diff --git a/azure-mgmt-billing/azure/mgmt/billing/operations/billing_accounts_operations.py b/azure-mgmt-billing/azure/mgmt/billing/operations/billing_accounts_operations.py
index e2df4e98e87d..01bf9dceb4a0 100644
--- a/azure-mgmt-billing/azure/mgmt/billing/operations/billing_accounts_operations.py
+++ b/azure-mgmt-billing/azure/mgmt/billing/operations/billing_accounts_operations.py
@@ -11,6 +11,8 @@
 
 import uuid
 from msrest.pipeline import ClientRawResponse
+from msrest.polling import LROPoller, NoPolling
+from msrestazure.polling.arm_polling import ARMPolling
 
 from .. import models
 
@@ -153,3 +155,109 @@ def get(
 
         return deserialized
     get.metadata = {'url': '/providers/Microsoft.Billing/billingAccounts/{billingAccountName}'}
+
+
+    def _update_initial(
+            self, billing_account_name, parameters, custom_headers=None, raw=False, **operation_config):
+        # Construct URL
+        url = self.update.metadata['url']
+        path_format_arguments = {
+            'billingAccountName': self._serialize.url("billing_account_name", billing_account_name, 'str')
+        }
+        url = self._client.format_url(url, **path_format_arguments)
+
+        # Construct parameters
+        query_parameters = {}
+        query_parameters['api-version'] = self._serialize.query("self.api_version", self.api_version, 'str')
+
+        # Construct headers
+        header_parameters = {}
+        header_parameters['Accept'] = 'application/json'
+        header_parameters['Content-Type'] = 'application/json; charset=utf-8'
+        if self.config.generate_client_request_id:
+            header_parameters['x-ms-client-request-id'] = str(uuid.uuid1())
+        if custom_headers:
+            header_parameters.update(custom_headers)
+        if self.config.accept_language is not None:
+            header_parameters['accept-language'] = self._serialize.header("self.config.accept_language", self.config.accept_language, 'str')
+
+        # Construct body
+        body_content = self._serialize.body(parameters, 'BillingAccount')
+
+        # Construct and send request
+        request = self._client.patch(url, query_parameters, header_parameters, body_content)
+        response = self._client.send(request, stream=False, **operation_config)
+
+        if response.status_code not in [200, 202]:
+            raise models.ErrorResponseException(self._deserialize, response)
+
+        deserialized = None
+        header_dict = {}
+
+        if response.status_code == 200:
+            deserialized = self._deserialize('BillingAccount', response)
+            header_dict = {
+                'Location': 'str',
+                'Retry-After': 'str',
+            }
+
+        if raw:
+            client_raw_response = ClientRawResponse(deserialized, response)
+            client_raw_response.add_headers(header_dict)
+            return client_raw_response
+
+        return deserialized
+
+    def update(
+            self, billing_account_name, parameters, custom_headers=None, raw=False, polling=True, **operation_config):
+        """The operation to update a billing account.
+
+        :param billing_account_name: billing Account Id.
+        :type billing_account_name: str
+        :param parameters: Parameters supplied to the update billing account
+         operation.
+        :type parameters: ~azure.mgmt.billing.models.BillingAccount
+        :param dict custom_headers: headers that will be added to the request
+        :param bool raw: The poller return type is ClientRawResponse, the
+         direct response alongside the deserialized response
+        :param polling: True for ARMPolling, False for no polling, or a
+         polling object for personal polling strategy
+        :return: An instance of LROPoller that returns BillingAccount or
+         ClientRawResponse<BillingAccount> if raw==True
+        :rtype:
+         ~msrestazure.azure_operation.AzureOperationPoller[~azure.mgmt.billing.models.BillingAccount]
+         or
+         ~msrestazure.azure_operation.AzureOperationPoller[~msrest.pipeline.ClientRawResponse[~azure.mgmt.billing.models.BillingAccount]]
+        :raises:
+         :class:`ErrorResponseException<azure.mgmt.billing.models.ErrorResponseException>`
+        """
+        raw_result = self._update_initial(
+            billing_account_name=billing_account_name,
+            parameters=parameters,
+            custom_headers=custom_headers,
+            raw=True,
+            **operation_config
+        )
+
+        def get_long_running_output(response):
+            header_dict = {
+                'Location': 'str',
+                'Retry-After': 'str',
+            }
+            deserialized = self._deserialize('BillingAccount', response)
+
+            if raw:
+                client_raw_response = ClientRawResponse(deserialized, response)
+                client_raw_response.add_headers(header_dict)
+                return client_raw_response
+
+            return deserialized
+
+        lro_delay = operation_config.get(
+            'long_running_operation_timeout',
+            self.config.long_running_operation_timeout)
+        if polling is True: polling_method = ARMPolling(lro_delay, **operation_config)
+        elif polling is False: polling_method = NoPolling()
+        else: polling_method = polling
+        return LROPoller(self._client, raw_result, get_long_running_output, polling_method)
+    update.metadata = {'url': '/providers/Microsoft.Billing/billingAccounts/{billingAccountName}'}