Changes to the Three-Character Prefix on Member ID Cards
Posted March 25, 2019
Blue Cross and Blue Shield member ID numbers usually begin with a three-character prefix. Prior to April 2018, the prefixes included letters only. To ensure there are enough prefixes to support current and future business needs, the prefixes may now be alphanumeric.
- If a Blue Cross and Blue Shield member’s ID number does not have a three-character prefix, make sure you request their most current identification card.
- Three-character member ID prefixes may now have both letters and numbers.
- Member ID cards that have letters-only prefixes are still valid.
- The three-character prefix is always followed by the rest of the member’s ID number.
- Include the entire member ID number, with the prefix, on all correspondence and claims.
- Do not omit, randomly select or substitute a different three-character prefix.
- Some Blue Cross and Blue Shield member ID prefixes may have less than three characters. Federal Employee Program® (FEP®) members, for example, have a single-letter prefix.