The txx bcbs prefix is a three-character code used by Blue Cross Blue Shield (BCBS) insurance plans to identify the member's plan and network. The prefix is followed by a unique member identification number, and it is important to provide this information when seeking medical services to ensure accurate billing and coverage. BCBS is a nationwide network of independent healthcare organizations that provide coverage to over 100 million individuals in the United States, and the TXX prefix is just one of the many identification codes used by the network.