatalogues.KpaCatalogue;
+import dev.pcvolkmer.onco.datamapper.datacatalogues.PatientCatalogue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Mapper class to load and map custom metadata from database
+ *
+ * @author Paul-Christian Volkmer
+ * @since 0.1
+ */
+public class CustomMetadataDataMapper implements DataMapper<CustomMetadata> {
+
+    private final Logger logger = LoggerFactory.getLogger(this.getClass());
+
+    private final KpaCatalogue kpaCatalogue;
+    private final PatientCatalogue patientCatalogue;
+
+    public CustomMetadataDataMapper(final KpaCatalogue kpaCatalogue, final PatientCatalogue patientCatalogue) {
+        this.kpaCatalogue = kpaCatalogue;
+        this.patientCatalogue = patientCatalogue;
+    }
+
+
+    @Override
+    public CustomMetadata getById(int id) {
+        var kpaData = kpaCatalogue.getById(id);
+        var patientData = patientCatalogue.getById(kpaData.getInteger("patient_id"));
+
+        return new CustomMetadata(
+                kpaData.getString("fallnummermv"),
+                patientData.getString("verischerungsnummer")
+        );
+    }
+
+    /**
+     * Loads and maps using the case id
+     *
+     * @param caseId The case id
+     * @return The loaded Mtb file
+     */
+    public CustomMetadata getByCaseId(String caseId) {
+        return this.getById(
+                this.kpaCatalogue.getProcedureIdByCaseId(caseId)
+        );
+    }
+
+    /**
+     * Loads and maps using the patient id and tumor id
+     *
+     * @param patientId The patients id (not database id)
+     * @param tumorId   The tumor identification
+     * @return The loaded Mtb file
+     */
+    public CustomMetadata getLatestByPatientIdAndTumorId(String patientId, int tumorId) {
+        return this.getById(
+                this.kpaCatalogue
+                        .getLatestProcedureIdByPatientIdAndTumor(patientId, tumorId)
+        );
+    }
+}