You are right , it should be AC not AZ.When you say AC central , do you mean the tech support ? I asked one of the people from tech support, he did not have any knowledge about the format.So when I use Offce Ally, even if AC generates a CMS 1500 form automatically, I have still mechanically enter the ICD/CPT codes into Office Ally or is there a way to tranfer the data automatically into Office ally and then bill it.