| BCBS Prefix List 2024 - Alpha Numeric | State Lookup | BCBS Company |
|---|---|---|
| M2A | - | Unallocated/Not Assigned |
| M2B | - | Unallocated/Not Assigned |
| M2C | Illinois | Blue-Cross Blue-Shield of Illinois |
| M2D | Illinois | Blue-Cross Blue-Shield of Illinois |
| M2E | Texas | Blue-Cross Blue-Shield of Texas |
| M2F | Texas | Blue-Cross Blue-Shield of Texas |
| M2G | Texas | Blue-Cross Blue-Shield of Texas |
| M2H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M2I | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| M2J | Illinois | Blue-Cross Blue-Shield of Illinois |
| M2K | Arizona | Blue-Cross Blue-Shield of Arizona |
| M2L | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| M2M | California | Anthem Blue-Cross |
| M2N | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M2O | - | Unallocated/Not Assigned |
| M2P | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M2Q | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M2R | Texas | Blue-Cross Blue-Shield of Texas |
| M2S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M2T | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M2U | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M2V | Arizona | Blue-Cross Blue-Shield of Arizona |
| M2W | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| M2X | Montana | Blue-Cross Blue-Shield of Montana |
| M2Y | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M2Z | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M3A | Kansas | Blue-Cross Blue-Shield of Kansas |
| M3B | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| M3C | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| M3D | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M3E | Illinois | Blue-Cross Blue-Shield of Illinois |
| M3F | Texas | Blue-Cross Blue-Shield of Texas |
| M3G | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| M3H | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| M3I | - | Unallocated/Not Assigned |
| M3J | New York | Empire Blue-Cross Blue-Shield of New York |
| M3K | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M3L | Michigan | Blue-Cross Blue-Shield of Michigan |
| M3M | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M3N | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| M3O | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M3P | Arizona | Blue-Cross Blue-Shield of Arizona |
| M3Q | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| M3R | Texas | Blue-Cross Blue-Shield of Texas |
| M3S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M3T | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M3U | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M3V | Arizona | Blue-Cross Blue-Shield of Arizona |
| M3W | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M3X | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M3Y | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M3Z | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M4A | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| M4B | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| M4C | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| M4D | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M4E | Texas | Blue-Cross Blue-Shield of Texas |
| M4F | Texas | Blue-Cross Blue-Shield of Texas |
| M4G | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M4H | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M4I | - | Unallocated/Not Assigned |
| M4J | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| M4K | Arizona | Blue-Cross Blue-Shield of Arizona |
| M4L | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| M4M | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M4N | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M4O | - | Unallocated/Not Assigned |
| M4P | Texas | Blue-Cross Blue-Shield of Texas |
| M4Q | Michigan | Blue-Cross Blue-Shield of Michigan |
| M4R | New York (Northeastern) | Blue-Shield of Northeastern New York |
| M4S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M4T | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M4U | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| M4V | North Dakota | Blue-Cross Blue-Shield of North Dakota |
| M4W | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M4X | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M4Y | Idaho | Blue-Cross of Idaho |
| M4Z | Texas | Blue-Cross Blue-Shield of Texas |
| M5A | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| M5B | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| M5C | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M5D | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M5E | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M5F | Texas | Blue-Cross Blue-Shield of Texas |
| M5G | Michigan | Blue-Cross Blue-Shield of Michigan |
| M5H | Texas | Blue-Cross Blue-Shield of Texas |
| M5I | California | Anthem Blue-Cross |
| M5J | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M5K | Illinois | Blue-Cross Blue-Shield of Illinois |
| M5L | Pennsylvania | Independence Blue-Cross of Pennsylvania |
| M5M | Texas | Blue-Cross Blue-Shield of Texas |
| M5N | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| M5O | - | Unallocated/Not Assigned |
| M5P | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M5Q | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M5R | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| M5S | Texas | Blue-Cross Blue-Shield of Texas |
| M5T | Massachusetts | Blue-Cross Blue-Shield of Massachusetts |
| M5U | California | Anthem Blue-Cross |
| M5V | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M5W | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M5X | Illinois | Blue-Cross Blue-Shield of Illinois |
| M5Y | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| M5Z | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| M6A | Texas | Blue-Cross Blue-Shield of Texas |
| M6B | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| M6C | New York | Empire Blue-Cross Blue-Shield of New York |
| M6D | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M6E | New York | Empire Blue-Cross Blue-Shield of New York |
| M6F | Texas | Blue-Cross Blue-Shield of Texas |
| M6G | New York | Empire Blue-Cross Blue-Shield of New York |
| M6H | New York | Empire Blue-Cross Blue-Shield of New York |
| M6I | - | Unallocated/Not Assigned |
| M6J | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M6K | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M6L | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M6M | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| M6N | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| M6O | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M6P | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M6Q | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| M6R | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M6S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M6T | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M6U | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| M6V | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| M6W | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M6X | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| M6Y | New York | Empire Blue-Cross Blue-Shield of New York |
| M6Z | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M7A | California | Anthem Blue-Cross |
| M7B | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| M7C | New York | Empire Blue-Cross Blue-Shield of New York |
| M7D | North Dakota | Blue-Cross Blue-Shield of North Dakota |
| M7E | California | Anthem Blue-Cross |
| M7F | Texas | Blue-Cross Blue-Shield of Texas |
| M7G | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7H | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7I | - | Unallocated/Not Assigned |
| M7J | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7K | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7L | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M7M | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| M7N | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M7O | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M7P | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| M7Q | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M7R | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M7S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M7T | California | Anthem Blue-Cross |
| M7U | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7V | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| M7W | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M7X | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| M7Y | - | Unallocated/Not Assigned |
| M7Z | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| M8A | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| M8B | Illinois | Blue-Cross Blue-Shield of Illinois |
| M8C | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| M8D | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| M8E | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M8F | Texas | Blue-Cross Blue-Shield of Texas |
| M8G | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M8H | New York | Empire Blue-Cross Blue-Shield of New York |
| M8I | - | Unallocated/Not Assigned |
| M8J | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M8K | Texas | Blue-Cross Blue-Shield of Texas |
| M8L | California | Anthem Blue-Cross |
| M8M | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M8N | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M8O | - | Unallocated/Not Assigned |
| M8P | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| M8Q | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M8R | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M8S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M8T | Illinois | Blue-Cross Blue-Shield of Illinois |
| M8U | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M8V | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| M8W | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| M8X | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| M8Y | Texas | Blue-Cross Blue-Shield of Texas |
| M8Z | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9A | New York | Empire Blue-Cross Blue-Shield of New York |
| M9B | Illinois | Blue-Cross Blue-Shield of Illinois |
| M9C | New York | Empire Blue-Cross Blue-Shield of New York |
| M9D | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9E | Maine | Anthem Blue-Cross Blue-Shield of Maine |
| M9F | Texas | Blue-Cross Blue-Shield of Texas |
| M9G | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9H | Illinois | Blue-Cross Blue-Shield of Illinois |
| M9I | - | Unallocated/Not Assigned |
| M9J | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9K | Texas | Blue-Cross Blue-Shield of Texas |
| M9L | Texas | Blue-Cross Blue-Shield of Texas |
| M9M | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9N | California | Anthem Blue-Cross |
| M9O | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9P | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| M9Q | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M9R | California | Anthem Blue-Cross |
| M9S | Illinois | Blue-Cross Blue-Shield of Illinois |
| M9T | Texas | Blue-Cross Blue-Shield of Texas |
| M9U | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| M9V | - | Unallocated/Not Assigned |
| M9W | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| M9X | - | Couple Health |
| M9Y | - | Couple Health |
| M9Z | - | Couple Health |
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