diff --git a/homeassistant/components/matter/adapter.py b/homeassistant/components/matter/adapter.py
index e6185de17a6..a3536435ded 100644
--- a/homeassistant/components/matter/adapter.py
+++ b/homeassistant/components/matter/adapter.py
@@ -185,10 +185,14 @@ class MatterAdapter:
             endpoint,
         )
         identifiers = {(DOMAIN, f"{ID_TYPE_DEVICE_ID}_{node_device_id}")}
+        serial_number: str | None = None
         # if available, we also add the serialnumber as identifier
-        if basic_info.serialNumber and "test" not in basic_info.serialNumber.lower():
+        if (
+            basic_info_serial_number := basic_info.serialNumber
+        ) and "test" not in basic_info_serial_number.lower():
             # prefix identifier with 'serial_' to be able to filter it
-            identifiers.add((DOMAIN, f"{ID_TYPE_SERIAL}_{basic_info.serialNumber}"))
+            identifiers.add((DOMAIN, f"{ID_TYPE_SERIAL}_{basic_info_serial_number}"))
+            serial_number = basic_info_serial_number
 
         model = (
             get_clean_name(basic_info.productName) or device_type.__name__
@@ -203,6 +207,7 @@ class MatterAdapter:
             sw_version=basic_info.softwareVersionString,
             manufacturer=basic_info.vendorName or endpoint.node.device_info.vendorName,
             model=model,
+            serial_number=serial_number,
             via_device=(DOMAIN, bridge_device_id) if bridge_device_id else None,
         )
 
diff --git a/tests/components/matter/test_adapter.py b/tests/components/matter/test_adapter.py
index 603e984779e..5f6c48dfcc6 100644
--- a/tests/components/matter/test_adapter.py
+++ b/tests/components/matter/test_adapter.py
@@ -56,6 +56,7 @@ async def test_device_registry_single_node_device(
     assert entry.model == "Mock Light"
     assert entry.hw_version == "v1.0"
     assert entry.sw_version == "v1.0"
+    assert entry.serial_number == "12345678"
 
 
 # This tests needs to be adjusted to remove lingering tasks
@@ -84,6 +85,7 @@ async def test_device_registry_single_node_device_alt(
 
     # test serial id NOT present as additional identifier
     assert (DOMAIN, "serial_TEST_SN") not in entry.identifiers
+    assert entry.serial_number is None
 
 
 @pytest.mark.skip("Waiting for a new test fixture")