diff --git a/src/Components/Diagnosis/ConsultationDiagnosisBuilder/PrincipalDiagnosisSelect.tsx b/src/Components/Diagnosis/ConsultationDiagnosisBuilder/PrincipalDiagnosisSelect.tsx
index 8018c6480ed..657451e4538 100644
--- a/src/Components/Diagnosis/ConsultationDiagnosisBuilder/PrincipalDiagnosisSelect.tsx
+++ b/src/Components/Diagnosis/ConsultationDiagnosisBuilder/PrincipalDiagnosisSelect.tsx
@@ -48,12 +48,18 @@ const PrincipalDiagnosisSelect = <T extends Option>(props: Props<T>) => {
           }}
           errorClassName="hidden"
         />
-        {diagnosis && (
-          <span className="mt-3 flex w-full flex-wrap justify-center gap-x-1 px-2 text-center text-gray-900">
-            <p>This encounter will be categorised under:</p>
-            <p className="font-bold">{diagnosis.chapter}</p>
-          </span>
-        )}
+        {diagnosis &&
+          (diagnosis.chapter ? (
+            <span className="mt-3 flex w-full flex-wrap justify-center gap-x-1 px-2 text-center text-gray-900">
+              <p>This encounter will be categorised under:</p>
+              <p className="font-bold">{diagnosis.chapter}</p>
+            </span>
+          ) : (
+            <span className="mt-3 flex w-full flex-wrap justify-center gap-x-1 px-2 text-center italic text-gray-700">
+              This encounter will not be categorised under any chapter as the
+              diagnosis does not fall under a chapter.
+            </span>
+          ))}
       </div>
     </div>
   );
diff --git a/src/Components/Diagnosis/types.ts b/src/Components/Diagnosis/types.ts
index 006bb2feb6c..694e7a482d6 100644
--- a/src/Components/Diagnosis/types.ts
+++ b/src/Components/Diagnosis/types.ts
@@ -3,7 +3,7 @@ import { PerformedByModel } from "../HCX/misc";
 export type ICD11DiagnosisModel = {
   id: string;
   label: string;
-  chapter: string;
+  chapter?: string;
 };
 
 export const ActiveConditionVerificationStatuses = [