diff --git a/moto/iam/exceptions.py b/moto/iam/exceptions.py
index f63ad477..b4d89c0f 100644
--- a/moto/iam/exceptions.py
+++ b/moto/iam/exceptions.py
@@ -13,9 +13,9 @@ class IAMNotFoundException(RESTError):
 class IAMConflictException(RESTError):
     code = 409
 
-    def __init__(self, message):
+    def __init__(self, code='Conflict', message=""):
         super(IAMConflictException, self).__init__(
-            "Conflict", message)
+            code, message)
 
 
 class IAMReportNotPresentException(RESTError):
diff --git a/moto/iam/models.py b/moto/iam/models.py
index f6864b7c..05e44095 100644
--- a/moto/iam/models.py
+++ b/moto/iam/models.py
@@ -344,7 +344,7 @@ class IAMBackend(BaseBackend):
 
     def create_user(self, user_name, path='/'):
         if user_name in self.users:
-            raise IAMConflictException("User {0} already exists".format(user_name))
+            raise IAMConflictException("EntityAlreadyExists", "User {0} already exists".format(user_name))
 
         user = User(user_name, path)
         self.users[user_name] = user