Try this site http://www.whatismedicalinsurancebilling.org/2010/06/bcbs-alpha-prefix-list-and-claim.html for more information on BCBS alpha prefix list. The prefixes identify the participant's BCBS prefix list plan or nationwide account as well as come to be essential when directing insurance claims for handling. In plan-specific alpha prefixes, the first two characters signify an offered strategy, while the third personality determines the product type picked by the member, explains the BCBS of Texas. For example, the" Z" and "G" in the prefix "ZGP" are BCBS-assigned letters, and also the" P" represents a recommended supplier company, or PPO, item.