Read the card
Use the prefix from the member’s current ID card. Never borrow or infer one from another member.
BlueCard routing directory
BCBS prefix lookup
Turn the first three characters on a member ID card into the home plan and terminal trading partner your RCM team actually needs.
For billing teams
Route the member, not the local plan.
Find the home plan
The prefix identifies the BlueCard home plan that owns eligibility and claim adjudication.
Use the terminal payer
Copy the trading partner ID or open the payer summary to confirm available claim-status and eligibility routes.