diff --git a/nncf/telemetry/decorator.py b/nncf/telemetry/decorator.py
index 23ee56acc86..eba2be711fb 100644
--- a/nncf/telemetry/decorator.py
+++ b/nncf/telemetry/decorator.py
@@ -10,7 +10,7 @@
 # limitations under the License.
 import functools
 import inspect
-from typing import Callable, List, Union
+from typing import Any, Callable, List, Optional, TypeVar, Union
 
 from nncf.telemetry.events import MODEL_BASED_CATEGORY
 from nncf.telemetry.events import get_current_category
@@ -21,6 +21,8 @@
 from nncf.telemetry.extractors import VerbatimTelemetryExtractor
 from nncf.telemetry.wrapper import telemetry
 
+TFunction = TypeVar("TFunction", bound=Callable[..., Any])
+
 
 class tracked_function:
     """
@@ -29,7 +31,7 @@ class tracked_function:
     function execution. The category of the session and events will be determined by parameters to the decorator.
     """
 
-    def __init__(self, category: str = None, extractors: List[Union[str, TelemetryExtractor]] = None):
+    def __init__(self, category: str = None, extractors: Optional[List[Union[str, TelemetryExtractor]]] = None) -> None:
         """
         :param category: A category to be attributed to the events. If set to None, no events will be sent.
         :param extractors: Add argument names in this list as string values to send an event with an "action" equal to
@@ -44,11 +46,11 @@ def __init__(self, category: str = None, extractors: List[Union[str, TelemetryEx
         else:
             self._collectors = []
 
-    def __call__(self, fn: Callable) -> Callable:
+    def __call__(self, fn: TFunction) -> TFunction:
         fn_signature = inspect.signature(fn)
 
         @functools.wraps(fn)
-        def wrapped(*args, **kwargs):
+        def wrapped(*args: Any, **kwargs: Any) -> Any:
             bound_args = fn_signature.bind(*args, **kwargs)
             bound_args.apply_defaults()
 
@@ -59,7 +61,7 @@ def wrapped(*args, **kwargs):
             events: List[CollectedEvent] = []
             for collector in self._collectors:
                 argname = collector.argname
-                argvalue = bound_args.arguments[argname] if argname is not None else None
+                argvalue = bound_args.arguments[argname] if argname else None
                 event = collector.extract(argvalue)
                 events.append(event)
 
@@ -82,4 +84,4 @@ def wrapped(*args, **kwargs):
                     telemetry.end_session(self._category)
             return retval
 
-        return wrapped
+        return wrapped  # type: ignore[return-value]
diff --git a/nncf/telemetry/events.py b/nncf/telemetry/events.py
index a048fbbb0c7..b0966a5c77c 100644
--- a/nncf/telemetry/events.py
+++ b/nncf/telemetry/events.py
@@ -10,7 +10,7 @@
 # limitations under the License.
 
 from contextlib import contextmanager
-from typing import Optional, TypeVar
+from typing import Generator, Optional, TypeVar
 
 from nncf.common.utils.backend import BackendType
 from nncf.common.utils.backend import get_backend
@@ -25,12 +25,12 @@
 # Dynamic categories
 MODEL_BASED_CATEGORY = "model_based"
 
-CURRENT_CATEGORY = None
+CURRENT_CATEGORY: Optional[str] = None
 
 TModel = TypeVar("TModel")
 
 
-def _set_current_category(category: str):
+def _set_current_category(category: Optional[str]) -> None:
     global CURRENT_CATEGORY
     CURRENT_CATEGORY = category
 
@@ -56,7 +56,7 @@ def get_model_based_category(model: TModel) -> str:
 
 
 @contextmanager
-def telemetry_category(category: str) -> str:
+def telemetry_category(category: Optional[str]) -> Generator[Optional[str], None, None]:
     previous_category = get_current_category()
     _set_current_category(category)
     yield category
diff --git a/nncf/telemetry/extractors.py b/nncf/telemetry/extractors.py
index a06d8f8daa5..624b0b1f26a 100644
--- a/nncf/telemetry/extractors.py
+++ b/nncf/telemetry/extractors.py
@@ -14,7 +14,7 @@
 from enum import Enum
 from typing import Any, Optional, Union
 
-SerializableData = Union[str, Enum]
+SerializableData = Union[str, Enum, bool]
 
 
 @dataclass
@@ -26,8 +26,8 @@ class CollectedEvent:
     """
 
     name: str
-    data: SerializableData = None  # GA limitations
-    int_data: int = None
+    data: Optional[SerializableData] = None  # GA limitations
+    int_data: Optional[int] = None
 
 
 class TelemetryExtractor(ABC):
@@ -35,7 +35,7 @@ class TelemetryExtractor(ABC):
     Interface for custom telemetry extractors, to be used with the `nncf.telemetry.tracked_function` decorator.
     """
 
-    def __init__(self, argname: Optional[str] = None):
+    def __init__(self, argname: str = ""):
         self._argname = argname
 
     @property
diff --git a/nncf/telemetry/wrapper.py b/nncf/telemetry/wrapper.py
index 2cc32af0158..eb150c3e1ee 100644
--- a/nncf/telemetry/wrapper.py
+++ b/nncf/telemetry/wrapper.py
@@ -13,7 +13,7 @@
 import sys
 from abc import ABC
 from abc import abstractmethod
-from typing import Callable, Optional
+from typing import Any, Callable, Optional
 from unittest.mock import MagicMock
 
 from nncf.common.logging import nncf_logger
@@ -29,7 +29,7 @@ class ITelemetry(ABC):
     # https://support.google.com/analytics/answer/1033068
 
     @abstractmethod
-    def start_session(self, category: str, **kwargs):
+    def start_session(self, category: str, **kwargs: Any) -> None:
         """
         Sends a message about starting of a new session.
 
@@ -45,9 +45,9 @@ def send_event(
         event_action: str,
         event_label: str,
         event_value: Optional[int] = None,
-        force_send=False,
-        **kwargs,
-    ):
+        force_send: bool = False,
+        **kwargs: Any,
+    ) -> None:
         """
         Send single event.
 
@@ -61,7 +61,7 @@ def send_event(
         """
 
     @abstractmethod
-    def end_session(self, category: str, **kwargs):
+    def end_session(self, category: str, **kwargs: Any) -> None:
         """
         Sends a message about ending of the current session.
 
@@ -78,7 +78,7 @@ def skip_if_raised(func: Callable[..., None]) -> Callable[..., None]:
     """
 
     @functools.wraps(func)
-    def wrapped(*args, **kwargs):
+    def wrapped(*args: Any, **kwargs: Any) -> None:
         try:
             func(*args, **kwargs)
 
@@ -91,7 +91,7 @@ def wrapped(*args, **kwargs):
 class NNCFTelemetry(ITelemetry):
     MEASUREMENT_ID = "G-W5E9RNLD4H"
 
-    def __init__(self):
+    def __init__(self) -> None:
         self._app_name = "nncf"
         self._app_version = __version__
         try:
@@ -108,7 +108,7 @@ def __init__(self):
             nncf_logger.debug(f"Failed to instantiate telemetry object: exception {e}")
 
     @skip_if_raised
-    def start_session(self, category: str, **kwargs):
+    def start_session(self, category: str, **kwargs: Any) -> None:
         self._impl.start_session(category, **kwargs)
 
     @skip_if_raised
@@ -118,9 +118,9 @@ def send_event(
         event_action: str,
         event_label: str,
         event_value: Optional[int] = None,
-        force_send=False,
-        **kwargs,
-    ):
+        force_send: bool = False,
+        **kwargs: Any,
+    ) -> None:
         if event_value is None:
             event_value = 1
         self._impl.send_event(
@@ -135,12 +135,12 @@ def send_event(
         )
 
     @skip_if_raised
-    def end_session(self, category: str, **kwargs):
+    def end_session(self, category: str, **kwargs: Any) -> None:
         self._impl.end_session(category, **kwargs)
 
 
 try:
-    from openvino_telemetry import Telemetry
+    from openvino_telemetry import Telemetry  # type: ignore
 
     telemetry = NNCFTelemetry()
 except ImportError:
diff --git a/pyproject.toml b/pyproject.toml
index eb6067af2c9..45344934e07 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -100,6 +100,7 @@ files = [
     "nncf/common/utils/",
     "nncf/common/tensor_statistics",
     "nncf/experimental/torch2",
+    "nncf/telemetry/",
 ]
 
 [tool.ruff]