Paul... i upload to Gateway EDI, and have to reenter visit codes in my old PM software in order to generate an 837 that works. AC will not generate 837's acceptable to Office Ally either...I've tried both. Tech support at both clearing houses state that AC is unwilling to cooperate because the problems are "hard-coded" into AC. They involve the use of legacy numbers in the claims and a couple other issues. The option to generate AC claims in an "Office Ally" format is useless at this point. Office Ally suggested an option to open the claims batch in an Excel template and modify entries and fields, etc,etc,etc. and try again. We just do not have the time to learn programming. Gateway EDI states that AC will not cooperate in making claims creation work with them, so they simply recommend not using AC or finding another clearing house. I have pondered whether AC is using this to push it's own ripoff billing service. Good med records program, but that is all AC is at this point.