| N2A | Illinois | Blue-Cross Blue-Shield of Illinois |
| N2B | Illinois | Blue-Cross Blue-Shield of Illinois |
| N2C | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N2D | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| N2E | Alabama | Blue-Cross Blue-Shield of Alabama |
| N2F | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N2G | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| N2H | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N2I | - | Unallocated/Not Assigned |
| N2J | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N2K | California | Anthem Blue-Cross |
| N2L | Texas | Blue-Cross Blue-Shield of Texas |
| N2M | - | Unallocated/Not Assigned |
| N2N | Texas | Blue-Cross Blue-Shield of Texas |
| N2O | - | Unallocated/Not Assigned |
| N2P | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| N2Q | Pennsylvania | Highmark Blue-Cross Blue-Shield of Pennsylvania |
| N2R | Missouri | Anthem Blue-Cross Blue-Shield of Missouri |
| N2S | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N2T | Pennsylvania | Independence Blue-Cross of Philadelphia and Southeastern Pennsylvania |
| N2U | California | Anthem Blue-Cross |
| N2V | Nevada | Anthem Blue-Cross Blue-Shield of Nevada |
| N2W | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N2X | California | Anthem Blue-Cross |
| N2Y | New York (Western) | Blue-Cross Blue-Shield of Western New York |
| N2Z | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| N3A | New York | Empire Blue-Cross Blue-Shield of New York |
| N3B | North Carolina | Blue-Cross Blue-Shield of North Carolina |
| N3C | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N3D | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| N3E | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| N3F | Illinois | Blue-Cross Blue-Shield of Illinois |
| N3G | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N3H | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| N3I | - | Unallocated/Not Assigned |
| N3J | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N3K | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N3L | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| N3M | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N3N | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N3O | - | Unallocated/Not Assigned |
| N3P | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| N3Q | - | Unallocated/Not Assigned |
| N3R | Texas | Blue-Cross Blue-Shield of Texas |
| N3S | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| N3T | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| N3U | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| N3V | Illinois | Blue-Cross Blue-Shield of Illinois |
| N3W | Illinois | Blue-Cross Blue-Shield of Illinois |
| N3X | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N3Y | Rhode Island | Blue-Cross Blue-Shield of Rhode Island |
| N3Z | Western New York | Highmark Blue-Cross Blue-Shield of Western New York |
| N4A | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4B | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N4C | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N4D | Wiconsin | Anthem Blue-Cross Blue-Shield of Wiconsin |
| N4E | - | Unallocated/Not Assigned |
| N4F | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N4G | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N4H | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N4I | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| N4J | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4K | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4L | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4M | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4N | Illinois | Blue-Cross Blue-Shield of Illinois |
| N4O | - | Unallocated/Not Assigned |
| N4P | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| N4Q | - | Unallocated/Not Assigned |
| N4R | - | Unallocated/Not Assigned |
| N4S | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| N4T | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N4U | - | Unallocated/Not Assigned |
| N4V | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| N4W | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N4X | California | Anthem Blue-Cross |
| N4Y | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N4Z | - | Unallocated/Not Assigned |
| N5A | Illinois | Blue-Cross Blue-Shield of Illinois |
| N5B | Alabama | Blue-Cross Blue-Shield of Alabama |
| N5C | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N5D | - | Unallocated/Not Assigned |
| N5E | - | Unallocated/Not Assigned |
| N5F | California | Anthem Blue-Cross |
| N5G | - | Unallocated/Not Assigned |
| N5H | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N5I | - | Unallocated/Not Assigned |
| N5J | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N5K | - | Unallocated/Not Assigned |
| N5L | Illinois | Blue-Cross Blue-Shield of Illinois |
| N5M | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| N5N | Illinois | Blue-Cross Blue-Shield of Illinois |
| N5O | - | Unallocated/Not Assigned |
| N5P | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N5Q | - | Unallocated/Not Assigned |
| N5R | - | Unallocated/Not Assigned |
| N5S | - | Unallocated/Not Assigned |
| N5T | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N5U | - | Unallocated/Not Assigned |
| N5V | - | Unallocated/Not Assigned |
| N5W | - | Unallocated/Not Assigned |
| N5X | - | Unallocated/Not Assigned |
| N5Y | - | Unallocated/Not Assigned |
| N5Z | - | Unallocated/Not Assigned |
| N6A | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N6B | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| N6C | Vermont | Blue-Cross of Vermont |
| N6D | Illinois | Blue-Cross Blue-Shield of Illinois |
| N6E | Wiconsin | Anthem Blue-Cross Blue-Shield of Wiconsin |
| N6F | Wiconsin | Anthem Blue-Cross Blue-Shield of Wiconsin |
| N6G | - | Unallocated/Not Assigned |
| N6H | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| N6I | - | Unallocated/Not Assigned |
| N6J | - | Unallocated/Not Assigned |
| N6K | - | Unallocated/Not Assigned |
| N6L | Texas | Blue-Cross Blue-Shield of Texas |
| N6M | California | Anthem Blue-Cross |
| N6N | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N6O | - | Unallocated/Not Assigned |
| N6P | Alaska | Premera Blue-Cross of Alaska |
| N6Q | - | Unallocated/Not Assigned |
| N6R | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N6S | Pennsylvania | Highmark Blue-Shield of Pennsylvania |
| N6T | California | Anthem Blue-Cross |
| N6U | - | Unallocated/Not Assigned |
| N6V | - | Unallocated/Not Assigned |
| N6W | - | Unallocated/Not Assigned |
| N6X | - | Unallocated/Not Assigned |
| N6Y | New York | Empire Blue-Cross Blue-Shield of New York |
| N6Z | - | Unallocated/Not Assigned |
| N7A | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N7B | Illinois | Blue-Cross Blue-Shield of Illinois |
| N7C | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N7D | Illinois | Blue-Cross Blue-Shield of Illinois |
| N7E | - | Unallocated/Not Assigned |
| N7F | - | Unallocated/Not Assigned |
| N7G | - | Unallocated/Not Assigned |
| N7H | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| N7I | - | Unallocated/Not Assigned |
| N7J | - | Unallocated/Not Assigned |
| N7K | - | Unallocated/Not Assigned |
| N7L | Texas | Blue-Cross Blue-Shield of Texas |
| N7M | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| N7N | - | Unallocated/Not Assigned |
| N7O | - | Unallocated/Not Assigned |
| N7P | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N7Q | - | Unallocated/Not Assigned |
| N7R | - | Unallocated/Not Assigned |
| N7S | - | Unallocated/Not Assigned |
| N7T | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| N7U | - | Unallocated/Not Assigned |
| N7V | - | Unallocated/Not Assigned |
| N7W | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N7X | - | Unallocated/Not Assigned |
| N7Y | New York | Empire Blue-Cross Blue-Shield of New York |
| N7Z | - | Unallocated/Not Assigned |
| N8A | Virginia | Anthem Blue-Cross Blue-Shield of Virginia |
| N8B | - | Unallocated/Not Assigned |
| N8C | California | Anthem Blue-Cross |
| N8D | - | Unallocated/Not Assigned |
| N8E | - | Unallocated/Not Assigned |
| N8F | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| N8G | - | Unallocated/Not Assigned |
| N8H | New Hampshire | Anthem Blue-Cross Blue-Shield of New Hampshire |
| N8I | - | Unallocated/Not Assigned |
| N8J | - | Unallocated/Not Assigned |
| N8K | - | Unallocated/Not Assigned |
| N8L | Texas | Blue-Cross Blue-Shield of Texas |
| N8M | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| N8N | - | Unallocated/Not Assigned |
| N8O | - | Unallocated/Not Assigned |
| N8P | Alaska | Premera Blue-Cross Blue-Shield of Alaska |
| N8Q | - | Unallocated/Not Assigned |
| N8R | - | Unallocated/Not Assigned |
| N8S | - | Unallocated/Not Assigned |
| N8T | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| N8U | - | Unallocated/Not Assigned |
| N8V | - | Unallocated/Not Assigned |
| N8W | - | Unallocated/Not Assigned |
| N8X | - | Unallocated/Not Assigned |
| N8Y | California | Anthem Blue-Cross |
| N8Z | - | Unallocated/Not Assigned |
| N9A | - | Unallocated/Not Assigned |
| N9B | California | Anthem Blue-Cross |
| N9C | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N9D | - | Unallocated/Not Assigned |
| N9E | - | Unallocated/Not Assigned |
| N9F | - | Unallocated/Not Assigned |
| N9G | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N9H | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N9I | - | Unallocated/Not Assigned |
| N9J | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N9K | - | Unallocated/Not Assigned |
| N9L | Texas | Blue-Cross Blue-Shield of Texas |
| N9M | New York | Empire Blue-Cross Blue-Shield of New York |
| N9N | - | Unallocated/Not Assigned |
| N9O | - | Unallocated/Not Assigned |
| N9P | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N9Q | - | Unallocated/Not Assigned |
| N9R | - | Unallocated/Not Assigned |
| N9S | - | Unallocated/Not Assigned |
| N9T | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N9U | - | Unallocated/Not Assigned |
| N9V | - | Unallocated/Not Assigned |
| N9W | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| N9X | - | Unallocated/Not Assigned |
| N9Y | Minnesota | Blue-Cross Blue-Shield of Minnesota |
| N9Z | - | Unallocated/Not Assigned |