diff --git a/library/decort_account_info.py b/library/decort_account_info.py
index da2460e..27713b2 100644
--- a/library/decort_account_info.py
+++ b/library/decort_account_info.py
@@ -141,7 +141,7 @@ class DecortAccountInfo(DecortController):
                                 ),
                                 type=dict(
                                     type='str',
-                                    choices=['B', 'D'],
+                                    choices=self.DISK_TYPES,
                                 ),
                             ),
                         ),
diff --git a/module_utils/decort_utils.py b/module_utils/decort_utils.py
index ebbab55..f03709a 100644
--- a/module_utils/decort_utils.py
+++ b/module_utils/decort_utils.py
@@ -121,6 +121,8 @@ class DecortController(object):
         'STOPPING',
     ]
 
+    DISK_TYPES = ['B', 'D']
+
     RESOURCE_GROUP_STATUSES = [
         'CREATED',
         'DELETED',
@@ -2448,6 +2450,15 @@ class DecortController(object):
         `/cloudapi/account/listDisks`.
         """
 
+        if disk_type and (
+                not disk_type in self.DISK_TYPES
+                ):
+            self.result['msg'] = (
+                f'{disk_type} is not valid disk type'
+                f' for filtering account disk list.'
+                )
+            self.amodule.fail_json(**self.result)
+
         sort_by = None
         if sort_by_field:
             if not sort_by_field in self.FIELDS_FOR_SORTING_ACCOUNT_DISK_LIST: