BCBS Prefix List S2A to S9Z
The BCBS Prefix List S2A to S9Z is an important reference for healthcare providers and billing professionals working with Blue Cross Blue Shield. Each BCBS member ID begins with a three-letter prefix. Prefixes in the S2A to S9Z range often represent group health plans, employer-sponsored insurance, and PPO coverage. These prefixes help route claims to the correct BCBS regional office or processing center.
Using the right prefix is essential for smooth claim handling. For example, an ID starting with “S5Z” connects to a specific BCBS plan. If a claim is submitted without verifying the prefix, it may be routed incorrectly, causing delays or denials. That’s why billing and front-office teams depend on prefix lists to guide proper claim submission.
These prefixes are also used to verify eligibility. Staff can enter the prefix into online payer tools to confirm active coverage, deductibles, copayments, and authorization needs. Verifying this information before the visit avoids billing surprises and improves patient communication.
Blue Cross Blue Shield operates through multiple independent companies across different states. Each prefix corresponds to one of these companies. The BCBS Prefix List S2A to S9Z ensures that providers and billing teams can identify the correct payer based on the member ID.
Maintaining an up-to-date prefix list improves billing efficiency and reduces claim errors. It also supports faster payment and fewer rejections. If your office handles a large volume of BCBS claims, using this list will save time and streamline your workflow.
| BCBS Prefix List S2A to S9Z | State lookup | BCBS compnay |
|---|---|---|
| S2A | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| S2B | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2C | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2D | Texas | Blue-Cross Blue-Shield of Texas |
| S2E | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2F | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2G | Texas | Blue-Cross Blue-Shield of Texas |
| S2H | Alabama | Blue-Cross Blue-Shield of Alabama |
| S2I | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| S2J | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2K | Texas | Blue-Cross Blue-Shield of Texas |
| S2L | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2M | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S2N | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2O | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| S2P | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2Q | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| S2R | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S2T | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2U | California | Anthem Blue-Cross |
| S2V | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2W | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2X | Texas | Blue-Cross Blue-Shield of Texas |
| S2Y | Illinois | Blue-Cross Blue-Shield of Illinois |
| S2Z | Texas | Blue-Cross Blue-Shield of Texas |
| S3A | New York (Northeastern) | Blue-Shield of Northeastern New York |
| S3B | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S3C | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S3D | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3E | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3F | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3G | Alaska | Premera Blue-Cross of Alaska |
| S3H | Texas | Blue-Cross Blue-Shield of Texas |
| S3I | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| S3J | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S3K | Texas | Blue-Cross Blue-Shield of Texas |
| S3L | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3M | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3N | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| S3O | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| S3P | Illinois | Blue-Cross Blue-Shield of Illinois |
| S3Q | California | Anthem Blue-Cross |
| S3R | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| S3S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S3T | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| S3U | Delaware | Highmark Blue-Cross Blue-Shield of Delaware |
| S3V | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| S3W | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| S3X | California | Anthem Blue-Cross |
| S3Y | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| S3Z | Arizona | Blue-Cross Blue-Shield of Arizona |
| S4A | Alaska | Premera Blue-Cross of Alaska |
| S4B | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S4C | Alaska | Premera Blue-Cross of Alaska |
| S4D | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S4E | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S4F | Illinois | Blue-Cross Blue-Shield of Illinois |
| S4G | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| S4H | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S4I | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S4J | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S4K | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S4L | Illinois | Blue-Cross Blue-Shield of Illinois |
| S4M | Illinois | Blue-Cross Blue-Shield of Illinois |
| S4N | Illinois | Blue-Cross Blue-Shield of Illinois |
| S4O | - | Prefix Unallocated/Not Assigned |
| S4P | Illinois | Blue-Cross Blue-Shield of Illinois |
| S4Q | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S4R | New York | Empire Blue-Cross Blue-Shield of New York |
| S4S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S4T | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S4U | Texas | Blue-Cross Blue-Shield of Texas |
| S4V | Alaska | Premera Blue-Cross of Alaska |
| S4W | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S4X | Texas | Blue-Cross Blue-Shield of Texas |
| S4Y | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S4Z | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S5A | Texas | Blue-Cross Blue-Shield of Texas |
| S5B | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| S5C | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| S5D | California | Anthem Blue-Cross |
| S5E | Texas | Blue-Cross Blue-Shield of Texas |
| S5F | - | Prefix Unallocated/Not Assigned |
| S5G | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S5H | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S5I | - | Prefix Unallocated/Not Assigned |
| S5J | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S5K | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S5L | Illinois | Blue-Cross Blue-Shield of Illinois |
| S5M | Illinois | Blue-Cross Blue-Shield of Illinois |
| S5N | Texas | Blue-Cross Blue-Shield of Texas |
| S5O | - | Prefix Unallocated/Not Assigned |
| S5P | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| S5Q | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S5R | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| S5S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S5T | Illinois | Blue-Cross Blue-Shield of Illinois |
| S5U | Texas | Blue-Cross Blue-Shield of Texas |
| S5V | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| S5W | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S5X | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S5Y | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S5Z | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S6A | Texas | Blue-Cross Blue-Shield of Texas |
| S6B | Illinois | Blue-Cross Blue-Shield of Illinois |
| S6C | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| S6D | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S6E | Texas | Blue-Cross Blue-Shield of Texas |
| S6F | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S6G | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| S6H | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| S6I | - | Prefix Unallocated/Not Assigned |
| S6J | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| S6K | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| S6L | Texas | Blue-Cross Blue-Shield of Texas |
| S6M | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| S6N | Texas | Blue-Cross Blue-Shield of Texas |
| S6O | - | Prefix Unallocated/Not Assigned |
| S6P | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S6Q | New York | Empire Blue-Cross Blue-Shield of New York |
| S6R | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| S6S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S6T | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S6U | Texas | Blue-Cross Blue-Shield of Texas |
| S6V | California | Anthem Blue-Cross |
| S6W | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S6X | California | Anthem Blue-Cross |
| S6Y | Illinois | Blue-Cross Blue-Shield of Illinois |
| S6Z | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S7A | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S7B | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S7C | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S7D | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| S7E | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S7F | California | Anthem Blue-Cross |
| S7G | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| S7H | Illinois | Blue-Cross Blue-Shield of Illinois |
| S7I | - | Prefix Unallocated/Not Assigned |
| S7J | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| S7K | New Jersey | Horizon Blue-Cross Blue-Shield of New Jersey |
| S7L | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S7M | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S7N | - | Prefix Unallocated/Not Assigned |
| S7O | - | Prefix Unallocated/Not Assigned |
| S7P | Illinois | Blue-Cross Blue-Shield of Illinois |
| S7Q | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S7R | California | Anthem Blue-Cross |
| S7S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S7T | Illinois | Blue-Cross Blue-Shield of Illinois |
| S7U | Texas | Blue-Cross Blue-Shield of Texas |
| S7V | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| S7W | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S7X | Illinois | Blue-Cross Blue-Shield of Illinois |
| S7Y | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S7Z | California | Anthem Blue-Cross |
| S8A | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| S8B | Texas | Blue-Cross Blue-Shield of Texas |
| S8C | New York | Empire Blue-Cross Blue-Shield of New York |
| S8D | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8E | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S8F | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8G | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8H | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8I | - | Prefix Unallocated/Not Assigned |
| S8J | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8K | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S8L | Illinois | Blue-Cross Blue-Shield of Illinois |
| S8M | Texas | Blue-Cross Blue-Shield of Texas |
| S8N | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| S8O | - | Prefix Unallocated/Not Assigned |
| S8P | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8Q | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8R | Texas | Blue-Cross Blue-Shield of Texas |
| S8S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S8T | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S8U | - | Prefix Unallocated/Not Assigned |
| S8V | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8W | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8X | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S8Y | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| S8Z | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S9A | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9B | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| S9C | Texas | Blue-Cross Blue-Shield of Texas |
| S9D | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| S9E | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| S9F | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9G | Texas | Blue-Cross Blue-Shield of Texas |
| S9H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S9I | - | Prefix Unallocated/Not Assigned |
| S9J | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9K | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S9L | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| S9M | Michigan | Blue-Cross Blue-Shield of Michigan |
| S9N | Texas | Blue-Cross Blue-Shield of Texas |
| S9O | - | Prefix Unallocated/Not Assigned |
| S9P | California | Anthem Blue-Cross |
| S9Q | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9R | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| S9S | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| S9T | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| S9U | - | Prefix Unallocated/Not Assigned |
| S9V | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9W | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9X | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| S9Y | - | Prefix Unallocated/Not Assigned |
| S9Z | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
Hi, I’m Hammad Butt the founder and content creator behind BCBS Prefix List. I’m a U.S. Citizen with over 10 years of hands-on experience in the medical billing and healthcare administration industry. Throughout my career, I’ve worked with private practices, urgent care centers, and billing companies across the United States, helping them navigate complex insurance systems especially Blue Cross Blue Shield (BCBS) claims and verifications.