Also found in: Medical, Financial.


The American equivalent of UN/EDIFACT and various other national and industry EDI messaging protocols. The first Y2K ready version of X.12 is version 4010.

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Also known as "ANSI X12" and "ASC X12," it is a protocol from the American National Standards Institute (ANSI) for electronic data interchange (EDI). X12 was the primary North American standard for defining EDI transactions. It merged with EDIFACT in 1997. See EDI.
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