diff --git a/homeassistant/components/bthome/device_trigger.py b/homeassistant/components/bthome/device_trigger.py
index c50ffc05900..4eca110e581 100644
--- a/homeassistant/components/bthome/device_trigger.py
+++ b/homeassistant/components/bthome/device_trigger.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 import voluptuous as vol
 
@@ -34,7 +34,7 @@ from .const import (
     EVENT_TYPE,
 )
 
-TRIGGERS_BY_EVENT_CLASS = {
+EVENT_TYPES_BY_EVENT_CLASS = {
     EVENT_CLASS_BUTTON: {
         "press",
         "double_press",
@@ -51,6 +51,38 @@ TRIGGER_SCHEMA = DEVICE_TRIGGER_BASE_SCHEMA.extend(
 )
 
 
+def get_event_classes_by_device_id(hass: HomeAssistant, device_id: str) -> list[str]:
+    """Get the supported event classes for a device.
+
+    Events for BTHome BLE devices are dynamically discovered
+    and stored in the device config entry when they are first seen.
+    """
+    device_registry = dr.async_get(hass)
+    device = device_registry.async_get(device_id)
+    if TYPE_CHECKING:
+        assert device is not None
+
+    config_entries = [
+        hass.config_entries.async_get_entry(entry_id)
+        for entry_id in device.config_entries
+    ]
+    bthome_config_entry = next(
+        entry for entry in config_entries if entry and entry.domain == DOMAIN
+    )
+    return bthome_config_entry.data.get(CONF_DISCOVERED_EVENT_CLASSES, [])
+
+
+def get_event_types_by_event_class(event_class: str) -> set[str]:
+    """Get the supported event types for an event class.
+
+    If the device has multiple buttons they will have
+    event classes like button_1 button_2, button_3, etc
+    but if there is only one button then it will be
+    button without a number postfix.
+    """
+    return EVENT_TYPES_BY_EVENT_CLASS.get(event_class.split("_")[0], set())
+
+
 async def async_validate_trigger_config(
     hass: HomeAssistant, config: ConfigType
 ) -> ConfigType:
@@ -58,31 +90,17 @@ async def async_validate_trigger_config(
     config = TRIGGER_SCHEMA(config)
     event_class = config[CONF_TYPE]
     event_type = config[CONF_SUBTYPE]
-
-    device_registry = dr.async_get(hass)
-    device = device_registry.async_get(config[CONF_DEVICE_ID])
-    assert device is not None
-    config_entries = [
-        hass.config_entries.async_get_entry(entry_id)
-        for entry_id in device.config_entries
-    ]
-    bthome_config_entry = next(
-        iter(entry for entry in config_entries if entry and entry.domain == DOMAIN)
-    )
-    event_classes: list[str] = bthome_config_entry.data.get(
-        CONF_DISCOVERED_EVENT_CLASSES, []
-    )
+    device_id = config[CONF_DEVICE_ID]
+    event_classes = get_event_classes_by_device_id(hass, device_id)
 
     if event_class not in event_classes:
         raise InvalidDeviceAutomationConfig(
-            f"BTHome trigger {event_class} is not valid for device "
-            f"{device} ({config[CONF_DEVICE_ID]})"
+            f"BTHome trigger {event_class} is not valid for device_id '{device_id}'"
         )
 
-    if event_type not in TRIGGERS_BY_EVENT_CLASS.get(event_class.split("_")[0], ()):
+    if event_type not in get_event_types_by_event_class(event_class):
         raise InvalidDeviceAutomationConfig(
-            f"BTHome trigger {event_type} is not valid for device "
-            f"{device} ({config[CONF_DEVICE_ID]})"
+            f"BTHome trigger {event_type} is not valid for device_id '{device_id}'"
         )
 
     return config
@@ -92,21 +110,7 @@ async def async_get_triggers(
     hass: HomeAssistant, device_id: str
 ) -> list[dict[str, Any]]:
     """Return a list of triggers for BTHome BLE devices."""
-    device_registry = dr.async_get(hass)
-    device = device_registry.async_get(device_id)
-    assert device is not None
-    config_entries = [
-        hass.config_entries.async_get_entry(entry_id)
-        for entry_id in device.config_entries
-    ]
-    bthome_config_entry = next(
-        iter(entry for entry in config_entries if entry and entry.domain == DOMAIN),
-        None,
-    )
-    assert bthome_config_entry is not None
-    event_classes: list[str] = bthome_config_entry.data.get(
-        CONF_DISCOVERED_EVENT_CLASSES, []
-    )
+    event_classes = get_event_classes_by_device_id(hass, device_id)
     return [
         {
             # Required fields of TRIGGER_BASE_SCHEMA
@@ -118,14 +122,7 @@ async def async_get_triggers(
             CONF_SUBTYPE: event_type,
         }
         for event_class in event_classes
-        for event_type in TRIGGERS_BY_EVENT_CLASS.get(
-            event_class.split("_")[0],
-            # If the device has multiple buttons they will have
-            # event classes like button_1 button_2, button_3, etc
-            # but if there is only one button then it will be
-            # button without a number postfix.
-            (),
-        )
+        for event_type in get_event_types_by_event_class(event_class)
     ]