diff --git a/homeassistant/components/motionmount/binary_sensor.py b/homeassistant/components/motionmount/binary_sensor.py
index c9d76ebb8d5..d0d6825ee40 100644
--- a/homeassistant/components/motionmount/binary_sensor.py
+++ b/homeassistant/components/motionmount/binary_sensor.py
@@ -6,6 +6,7 @@ from homeassistant.components.binary_sensor import (
     BinarySensorDeviceClass,
     BinarySensorEntity,
 )
+from homeassistant.const import EntityCategory
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
@@ -31,6 +32,7 @@ class MotionMountMovingSensor(MotionMountEntity, BinarySensorEntity):
 
     _attr_device_class = BinarySensorDeviceClass.MOVING
     _attr_translation_key = "motionmount_is_moving"
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
 
     def __init__(
         self, mm: motionmount.MotionMount, config_entry: MotionMountConfigEntry
diff --git a/homeassistant/components/motionmount/quality_scale.yaml b/homeassistant/components/motionmount/quality_scale.yaml
index 2648355c3af..7df450d88f3 100644
--- a/homeassistant/components/motionmount/quality_scale.yaml
+++ b/homeassistant/components/motionmount/quality_scale.yaml
@@ -56,7 +56,7 @@ rules:
   dynamic-devices:
     status: exempt
     comment: Single device per config entry
-  entity-category: todo
+  entity-category: done
   entity-device-class: done
   entity-disabled-by-default: todo
   entity-translations: done
diff --git a/homeassistant/components/motionmount/sensor.py b/homeassistant/components/motionmount/sensor.py
index 4950e5d6662..9ca8d2b0731 100644
--- a/homeassistant/components/motionmount/sensor.py
+++ b/homeassistant/components/motionmount/sensor.py
@@ -6,6 +6,7 @@ import motionmount
 from motionmount import MotionMountSystemError
 
 from homeassistant.components.sensor import SensorDeviceClass, SensorEntity
+from homeassistant.const import EntityCategory
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
@@ -47,6 +48,7 @@ class MotionMountErrorStatusSensor(MotionMountEntity, SensorEntity):
         "internal",
     ]
     _attr_translation_key = "motionmount_error_status"
+    _attr_entity_category = EntityCategory.DIAGNOSTIC
 
     def __init__(
         self, mm: motionmount.MotionMount, config_entry: MotionMountConfigEntry