| P2A | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P2B | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P2C | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P2D | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P2E | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| P2F | Illinois | Blue-Cross Blue-Shield of Illinois |
| P2G | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P2H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P2I | California | Anthem Blue-Cross |
| P2J | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2K | Illinois | Blue-Cross Blue-Shield of Illinois |
| P2L | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2M | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P2N | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2O | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2P | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P2Q | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2R | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P2S | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2T | Illinois | Blue-Cross Blue-Shield of Illinois |
| P2U | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2V | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P2X | Illinois | Blue-Cross Blue-Shield of Illinois |
| P2Y | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P2Z | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3A | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P3B | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P3C | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P3D | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3E | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P3F | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P3G | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3H | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| P3I | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3J | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3K | Kentucky | Anthem Blue-Cross Blue-Shield of Kentucky |
| P3L | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P3M | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P3N | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P3O | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P3P | Texas | Blue-Cross Blue-Shield of Texas |
| P3Q | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P3R | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| P3S | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P3T | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P3U | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P3V | California | Anthem Blue-Cross |
| P3W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P3X | Illinois | Blue-Cross Blue-Shield of Illinois |
| P3Y | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P3Z | Alaska | Premera Blue-Cross of Alaska |
| P4A | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| P4B | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P4C | Florida | Florida-Blue |
| P4D | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P4E | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P4F | Illinois | Blue-Cross Blue-Shield of Illinois |
| P4G | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P4H | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| P4I | - | Prefix Unallocated/Not Assigned |
| P4J | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| P4K | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P4L | California | Anthem Blue-Cross |
| P4M | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P4N | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| P4O | - | Prefix Unallocated/Not Assigned |
| P4P | Michigan | Blue-Cross Blue-Shield of Michigan |
| P4Q | Michigan | Blue-Cross Blue-Shield of Michigan |
| P4R | - | Prefix Unallocated/Not Assigned |
| P4S | Alabama | Blue-Cross Blue-Shield of Alabama |
| P4T | Alaska | Premera Blue-Cross of Alaska |
| P4U | - | Prefix Unallocated/Not Assigned |
| P4V | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| P4W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P4X | Illinois | Blue-Cross Blue-Shield of Illinois |
| P4Y | New York | Empire Blue-Cross Blue-Shield of New York |
| P4Z | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| P5A | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| P5B | California | Anthem Blue-Cross |
| P5C | Illinois | Blue-Cross Blue-Shield of Illinois |
| P5D | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P5E | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| P5F | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P5G | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P5H | California | Anthem Blue-Cross |
| P5I | - | Prefix Unallocated/Not Assigned |
| P5J | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| P5K | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| P5L | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P5M | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| P5N | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P5O | - | Prefix Unallocated/Not Assigned |
| P5P | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P5Q | - | Prefix Unallocated/Not Assigned |
| P5R | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P5S | California | Anthem Blue-Cross |
| P5T | Texas | Blue-Cross Blue-Shield of Texas |
| P5U | Illinois | Blue-Cross Blue-Shield of Illinois |
| P5V | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P5W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P5X | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P5Y | California | Anthem Blue-Cross |
| P5Z | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| P6A | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P6B | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P6C | Illinois | Blue-Cross Blue-Shield of Illinois |
| P6D | Illinois | Blue-Cross Blue-Shield of Illinois |
| P6E | Illinois | Blue-Cross Blue-Shield of Illinois |
| P6F | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P6G | - | Prefix Unallocated/Not Assigned |
| P6H | Texas | Blue-Cross Blue-Shield of Texas |
| P6I | - | Prefix Unallocated/Not Assigned |
| P6J | - | Prefix Unallocated/Not Assigned |
| P6K | Texas | Blue-Cross Blue-Shield of Texas |
| P6L | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| P6M | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P6N | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P6O | - | Prefix Unallocated/Not Assigned |
| P6P | Illinois | Blue-Cross Blue-Shield of Illinois |
| P6Q | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| P6R | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| P6S | - | Prefix Unallocated/Not Assigned |
| P6T | Pennsylvania | Capital Blue-Cross of Pennsylvania |
| P6U | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P6V | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P6W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P6X | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| P6Y | - | Prefix Unallocated/Not Assigned |
| P6Z | Alaska | Premera Blue-Cross of Alaska |
| P7A | Illinois | Blue-Cross Blue-Shield of Illinois |
| P7B | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P7C | Illinois | Blue-Cross Blue-Shield of Illinois |
| P7D | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| P7E | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P7F | Michigan | Blue-Cross Blue-Shield of Michigan |
| P7G | Michigan | Blue-Cross Blue-Shield of Michigan |
| P7H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P7I | - | Prefix Unallocated/Not Assigned |
| P7J | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| P7K | - | Prefix Unallocated/Not Assigned |
| P7L | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P7M | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P7N | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P7O | - | Prefix Unallocated/Not Assigned |
| P7P | Illinois | Blue-Cross Blue-Shield of Illinois |
| P7Q | - | Prefix Unallocated/Not Assigned |
| P7R | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P7S | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P7T | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| P7U | - | Prefix Unallocated/Not Assigned |
| P7V | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| P7W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P7X | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| P7Y | California | Anthem Blue-Cross |
| P7Z | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| P8A | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| P8B | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| P8C | Illinois | Blue-Cross Blue-Shield of Illinois |
| P8D | - | Prefix Unallocated/Not Assigned |
| P8E | - | Prefix Unallocated/Not Assigned |
| P8F | California | Anthem Blue-Cross |
| P8G | California | Anthem Blue-Cross |
| P8H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P8I | - | Prefix Unallocated/Not Assigned |
| P8J | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| P8K | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| P8L | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8M | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8N | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8O | - | Prefix Unallocated/Not Assigned |
| P8P | Illinois | Blue-Cross Blue-Shield of Illinois |
| P8Q | - | Prefix Unallocated/Not Assigned |
| P8R | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8S | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| P8T | Illinois | Blue-Cross Blue-Shield of Illinois |
| P8U | - | Prefix Unallocated/Not Assigned |
| P8V | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P8X | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P8Y | - | Prefix Unallocated/Not Assigned |
| P8Z | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| P9A | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P9B | California | Anthem Blue-Cross |
| P9C | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P9D | New York | Empire Blue-Cross Blue-Shield of New York |
| P9E | Wisconsin | Anthem Blue-Cross Blue-Shield of Wisconsin |
| P9F | California | Anthem Blue-Cross |
| P9G | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| P9H | - | Prefix Unallocated/Not Assigned |
| P9I | - | Prefix Unallocated/Not Assigned |
| P9J | - | Prefix Unallocated/Not Assigned |
| P9K | - | Prefix Unallocated/Not Assigned |
| P9L | - | Prefix Unallocated/Not Assigned |
| P9M | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| P9N | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| P9O | - | Prefix Unallocated/Not Assigned |
| P9P | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| P9Q | - | Prefix Unallocated/Not Assigned |
| P9R | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| P9S | California | Anthem Blue-Cross |
| P9T | New York | Empire Blue-Cross Blue-Shield of New York |
| P9U | - | Prefix Unallocated/Not Assigned |
| P9V | - | Prefix Unallocated/Not Assigned |
| P9W | Illinois | Blue-Cross Blue-Shield of Illinois |
| P9X | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| P9Y | - | Prefix Unallocated/Not Assigned |
| P9Z | California | Anthem Blue-Cross |