Check this link right here http://www.whatismedicalinsurancebilling.org/2010/06/bcbs-alpha-prefix-list-and-claim.html for more information on BLUE CROSS BLUE SHIELD PREFIX LIST. Most BCBS-branded ID cards display a three-character alpha prefix in the first three positions of the member’s ID number. However, there are some exceptions. ID cards for the following products and programs do not have an alpha prefix. The alpha prefix is critical for inquiries regarding the member, including eligibility and benefits, and is necessary for proper claim filing.
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