diff --git a/pybotx/__init__.py b/pybotx/__init__.py
index 6dc75987..5ac50d3f 100644
--- a/pybotx/__init__.py
+++ b/pybotx/__init__.py
@@ -39,6 +39,7 @@
     ChatCreationError,
     ChatCreationProhibitedError,
     InvalidUsersListError,
+    ThreadAlreadyExistsError,
     ThreadCreationError,
     ThreadCreationProhibitedError,
 )
@@ -264,8 +265,8 @@
     "SyncSmartAppEventHandlerFunc",
     "SyncSmartAppEventHandlerNotFoundError",
     "SyncSourceTypes",
+    "ThreadAlreadyExistsError",
     "ThreadCreationError",
-    "ThreadCreationEventNotFoundError",
     "ThreadCreationProhibitedError",
     "UnknownBotAccountError",
     "UnknownSystemEventError",
diff --git a/pybotx/client/chats_api/create_thread.py b/pybotx/client/chats_api/create_thread.py
index f7370b41..d1c42146 100644
--- a/pybotx/client/chats_api/create_thread.py
+++ b/pybotx/client/chats_api/create_thread.py
@@ -1,9 +1,12 @@
-from typing import Literal
+from typing import Literal, NoReturn
 from uuid import UUID
 
+import httpx
+
 from pybotx.client.authorized_botx_method import AuthorizedBotXMethod
 from pybotx.client.botx_method import response_exception_thrower
 from pybotx.client.exceptions.chats import (
+    ThreadAlreadyExistsError,
     ThreadCreationError,
     ThreadCreationProhibitedError,
 )
@@ -31,12 +34,21 @@ def to_domain(self) -> UUID:
         return self.result.thread_id
 
 
+def conflict_error_handler(response: httpx.Response) -> NoReturn:
+    reason = response.json().get("reason")
+
+    if reason == "thread_already_created":
+        raise ThreadAlreadyExistsError.from_response(response)
+
+    raise ThreadCreationError.from_response(response)
+
+
 class CreateThreadMethod(AuthorizedBotXMethod):
     status_handlers = {
         **AuthorizedBotXMethod.status_handlers,
         403: response_exception_thrower(ThreadCreationProhibitedError),
         404: response_exception_thrower(EventNotFoundError),
-        422: response_exception_thrower(ThreadCreationError),
+        409: conflict_error_handler,
     }
 
     async def execute(
diff --git a/pybotx/client/exceptions/chats.py b/pybotx/client/exceptions/chats.py
index 50a2d3a1..e0b0480e 100644
--- a/pybotx/client/exceptions/chats.py
+++ b/pybotx/client/exceptions/chats.py
@@ -17,8 +17,12 @@ class ChatCreationError(BaseClientError):
     """Error while chat creation."""
 
 
+class ThreadAlreadyExistsError(BaseClientError):
+    """Thread is already exists."""
+
+
 class ThreadCreationError(BaseClientError):
-    """Error while thread creation (invalid scheme)."""
+    """Creating a thread for a deleted message."""
 
 
 class ThreadCreationProhibitedError(BaseClientError):
@@ -26,13 +30,11 @@ class ThreadCreationProhibitedError(BaseClientError):
     Error while permission checks.
 
     1. Bot has no permissions to create thread
-    2. Threads are not allowed for that message
+    2. Threads are not allowed for this chat
     3. Bot is not a chat member where message is located
     4. Message is located in personal chat
     5. Usupported event type
     6. Unsuppoerted chat type
-    7. Thread is already created
-    8. No access for message
-    9. Message in stealth mode
-    10. Message is deleted
+    7. No access for message
+    8. Message in stealth mode
     """
diff --git a/pyproject.toml b/pyproject.toml
index 3f77e707..e6a744fc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "pybotx"
-version = "0.75.4"
+version = "0.75.5"
 description = "A python library for interacting with eXpress BotX API"
 authors = [
     "Sidnev Nikolay <nsidnev@ccsteam.ru>",
diff --git a/tests/client/chats_api/test_create_thread.py b/tests/client/chats_api/test_create_thread.py
index bfb56fbd..5c719596 100644
--- a/tests/client/chats_api/test_create_thread.py
+++ b/tests/client/chats_api/test_create_thread.py
@@ -1,5 +1,6 @@
+from collections.abc import Callable
 from http import HTTPStatus
-from typing import Any, Callable
+from typing import Any
 from uuid import UUID
 
 import httpx
@@ -12,6 +13,7 @@
     BotAccountWithSecret,
     EventNotFoundError,
     HandlerCollector,
+    ThreadAlreadyExistsError,
     ThreadCreationError,
     ThreadCreationProhibitedError,
     lifespan_wrapper,
@@ -57,11 +59,10 @@ async def test__create_thread__succeed(
     bot_account: BotAccountWithSecret,
 ) -> None:
     # - Arrange -
-    thread_id = "2a8c0d1e-c4d1-4308-b024-6e1a9f4a4b6d"
     endpoint = create_mocked_endpoint(
         {
             "status": "ok",
-            "result": {"thread_id": thread_id},
+            "result": {"thread_id": sync_id},
         },
         HTTPStatus.OK,
     )
@@ -76,7 +77,7 @@ async def test__create_thread__succeed(
         )
 
     # - Assert -
-    assert str(created_thread_id) == thread_id
+    assert str(created_thread_id) == sync_id
     assert endpoint.called
 
 
@@ -143,16 +144,6 @@ async def test__create_thread__succeed(
             HTTPStatus.FORBIDDEN,
             ThreadCreationProhibitedError,
         ),
-        (
-            {
-                "status": "error",
-                "reason": "thread_already_created",
-                "errors": ["Thread already created"],
-                "error_data": {"bot_id": "24348246-6791-4ac0-9d86-b948cd6a0e46"},
-            },
-            HTTPStatus.FORBIDDEN,
-            ThreadCreationProhibitedError,
-        ),
         (
             {
                 "status": "error",
@@ -176,32 +167,32 @@ async def test__create_thread__succeed(
         (
             {
                 "status": "error",
-                "reason": "event_already_deleted",
-                "errors": ["This event already deleted"],
+                "reason": "event_not_found",
+                "errors": ["Event not found"],
                 "error_data": {"bot_id": "24348246-6791-4ac0-9d86-b948cd6a0e46"},
             },
-            HTTPStatus.FORBIDDEN,
-            ThreadCreationProhibitedError,
+            HTTPStatus.NOT_FOUND,
+            EventNotFoundError,
         ),
         (
             {
                 "status": "error",
-                "reason": "event_not_found",
-                "errors": ["Event not found"],
+                "reason": "event_already_deleted",
+                "errors": ["This event already deleted"],
                 "error_data": {"bot_id": "24348246-6791-4ac0-9d86-b948cd6a0e46"},
             },
-            HTTPStatus.NOT_FOUND,
-            EventNotFoundError,
+            HTTPStatus.CONFLICT,
+            ThreadCreationError,
         ),
         (
             {
                 "status": "error",
-                "reason": "|specified reason|",
-                "errors": ["|specified errors|"],
-                "error_data": {},
+                "reason": "thread_already_created",
+                "errors": ["Thread already created"],
+                "error_data": {"bot_id": "24348246-6791-4ac0-9d86-b948cd6a0e46"},
             },
-            HTTPStatus.UNPROCESSABLE_ENTITY,
-            ThreadCreationError,
+            HTTPStatus.CONFLICT,
+            ThreadAlreadyExistsError,
         ),
         (
             {