I5M BCBS Prefix

Billing a patient with a I5M member ID

1. 1

   Verify eligibility through Unallocated/Not Assigned or the BlueCard eligibility line before the visit — coverage and benefits are governed by the member's home plan.

2. 2

   Submit the claim to your local Blue plan, which routes it to Unallocated/Not Assigned through the BlueCard® program. Include the full member ID with the I5M prefix exactly as printed on the card.

3. 3

   Track timely filing against the home plan's rules — BCBS filing limits vary by plan and contract, so check our timely filing limits directory and confirm the window that applies to your participation status.

4. 4

   If the claim denies for eligibility or wrong payer, re-verify the prefix — members change plans often and old cards stay in circulation.

Prefix assignments change without notice. Always confirm with the payer or the member's current ID card before filing.

Nearby prefixes