diff --git a/redfish-core/lib/manager_diagnostic_data.hpp b/redfish-core/lib/manager_diagnostic_data.hpp
new file mode 100644
index 0000000..f4d1698
--- /dev/null
+++ b/redfish-core/lib/manager_diagnostic_data.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <app.hpp>
+#include <async_resp.hpp>
+#include <http_request.hpp>
+#include <nlohmann/json.hpp>
+#include <privileges.hpp>
+#include <routing.hpp>
+
+#include <string>
+
+namespace redfish
+{
+
+/**
+ * handleManagerDiagnosticData supports ManagerDiagnosticData.
+ * It retrieves BMC health information from various DBus resources and returns
+ * the information through the response.
+ */
+inline void handleManagerDiagnosticDataGet(
+    crow::App& app, const crow::Request& req,
+    const std::shared_ptr<bmcweb::AsyncResp>& asyncResp)
+{
+    if (!redfish::setUpRedfishRoute(app, req, asyncResp))
+    {
+        return;
+    }
+    asyncResp->res.jsonValue["@odata.type"] =
+        "#ManagerDiagnosticData.v1_0_0.ManagerDiagnosticData";
+    asyncResp->res.jsonValue["@odata.id"] =
+        "/redfish/v1/Managers/bmc/ManagerDiagnosticData";
+    asyncResp->res.jsonValue["Id"] = "ManagerDiagnosticData";
+    asyncResp->res.jsonValue["Name"] = "Manager Diagnostic Data";
+}
+
+inline void requestRoutesManagerDiagnosticData(App& app)
+{
+    BMCWEB_ROUTE(app, "/redfish/v1/Managers/bmc/ManagerDiagnosticData")
+        .privileges(redfish::privileges::getManagerDiagnosticData)
+        .methods(boost::beast::http::verb::get)(
+            std::bind_front(handleManagerDiagnosticDataGet, std::ref(app)));
+}
+
+} // namespace redfish
diff --git a/redfish-core/lib/managers.hpp b/redfish-core/lib/managers.hpp
index 039fced..52a3c85 100644
--- a/redfish-core/lib/managers.hpp
+++ b/redfish-core/lib/managers.hpp
@@ -15,17 +15,17 @@
 */
 #pragma once
 
+#include "app.hpp"
+#include "dbus_utility.hpp"
 #include "health.hpp"
+#include "query.hpp"
 #include "redfish_util.hpp"
+#include "registries/privilege_registry.hpp"
+#include "utils/sw_utils.hpp"
+#include "utils/systemd_utils.hpp"
 
-#include <app.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/date_time.hpp>
-#include <dbus_utility.hpp>
-#include <query.hpp>
-#include <registries/privilege_registry.hpp>
-#include <utils/sw_utils.hpp>
-#include <utils/systemd_utils.hpp>
 
 #include <cstdint>
 #include <memory>
@@ -1954,7 +1954,7 @@
             return;
         }
         asyncResp->res.jsonValue["@odata.id"] = "/redfish/v1/Managers/bmc";
-        asyncResp->res.jsonValue["@odata.type"] = "#Manager.v1_11_0.Manager";
+        asyncResp->res.jsonValue["@odata.type"] = "#Manager.v1_14_0.Manager";
         asyncResp->res.jsonValue["Id"] = "bmc";
         asyncResp->res.jsonValue["Name"] = "OpenBmc Manager";
         asyncResp->res.jsonValue["Description"] =
@@ -2054,6 +2054,12 @@
 
         managerGetLastResetTime(asyncResp);
 
+        // ManagerDiagnosticData is added for all BMCs.
+        nlohmann::json& managerDiagnosticData =
+            asyncResp->res.jsonValue["ManagerDiagnosticData"];
+        managerDiagnosticData["@odata.id"] =
+            "/redfish/v1/Managers/bmc/ManagerDiagnosticData";
+
         auto pids = std::make_shared<GetPIDValues>(asyncResp);
         pids->run();