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BlueCard® Alpha Prefixes

The 3-character alpha 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 alpha 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 an alpha prefix. An incorrect or missing alpha 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.