diff --git a/homeassistant/components/isy994/binary_sensor.py b/homeassistant/components/isy994/binary_sensor.py
index da12ebd3ef8..828688c3429 100644
--- a/homeassistant/components/isy994/binary_sensor.py
+++ b/homeassistant/components/isy994/binary_sensor.py
@@ -45,7 +45,6 @@ from .const import (
     TYPE_INSTEON_MOTION,
 )
 from .entity import ISYNodeEntity, ISYProgramEntity
-from .helpers import migrate_old_unique_ids
 
 DEVICE_PARENT_REQUIRED = [
     BinarySensorDeviceClass.OPENING,
@@ -191,7 +190,6 @@ async def async_setup_entry(
     for name, status, _ in hass_isy_data[ISY994_PROGRAMS][Platform.BINARY_SENSOR]:
         entities.append(ISYBinarySensorProgramEntity(name, status))
 
-    await migrate_old_unique_ids(hass, Platform.BINARY_SENSOR, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/climate.py b/homeassistant/components/isy994/climate.py
index 44d64c05be7..612d411245f 100644
--- a/homeassistant/components/isy994/climate.py
+++ b/homeassistant/components/isy994/climate.py
@@ -54,7 +54,7 @@ from .const import (
     UOM_TO_STATES,
 )
 from .entity import ISYNodeEntity
-from .helpers import convert_isy_value_to_hass, migrate_old_unique_ids
+from .helpers import convert_isy_value_to_hass
 
 
 async def async_setup_entry(
@@ -67,7 +67,6 @@ async def async_setup_entry(
     for node in hass_isy_data[ISY994_NODES][Platform.CLIMATE]:
         entities.append(ISYThermostatEntity(node))
 
-    await migrate_old_unique_ids(hass, Platform.CLIMATE, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/cover.py b/homeassistant/components/isy994/cover.py
index e7d3349958c..de97581dfef 100644
--- a/homeassistant/components/isy994/cover.py
+++ b/homeassistant/components/isy994/cover.py
@@ -24,7 +24,6 @@ from .const import (
     UOM_BARRIER,
 )
 from .entity import ISYNodeEntity, ISYProgramEntity
-from .helpers import migrate_old_unique_ids
 
 
 async def async_setup_entry(
@@ -39,7 +38,6 @@ async def async_setup_entry(
     for name, status, actions in hass_isy_data[ISY994_PROGRAMS][Platform.COVER]:
         entities.append(ISYCoverProgramEntity(name, status, actions))
 
-    await migrate_old_unique_ids(hass, Platform.COVER, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/entity.py b/homeassistant/components/isy994/entity.py
index 144ec016d22..1dc60ef9664 100644
--- a/homeassistant/components/isy994/entity.py
+++ b/homeassistant/components/isy994/entity.py
@@ -1,7 +1,7 @@
 """Representation of ISYEntity Types."""
 from __future__ import annotations
 
-from typing import Any, cast
+from typing import Any
 
 from pyisy.constants import (
     COMMAND_FRIENDLY_NAME,
@@ -130,13 +130,6 @@ class ISYEntity(Entity):
             return f"{self._node.isy.configuration[ISY_CONF_UUID]}_{self._node.address}"
         return None
 
-    @property
-    def old_unique_id(self) -> str | None:
-        """Get the old unique identifier of the device."""
-        if hasattr(self._node, "address"):
-            return cast(str, self._node.address)
-        return None
-
     @property
     def name(self) -> str:
         """Get the name of the device."""
diff --git a/homeassistant/components/isy994/fan.py b/homeassistant/components/isy994/fan.py
index 5fd14927322..1ff7d9f7961 100644
--- a/homeassistant/components/isy994/fan.py
+++ b/homeassistant/components/isy994/fan.py
@@ -19,7 +19,6 @@ from homeassistant.util.percentage import (
 
 from .const import _LOGGER, DOMAIN as ISY994_DOMAIN, ISY994_NODES, ISY994_PROGRAMS
 from .entity import ISYNodeEntity, ISYProgramEntity
-from .helpers import migrate_old_unique_ids
 
 SPEED_RANGE = (1, 255)  # off is not included
 
@@ -37,7 +36,6 @@ async def async_setup_entry(
     for name, status, actions in hass_isy_data[ISY994_PROGRAMS][Platform.FAN]:
         entities.append(ISYFanProgramEntity(name, status, actions))
 
-    await migrate_old_unique_ids(hass, Platform.FAN, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/helpers.py b/homeassistant/components/isy994/helpers.py
index cc602a49777..42c0c60120f 100644
--- a/homeassistant/components/isy994/helpers.py
+++ b/homeassistant/components/isy994/helpers.py
@@ -1,8 +1,7 @@
 """Sorting helpers for ISY device classifications."""
 from __future__ import annotations
 
-from collections.abc import Sequence
-from typing import TYPE_CHECKING, cast
+from typing import cast
 
 from pyisy.constants import (
     ISY_VALUE_UNKNOWN,
@@ -17,13 +16,10 @@ from pyisy.programs import Programs
 from pyisy.variables import Variables
 
 from homeassistant.const import Platform
-from homeassistant.core import HomeAssistant
-from homeassistant.helpers import entity_registry as er
 
 from .const import (
     _LOGGER,
     DEFAULT_PROGRAM_STRING,
-    DOMAIN,
     FILTER_INSTEON_TYPE,
     FILTER_NODE_DEF_ID,
     FILTER_STATES,
@@ -50,9 +46,6 @@ from .const import (
     UOM_ISYV4_DEGREES,
 )
 
-if TYPE_CHECKING:
-    from .entity import ISYEntity
-
 BINARY_SENSOR_UOMS = ["2", "78"]
 BINARY_SENSOR_ISY_STATES = ["on", "off"]
 
@@ -381,40 +374,6 @@ def _categorize_variables(
         variable_entities[Platform.SENSOR].append((vname, variables[vtype][vid]))
 
 
-async def migrate_old_unique_ids(
-    hass: HomeAssistant, platform: str, entities: Sequence[ISYEntity]
-) -> None:
-    """Migrate to new controller-specific unique ids."""
-    registry = er.async_get(hass)
-
-    for entity in entities:
-        if entity.old_unique_id is None or entity.unique_id is None:
-            continue
-        old_entity_id = registry.async_get_entity_id(
-            platform, DOMAIN, entity.old_unique_id
-        )
-        if old_entity_id is not None:
-            _LOGGER.debug(
-                "Migrating unique_id from [%s] to [%s]",
-                entity.old_unique_id,
-                entity.unique_id,
-            )
-            registry.async_update_entity(old_entity_id, new_unique_id=entity.unique_id)
-
-        old_entity_id_2 = registry.async_get_entity_id(
-            platform, DOMAIN, entity.unique_id.replace(":", "")
-        )
-        if old_entity_id_2 is not None:
-            _LOGGER.debug(
-                "Migrating unique_id from [%s] to [%s]",
-                entity.unique_id.replace(":", ""),
-                entity.unique_id,
-            )
-            registry.async_update_entity(
-                old_entity_id_2, new_unique_id=entity.unique_id
-            )
-
-
 def convert_isy_value_to_hass(
     value: int | float | None,
     uom: str | None,
diff --git a/homeassistant/components/isy994/light.py b/homeassistant/components/isy994/light.py
index 92cfb452969..ed13b8c94f4 100644
--- a/homeassistant/components/isy994/light.py
+++ b/homeassistant/components/isy994/light.py
@@ -22,7 +22,6 @@ from .const import (
     UOM_PERCENTAGE,
 )
 from .entity import ISYNodeEntity
-from .helpers import migrate_old_unique_ids
 from .services import async_setup_light_services
 
 ATTR_LAST_BRIGHTNESS = "last_brightness"
@@ -40,7 +39,6 @@ async def async_setup_entry(
     for node in hass_isy_data[ISY994_NODES][Platform.LIGHT]:
         entities.append(ISYLightEntity(node, restore_light_state))
 
-    await migrate_old_unique_ids(hass, Platform.LIGHT, entities)
     async_add_entities(entities)
     async_setup_light_services(hass)
 
diff --git a/homeassistant/components/isy994/lock.py b/homeassistant/components/isy994/lock.py
index 1101eebd632..8fa271a50d0 100644
--- a/homeassistant/components/isy994/lock.py
+++ b/homeassistant/components/isy994/lock.py
@@ -13,7 +13,6 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import _LOGGER, DOMAIN as ISY994_DOMAIN, ISY994_NODES, ISY994_PROGRAMS
 from .entity import ISYNodeEntity, ISYProgramEntity
-from .helpers import migrate_old_unique_ids
 
 VALUE_TO_STATE = {0: False, 100: True}
 
@@ -30,7 +29,6 @@ async def async_setup_entry(
     for name, status, actions in hass_isy_data[ISY994_PROGRAMS][Platform.LOCK]:
         entities.append(ISYLockProgramEntity(name, status, actions))
 
-    await migrate_old_unique_ids(hass, Platform.LOCK, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/sensor.py b/homeassistant/components/isy994/sensor.py
index e3e812d1b26..635b456da25 100644
--- a/homeassistant/components/isy994/sensor.py
+++ b/homeassistant/components/isy994/sensor.py
@@ -45,7 +45,7 @@ from .const import (
     UOM_TO_STATES,
 )
 from .entity import ISYEntity, ISYNodeEntity
-from .helpers import convert_isy_value_to_hass, migrate_old_unique_ids
+from .helpers import convert_isy_value_to_hass
 
 # Disable general purpose and redundant sensors by default
 AUX_DISABLED_BY_DEFAULT_MATCH = ["GV", "DO"]
@@ -135,7 +135,6 @@ async def async_setup_entry(
     for vname, vobj in hass_isy_data[ISY994_VARIABLES][Platform.SENSOR]:
         entities.append(ISYSensorVariableEntity(vname, vobj))
 
-    await migrate_old_unique_ids(hass, Platform.SENSOR, entities)
     async_add_entities(entities)
 
 
diff --git a/homeassistant/components/isy994/switch.py b/homeassistant/components/isy994/switch.py
index a637f4f632a..10c23c3c434 100644
--- a/homeassistant/components/isy994/switch.py
+++ b/homeassistant/components/isy994/switch.py
@@ -13,7 +13,6 @@ from homeassistant.helpers.entity_platform import AddEntitiesCallback
 
 from .const import _LOGGER, DOMAIN as ISY994_DOMAIN, ISY994_NODES, ISY994_PROGRAMS
 from .entity import ISYNodeEntity, ISYProgramEntity
-from .helpers import migrate_old_unique_ids
 
 
 async def async_setup_entry(
@@ -28,7 +27,6 @@ async def async_setup_entry(
     for name, status, actions in hass_isy_data[ISY994_PROGRAMS][Platform.SWITCH]:
         entities.append(ISYSwitchProgramEntity(name, status, actions))
 
-    await migrate_old_unique_ids(hass, Platform.SWITCH, entities)
     async_add_entities(entities)