diff --git a/tests/integration/test_host_mode_entity_fields.py b/tests/integration/test_host_mode_entity_fields.py
new file mode 100644
index 0000000000..cf3fa6916a
--- /dev/null
+++ b/tests/integration/test_host_mode_entity_fields.py
@@ -0,0 +1,93 @@
+"""Integration test for entity bit-packed fields."""
+
+from __future__ import annotations
+
+import asyncio
+
+from aioesphomeapi import EntityCategory, EntityState
+import pytest
+
+from .types import APIClientConnectedFactory, RunCompiledFunction
+
+
+@pytest.mark.asyncio
+async def test_host_mode_entity_fields(
+    yaml_config: str,
+    run_compiled: RunCompiledFunction,
+    api_client_connected: APIClientConnectedFactory,
+) -> None:
+    """Test entity bit-packed fields work correctly with all possible values."""
+    # Write, compile and run the ESPHome device, then connect to API
+    async with run_compiled(yaml_config), api_client_connected() as client:
+        # Get all entities
+        entities = await client.list_entities_services()
+
+        # Create a map of entity names to entity info
+        entity_map = {}
+        for entity in entities[0]:
+            if hasattr(entity, "name"):
+                entity_map[entity.name] = entity
+
+        # Test entities that should be visible via API (non-internal)
+        visible_test_cases = [
+            # (entity_name, expected_disabled_by_default, expected_entity_category)
+            ("Test Normal Sensor", False, EntityCategory.NONE),
+            ("Test Disabled Sensor", True, EntityCategory.NONE),
+            ("Test Diagnostic Sensor", False, EntityCategory.DIAGNOSTIC),
+            ("Test Switch", True, EntityCategory.CONFIG),
+            ("Test Binary Sensor", False, EntityCategory.CONFIG),
+            ("Test Number", False, EntityCategory.DIAGNOSTIC),
+        ]
+
+        # Test entities that should NOT be visible via API (internal)
+        internal_entities = [
+            "Test Internal Sensor",
+            "Test Mixed Flags Sensor",
+            "Test All Flags Sensor",
+            "Test Select",
+        ]
+
+        # Verify visible entities
+        for entity_name, expected_disabled, expected_category in visible_test_cases:
+            assert entity_name in entity_map, (
+                f"Entity '{entity_name}' not found - it should be visible via API"
+            )
+            entity = entity_map[entity_name]
+
+            # Check disabled_by_default flag
+            assert entity.disabled_by_default == expected_disabled, (
+                f"{entity_name}: disabled_by_default flag mismatch - "
+                f"expected {expected_disabled}, got {entity.disabled_by_default}"
+            )
+
+            # Check entity_category
+            assert entity.entity_category == expected_category, (
+                f"{entity_name}: entity_category mismatch - "
+                f"expected {expected_category}, got {entity.entity_category}"
+            )
+
+        # Verify internal entities are NOT visible
+        for entity_name in internal_entities:
+            assert entity_name not in entity_map, (
+                f"Entity '{entity_name}' found in API response - "
+                f"internal entities should not be exposed via API"
+            )
+
+        # Subscribe to states to verify has_state flag works
+        states: dict[int, EntityState] = {}
+        state_received = asyncio.Event()
+
+        def on_state(state: EntityState) -> None:
+            states[state.key] = state
+            state_received.set()
+
+        client.subscribe_states(on_state)
+
+        # Wait for at least one state
+        try:
+            await asyncio.wait_for(state_received.wait(), timeout=5.0)
+        except asyncio.TimeoutError:
+            pytest.fail("No states received within 5 seconds")
+
+        # Verify we received states (which means has_state flag is working)
+        assert len(states) > 0, "No states received - has_state flag may not be working"