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
Enter the first three characters from a member’s current Blue Cross Blue Shield ID card. Find the BlueCard home plan, state, payer ID, and published claim-status and eligibility routes.
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.
BlueCard reference
What a BCBS prefix tells you
A member may carry a Blue plan from another state. The three-character prefix points to the home plan that owns the member relationship and adjudicates the claim—not necessarily the local plan where care was delivered.
Use the current member ID card, then confirm transaction routing with the resolved terminal payer or clearinghouse before submission.
Common questions
BCBS prefix lookup FAQ
What is a BCBS prefix?
A BCBS prefix is the first three characters on a member ID card. It identifies the BlueCard home plan responsible for the member's benefits and claim adjudication.
How do I look up a BCBS prefix?
Enter the three-character prefix exactly as it appears on the member's current ID card. The directory returns the home plan, state, terminal payer, trading partner service ID, and published transaction routes.
Does a BCBS prefix identify the local plan?
Not necessarily. The prefix identifies the member's home plan, which can differ from the local Blue Cross Blue Shield plan where care was delivered.