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What is a companion guide and how can I get one?
Answer:
The companion guide is specific to a client (BCBSNC, AETNAGA, UPS Etc) and implementation Guide is a standard guide like 837, 835 Implementation guides.
Every client prepares their own companion guides with the help of Implementation Guide, with this companion guide System Analysts, Developers, Architects works to develop their system to integrate the EDI Transaction flow.