diff --git a/arztapi/APIHandler.py b/arztapi/APIHandler.py
index c567c79..dae758a 100644
--- a/arztapi/APIHandler.py
+++ b/arztapi/APIHandler.py
@@ -63,6 +63,15 @@ class APIHandler:
     def get_list_of_doctors(self, lat, lon, req_val_base64, therapy_types, therapy_age, therapy_setting,
                             amount_of_weeks) -> ArztPraxisDatas:
 
+        # Use the selected therapy types in case of "Verhaltenstherapie" -> most data used for it, might overload the
+        # request, so other therapy types are missing
+        if "V" in therapy_types:
+            selected_codes = therapy_types
+
+        # Collect all three other therapy types in case of missing V
+        else:
+            selected_codes = ["A", "S", "T"]
+
         # Data object as built by the original website, some fields might not be plausible or known (since there is no
         # API documentation itself available
         self.json_data = {
@@ -81,7 +90,7 @@ class APIHandler:
                 {
                     "title": "Psychotherapie: Verfahren",
                     "fieldName": "ptv",
-                    "selectedCodes": therapy_types,
+                    "selectedCodes": selected_codes
                 },
                 {
                     "title": "Psychotherapie: Altersgruppe",
@@ -115,6 +124,9 @@ class APIHandler:
             self.get_list_of_doctors_from_api(lat, lon, req_val_base64, therapy_types, therapy_age, therapy_setting)
             self.set_current_doctor_information_data_in_cache()
 
+        # Filter for the relevant therapy times before processing
+        self.filter_for_therapy_types(therapy_types)
+
     def get_list_of_doctors_from_api(self, lat, lon, req_val_base64, therapy_types, therapy_age,
                                      therapy_setting) -> ArztPraxisDatas:
         """
@@ -140,8 +152,6 @@ class APIHandler:
             "req-val": req_val_base64,
         }
 
-
-
         response = requests.post(api_path, headers=headers, json=self.json_data)
         # Check for HTTP errors
         response.raise_for_status()
@@ -163,6 +173,37 @@ class APIHandler:
         current_date = datetime.now()
         self._cache[str(self.json_data)] = {"timestamp": current_date, "data": self.phone_times}
 
+    def filter_for_therapy_types(self, therapy_types):
+        """
+        The idea is to get as much data as possible from the API at once to minimize the number of API calls.
+        For some cases, more data than actually necessary is cached and this is a filter for it.
+        :param therapy_types: Desired therapy types
+        :return:
+        """
+
+        # Mapping of the selected codes to the actual therapy type
+        mapping = {
+            "V": "Verhaltenstherapie",
+            "T": "Tiefenpsychologisch fundierte Psychotherapie",
+            "A": "Analytische Psychotherapie",
+            "S": "Systemische Therapie"
+        }
+
+        # Store relevant phone times
+        relevant_phone_times = []
+
+        for data in self.phone_times.arztPraxisDatas:
+            # Relevant therapy type stored in psy
+            settings = data.psy
+            # Multiple therapy types might be available
+            for setting in settings:
+                # Check if the therapy type which is desired is available
+                if any(mapping[code] in setting for code in therapy_types):
+                    relevant_phone_times.append(data)
+
+        # Update with relevant phone times
+        self.phone_times.arztPraxisDatas = relevant_phone_times
+
     def get_general_doctor_information(self) -> List[DoctorInformation]:
         """
         Transform and filter data to more usable format: Check for phone times and collect general doctor information
diff --git a/arztapi/ArztPraxisDatas.py b/arztapi/ArztPraxisDatas.py
index d635c12..82dd467 100644
--- a/arztapi/ArztPraxisDatas.py
+++ b/arztapi/ArztPraxisDatas.py
@@ -45,6 +45,7 @@ class ArztPraxisData(BaseModel):
     keineSprechzeiten: bool
     ag: List[Ag]
     tsz: List[Tsz]
+    psy: List[str]
 
 
 class ArztPraxisDatas(BaseModel):