diff --git a/litellm/tests/test_router_tag_routing.py b/litellm/tests/test_router_tag_routing.py
index 67f100d79..4da109a13 100644
--- a/litellm/tests/test_router_tag_routing.py
+++ b/litellm/tests/test_router_tag_routing.py
@@ -91,3 +91,64 @@ async def test_router_free_paid_tier():
         print("response_extra_info: ", response_extra_info)
 
         assert response_extra_info["model_id"] == "very-expensive-model"
+
+
+@pytest.mark.asyncio()
+async def test_default_tagged_deployments():
+    """
+    - only use default deployment for untagged requests
+    - if a request has tag "default", use default deployment
+    """
+
+    router = litellm.Router(
+        model_list=[
+            {
+                "model_name": "gpt-4",
+                "litellm_params": {
+                    "model": "gpt-4o",
+                    "api_base": "https://exampleopenaiendpoint-production.up.railway.app/",
+                    "tags": ["default"],
+                },
+                "model_info": {"id": "default-model"},
+            },
+            {
+                "model_name": "gpt-4",
+                "litellm_params": {
+                    "model": "gpt-4o-mini",
+                    "api_base": "https://exampleopenaiendpoint-production.up.railway.app/",
+                    "tags": ["teamA"],
+                },
+                "model_info": {"id": "very-expensive-model"},
+            },
+        ],
+        enable_tag_filtering=True,
+    )
+
+    for _ in range(5):
+        # Untagged request, this should pick model with id == "default-model"
+        response = await router.acompletion(
+            model="gpt-4",
+            messages=[{"role": "user", "content": "Tell me a joke."}],
+        )
+
+        print("Response: ", response)
+
+        response_extra_info = response._hidden_params
+        print("response_extra_info: ", response_extra_info)
+
+        assert response_extra_info["model_id"] == "default-model"
+
+    for _ in range(5):
+        # requests tagged with "default", this should pick model with id == "default-model"
+        response = await router.acompletion(
+            model="gpt-4",
+            messages=[{"role": "user", "content": "Tell me a joke."}],
+            metadata={"tags": ["default"]},
+        )
+
+        print("Response: ", response)
+
+        response_extra_info = response._hidden_params
+        print("response_extra_info: ", response_extra_info)
+
+        assert response_extra_info["model_id"] == "default-model"