BCBS Quick Reference Guides

2026 update: RAA–RZZ prefix reference Reviewed October 26, 2026. The original 2025 directory is retained below as a historical reference. This update verifies the specific changes cited here; it does not certify every historical prefix assignment for 2026. Use the…

2026 update: XAA–XZZ prefix reference Reviewed October 26, 2026. The original 2025 directory is retained below as a historical reference. This update verifies the specific changes cited here; it does not certify every historical prefix assignment for 2026. Use the…