need help...we want to order an HSG to test tubal patency after methtrexate use for an tubal pregnancy. We are having a disagreement on what code to use. Some want to use the tubal pregnancy code (633.10) while others believe that we should not be using that code since it has been 2 months and she is no longer pregnant due to the methotrexate injection. However, we can not find a code for just tubal patency. Any help would greatly be appreciated. Thanks.