diff --git a/x-pack/plugins/case/server/saved_object_types/migrations.ts b/x-pack/plugins/case/server/saved_object_types/migrations.ts
index 117e2eaeea4d8..bf9694d7e6bb0 100644
--- a/x-pack/plugins/case/server/saved_object_types/migrations.ts
+++ b/x-pack/plugins/case/server/saved_object_types/migrations.ts
@@ -8,7 +8,13 @@
 /* eslint-disable @typescript-eslint/naming-convention */
 
 import { SavedObjectUnsanitizedDoc, SavedObjectSanitizedDoc } from '../../../../../src/core/server';
-import { ConnectorTypes, CommentType, CaseType, AssociationType } from '../../common/api';
+import {
+  ConnectorTypes,
+  CommentType,
+  CaseType,
+  AssociationType,
+  ESConnectorFields,
+} from '../../common/api';
 
 interface UnsanitizedCaseConnector {
   connector_id: string;
@@ -24,7 +30,7 @@ interface SanitizedCaseConnector {
     id: string;
     name: string | null;
     type: string | null;
-    fields: null;
+    fields: null | ESConnectorFields;
   };
 }
 
@@ -88,13 +94,21 @@ export const caseMigrations = {
     };
   },
   '7.12.0': (
-    doc: SavedObjectUnsanitizedDoc<Record<string, unknown>>
-  ): SavedObjectSanitizedDoc<SanitizedCaseType> => {
+    doc: SavedObjectUnsanitizedDoc<SanitizedCaseConnector>
+  ): SavedObjectSanitizedDoc<SanitizedCaseType & SanitizedCaseConnector> => {
+    const { fields, type } = doc.attributes.connector;
     return {
       ...doc,
       attributes: {
         ...doc.attributes,
         type: CaseType.individual,
+        connector: {
+          ...doc.attributes.connector,
+          fields:
+            Array.isArray(fields) && fields.length > 0 && type === ConnectorTypes.serviceNowITSM
+              ? [...fields, { key: 'category', value: null }, { key: 'subcategory', value: null }]
+              : fields,
+        },
       },
       references: doc.references || [],
     };
diff --git a/x-pack/test/case_api_integration/basic/tests/cases/migrations.ts b/x-pack/test/case_api_integration/basic/tests/cases/migrations.ts
index e75ea0f8a89c9..f540aae68c5f7 100644
--- a/x-pack/test/case_api_integration/basic/tests/cases/migrations.ts
+++ b/x-pack/test/case_api_integration/basic/tests/cases/migrations.ts
@@ -84,6 +84,28 @@ export default function createGetTests({ getService }: FtrProviderContext) {
         expect(body).key('rule');
         expect(body.rule).to.eql({ id: null, name: null });
       });
+
+      it('adds category and subcategory to the ITSM connector', async () => {
+        const { body } = await supertest
+          .get(`${CASES_URL}/e1900ac0-017f-11eb-93f8-d161651bf509`)
+          .set('kbn-xsrf', 'true')
+          .send()
+          .expect(200);
+
+        expect(body).key('connector');
+        expect(body.connector).to.eql({
+          id: 'connector-1',
+          name: 'SN',
+          type: '.servicenow',
+          fields: {
+            impact: '1',
+            severity: '1',
+            urgency: '1',
+            category: null,
+            subcategory: null,
+          },
+        });
+      });
     });
   });
 }