BCBS is one of the biggest insurance companies in USA and serving more than 106 million people. To run such a large number of people, they divided Blue Cross Blue Shield Insurance Association into different departments which is employer specific or state wise.
Website : https://bcbsprefix.com/

To identify correct blue cross blue shield department, they use three characters BCBS prefix in the start of each BCBS member plan ID. Below in our BCBS prefix lookup directory, you can lookup all the BCBS prefix appropriate home plans and their contact information..