BlueCard® Three–Character Prefixes

The three-character prefix at the beginning of the member’s identification number is the key element used to identify and correctly route out-of-state claims to the appropriate BCBS Plan. The three-character prefix identifies the Blue Cross and Blue Shield Plan to which the member belongs. Some member’s ID cards may not have an alpha prefix. Please look for claim filing instructions on the back of the ID card.

Please DO NOT randomly select a three-character prefix. An incorrect or missing three-character prefix may cause possible delays in the processing of your claims. Complete patient information, on the other hand, allows your claims to process without delays. Member identification numbers beginning with “R” belong to Federal Employee Program (FEP) and will not have a three-character prefix when filing.

To identify the plan that holds the members benefits, please call the Out-of-State Blues Plan Subscriber #: 1-800-676-BLUE (2583).

Also, pre-authorization information and medical policy for out of state plans may be found on the Blue Cross Blue Shield of Texas provider website section under Standards and Requirements, and then select "Medical Policy and Precertification/Preauthorization for Out of Area Members."