diff --git a/litellm/router.py b/litellm/router.py
index c72dedc26df..845c388ecd6 100644
--- a/litellm/router.py
+++ b/litellm/router.py
@@ -9706,6 +9706,26 @@ class Router:
         _settings_to_return["routing_groups"] = [group.model_dump() for group in self._routing_groups.values()]
         return _settings_to_return
 
+    def _merge_default_litellm_params_setting(self, value: dict | None) -> None:
+        if value is not None:
+            self.default_litellm_params = {**self.default_litellm_params, **value}
+
+    def _apply_optional_pre_call_checks_setting(self, value: OptionalPreCallChecks | None) -> None:
+        if value is None:
+            return
+        new_checks = [check for check in value if check not in self.optional_pre_call_checks]
+        if new_checks:
+            self.add_optional_pre_call_checks(new_checks)
+
+    # Settings whose update logic doesn't fit `setattr(self, var, value)` (e.g.
+    # merge-not-replace, or side effects beyond storing the value). Dispatched via
+    # a single `var in ...` branch in update_settings so adding an entry here
+    # doesn't grow that function's branch count per field.
+    _CUSTOM_UPDATE_SETTINGS_HANDLERS: dict = {
+        "default_litellm_params": _merge_default_litellm_params_setting,
+        "optional_pre_call_checks": _apply_optional_pre_call_checks_setting,
+    }
+
     def update_settings(self, **kwargs):
         """
         Update the router settings.
@@ -9756,14 +9776,8 @@ class Router:
                         value = RetryPolicy(**value)
                     if value is None or isinstance(value, RetryPolicy):
                         setattr(self, var, value)
-                elif var == "default_litellm_params":
-                    if kwargs[var] is not None:
-                        self.default_litellm_params = {**self.default_litellm_params, **kwargs[var]}
-                elif var == "optional_pre_call_checks":
-                    if kwargs[var] is not None:
-                        new_checks = [check for check in kwargs[var] if check not in self.optional_pre_call_checks]
-                        if new_checks:
-                            self.add_optional_pre_call_checks(new_checks)
+                elif var in self._CUSTOM_UPDATE_SETTINGS_HANDLERS:
+                    self._CUSTOM_UPDATE_SETTINGS_HANDLERS[var](self, kwargs[var])
                 else:
                     value = kwargs[var]
                     # only run routing strategy init if it has changed
diff --git a/ui/litellm-dashboard/src/components/router_settings/OptionalPreCallChecksSelector.test.tsx b/ui/litellm-dashboard/src/components/router_settings/OptionalPreCallChecksSelector.test.tsx
index 2e4b7712c5f..ccda8a9d778 100644
--- a/ui/litellm-dashboard/src/components/router_settings/OptionalPreCallChecksSelector.test.tsx
+++ b/ui/litellm-dashboard/src/components/router_settings/OptionalPreCallChecksSelector.test.tsx
@@ -36,17 +36,13 @@ const options = ["prompt_caching", "router_budget_limiting", "session_affinity"]
 
 describe("OptionalPreCallChecksSelector", () => {
   it("should render one option per entry in options", () => {
-    render(
-      <OptionalPreCallChecksSelector value={[]} options={options} routerFieldsMetadata={{}} onChange={vi.fn()} />,
-    );
+    render(<OptionalPreCallChecksSelector value={[]} options={options} routerFieldsMetadata={{}} onChange={vi.fn()} />);
     const select = screen.getByTestId("optional-pre-call-checks-select") as HTMLSelectElement;
     expect(Array.from(select.options).map((o) => o.value)).toEqual(options);
   });
 
   it("should display default label when no metadata is provided", () => {
-    render(
-      <OptionalPreCallChecksSelector value={[]} options={options} routerFieldsMetadata={{}} onChange={vi.fn()} />,
-    );
+    render(<OptionalPreCallChecksSelector value={[]} options={options} routerFieldsMetadata={{}} onChange={vi.fn()} />);
     expect(screen.getByText("Optional Pre-call Checks")).toBeInTheDocument();
   });
 
diff --git a/ui/litellm-dashboard/src/components/router_settings/RouterSettingsForm.test.tsx b/ui/litellm-dashboard/src/components/router_settings/RouterSettingsForm.test.tsx
index c28633af171..ad3a0dcbf07 100644
--- a/ui/litellm-dashboard/src/components/router_settings/RouterSettingsForm.test.tsx
+++ b/ui/litellm-dashboard/src/components/router_settings/RouterSettingsForm.test.tsx
@@ -138,7 +138,10 @@ describe("RouterSettingsForm", () => {
     const props = {
       ...baseProps,
       routerFieldsMetadata: {
-        optional_pre_call_checks: { ui_field_name: "Optional Pre-call Checks", options: ["prompt_caching", "router_budget_limiting"] },
+        optional_pre_call_checks: {
+          ui_field_name: "Optional Pre-call Checks",
+          options: ["prompt_caching", "router_budget_limiting"],
+        },
       },
     };
     render(<RouterSettingsForm {...props} />);
diff --git a/ui/litellm-dashboard/src/lib/http/schema.d.ts b/ui/litellm-dashboard/src/lib/http/schema.d.ts
index 43bb465ec58..d4dc6e14d31 100644
--- a/ui/litellm-dashboard/src/lib/http/schema.d.ts
+++ b/ui/litellm-dashboard/src/lib/http/schema.d.ts
@@ -32223,6 +32223,10 @@ export interface components {
             }[] | null;
             /** Cooldown Time */
             cooldown_time?: number | null;
+            /** Default Litellm Params */
+            default_litellm_params?: {
+                [key: string]: unknown;
+            } | null;
             /** Fallbacks */
             fallbacks?: {
                 [key: string]: unknown;
@@ -32248,6 +32252,8 @@ export interface components {
             } | null;
             /** Num Retries */
             num_retries?: number | null;
+            /** Optional Pre Call Checks */
+            optional_pre_call_checks?: ("prompt_caching" | "router_budget_limiting" | "responses_api_deployment_check" | "deployment_affinity" | "session_affinity" | "forward_client_headers_by_model_group" | "enforce_model_rate_limits" | "encrypted_content_affinity")[] | null;
             /** Retry After */
             retry_after?: number | null;
             retry_policy?: components["schemas"]["RetryPolicy"] | null;