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Reference Menu Follow x12standards X12 Members List Alphabetized listing of current X12 members organizations. Membership Benefits Join other member organizations in continuously adapting the expansive vocabulary and languageused by millions of organizationswhileleveraging more than 40 years of crossindustry standards development knowledge. Membership Categories Membership categories and associated dues are based on the size and type of organization or individual as well as the committee you intend to participate with. Membership Application To apply for an X12 membership complete and submit an application form which will be reviewed and verified then you will be notified of the next steps.