diff --git a/src/main/kotlin/no/digdir/catalog_admin_service/model/Code.kt b/src/main/kotlin/no/digdir/catalog_admin_service/model/Code.kt
index 8c5a8e8..2c64149 100644
--- a/src/main/kotlin/no/digdir/catalog_admin_service/model/Code.kt
+++ b/src/main/kotlin/no/digdir/catalog_admin_service/model/Code.kt
@@ -1,7 +1,7 @@
 package no.digdir.catalog_admin_service.model
 
 data class Code(
-    val id: Int,
+    val id: String,
     val name: MultiLanguageTexts,
-    val parentID: Int?
+    val parentID: String?
 )
diff --git a/src/main/kotlin/no/digdir/catalog_admin_service/service/CodeListService.kt b/src/main/kotlin/no/digdir/catalog_admin_service/service/CodeListService.kt
index 278ef4c..24d57c0 100644
--- a/src/main/kotlin/no/digdir/catalog_admin_service/service/CodeListService.kt
+++ b/src/main/kotlin/no/digdir/catalog_admin_service/service/CodeListService.kt
@@ -37,7 +37,7 @@ class CodeListService(
     private val internalFieldsRepository: InternalFieldsRepository,
 ) {
     private fun CodeList.subjectsURI() = "${applicationProperties.adminServiceUri}/$catalogId/concepts/subjects"
-    private fun createCodeURI(codeListUri: String, codeId: Int) = "$codeListUri#$codeId"
+    private fun createCodeURI(codeListUri: String, codeId: String) = "$codeListUri#$codeId"
     private fun publisherURI(publisherId: String) = "https://data.brreg.no/enhetsregisteret/api/enheter/$publisherId"
 
     fun getCodeLists(catalogId: String): CodeLists =
@@ -151,7 +151,7 @@ class CodeListService(
         return this
     }
 
-    private fun Resource.createCodeResource(code: Code, childrenIds: List<Int>): Resource {
+    private fun Resource.createCodeResource(code: Code, childrenIds: List<String>): Resource {
         val codeURI = createCodeURI(uri, code.id)
         return model.createResource(codeURI, SKOS.Concept)
             .addProperty(DCTerms.identifier, model.createTypedLiteral(codeURI, XSDDateType.XSDanyURI))
@@ -168,12 +168,12 @@ class CodeListService(
         return this
     }
 
-    private fun Resource.addBroader(codeListUri: String, parentId: Int?): Resource {
+    private fun Resource.addBroader(codeListUri: String, parentId: String?): Resource {
         if (parentId != null) addProperty(SKOS.broader, model.getResource(createCodeURI(codeListUri, parentId)))
         return this
     }
 
-    private fun Resource.addNarrower(codeListUri: String, childrenIds: List<Int>): Resource {
+    private fun Resource.addNarrower(codeListUri: String, childrenIds: List<String>): Resource {
         childrenIds.forEach { addProperty(SKOS.narrower, model.getResource(createCodeURI(codeListUri, it))) }
         return this
     }
diff --git a/src/test/kotlin/no/digdir/catalog_admin_service/utils/TestData.kt b/src/test/kotlin/no/digdir/catalog_admin_service/utils/TestData.kt
index 7f9acc9..4ff2568 100644
--- a/src/test/kotlin/no/digdir/catalog_admin_service/utils/TestData.kt
+++ b/src/test/kotlin/no/digdir/catalog_admin_service/utils/TestData.kt
@@ -33,14 +33,14 @@ val MONGO_ENV_VALUES: Map<String, String> = ImmutableMap.of(
 )
 
 val NAME: MultiLanguageTexts = MultiLanguageTexts(en = "codeName", nb = null, nn = null)
-val CODE: Code = Code(id = 555, name = NAME, parentID = null)
+val CODE: Code = Code(id = "555", name = NAME, parentID = null)
 val CODES: List<Code> = listOf(CODE)
 val CODE_LIST_0 =
     CodeList(id = "123", name = "name", description = "description", codes = CODES, catalogId = "910244132")
 val CODES_1 = listOf(
-    Code(1, MultiLanguageTexts("nb 1", "nn 1", "en 1"), null),
-    Code(2, MultiLanguageTexts("nb 2", "nn 2", "en 2"), 1),
-    Code(3, MultiLanguageTexts("nb 3", "nn 3", null), 1)
+    Code("1", MultiLanguageTexts("nb 1", "nn 1", "en 1"), null),
+    Code("2", MultiLanguageTexts("nb 2", "nn 2", "en 2"), "1"),
+    Code("3", MultiLanguageTexts("nb 3", "nn 3", null), "1")
 )
 val CODE_LIST_1 = CodeList(id = "321", name = "code list 1", description = "description of code list 1", codes = CODES_1, catalogId = "123456789")
 val CODE_LIST_2 = CodeList(id = "456", name = "code list 2", description = "description of code list 2", codes = CODES_1, catalogId = "910244132")