| Y2A | Illinois | Blue-Cross Blue-Shield of Illinois |
| Y2B | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| Y2C | California | Anthem Blue-Cross California |
| Y2D | * | Prefix Unallocated/Not Assigned |
| Y2E | * | Prefix Unallocated/Not Assigned |
| Y2F | Maryland/District of Columbia/Northern Virginia | Carefirst Blue-Cross Blue-Shield |
| Y2G | * | Prefix Unallocated/Not Assigned |
| Y2H | * | Prefix Unallocated/Not Assigned |
| Y2I | * | Prefix Unallocated/Not Assigned |
| Y2J | * | Prefix Unallocated/Not Assigned |
| Y2K | * | Prefix Unallocated/Not Assigned |
| Y2L | * | Prefix Unallocated/Not Assigned |
| Y2M | Nebraska | Blue-Cross Blue-Shield of Nebraska |
| Y2N | Illinois | Blue-Cross Blue-Shield of Illinois |
| Y2O | * | Prefix Unallocated/Not Assigned |
| Y2P | * | Prefix Unallocated/Not Assigned |
| Y2Q | * | Prefix Unallocated/Not Assigned |
| Y2R | Montana | Blue-Cross Blue-Shield of Montana |
| Y2S | Montana | Blue-Cross Blue-Shield of Montana |
| Y2T | Montana | Blue-Cross Blue-Shield of Montana |
| Y2U | * | Prefix Unallocated/Not Assigned |
| Y2V | * | Prefix Unallocated/Not Assigned |
| Y2W | Illinois | Blue-Cross Blue-Shield of Illinois |
| Y2X | * | Prefix Unallocated/Not Assigned |
| Y2Y | * | Prefix Unallocated/Not Assigned |
| Y2Z | * | Prefix Unallocated/Not Assigned |
| Y3A | * | Prefix Unallocated/Not Assigned |
| Y3B | * | Prefix Unallocated/Not Assigned |
| Y3C | Illinois | Blue-Cross Blue-Shield of Illinois |
| Y3D | * | Prefix Unallocated/Not Assigned |
| Y3E | Alaska | Premera Blue-Cross of Alaska |
| Y3F | * | Prefix Unallocated/Not Assigned |
| Y3G | Alaska | Premera Blue-Cross of Alaska |
| Y3H | * | Prefix Unallocated/Not Assigned |
| Y3I | * | Prefix Unallocated/Not Assigned |
| Y3J | * | Prefix Unallocated/Not Assigned |
| Y3K | Alaska | Premera Blue-Cross of Alaska |
| Y3L | * | Prefix Unallocated/Not Assigned |
| Y3M | California | Anthem Blue-Cross California |
| Y3N | * | Prefix Unallocated/Not Assigned |
| Y3O | * | Prefix Unallocated/Not Assigned |
| Y3P | * | Prefix Unallocated/Not Assigned |
| Y3Q | * | Prefix Unallocated/Not Assigned |
| Y3R | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| Y3S | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| Y3T | New Mexico | Blue-Cross Blue-Shield of New Mexico |
| Y3U | * | Prefix Unallocated/Not Assigned |
| Y3V | * | Prefix Unallocated/Not Assigned |
| Y3W | * | Prefix Unallocated/Not Assigned |
| Y3X | * | Prefix Unallocated/Not Assigned |
| Y3Y | * | Prefix Unallocated/Not Assigned |
| Y3Z | * | Prefix Unallocated/Not Assigned |
| Y4A | * | Prefix Unallocated/Not Assigned |
| Y4B | * | Prefix Unallocated/Not Assigned |
| Y4C | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| Y4D | * | Prefix Unallocated/Not Assigned |
| Y4E | * | Prefix Unallocated/Not Assigned |
| Y4F | * | Prefix Unallocated/Not Assigned |
| Y4G | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| Y4H | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| Y4I | * | Prefix Unallocated/Not Assigned |
| Y4J | * | Prefix Unallocated/Not Assigned |
| Y4K | * | Prefix Unallocated/Not Assigned |
| Y4L | * | Prefix Unallocated/Not Assigned |
| Y4M | * | Prefix Unallocated/Not Assigned |
| Y4N | * | Prefix Unallocated/Not Assigned |
| Y4O | * | Prefix Unallocated/Not Assigned |
| Y4P | Georgia | Anthem Blue-Cross Blue-Shield of Georgia |
| Y4Q | * | Prefix Unallocated/Not Assigned |
| Y4R | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| Y4S | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| Y4T | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| Y4U | * | Prefix Unallocated/Not Assigned |
| Y4V | * | Prefix Unallocated/Not Assigned |
| Y4W | * | Prefix Unallocated/Not Assigned |
| Y4X | * | Prefix Unallocated/Not Assigned |
| Y4Y | * | Prefix Unallocated/Not Assigned |
| Y4Z | * | Prefix Unallocated/Not Assigned |
| Y5A | * | Prefix Unallocated/Not Assigned |
| Y5B | * | Prefix Unallocated/Not Assigned |
| Y5C | Illinois | Blue-Cross Blue-Shield of Illinois |
| Y5D | * | Prefix Unallocated/Not Assigned |
| Y5E | * | Prefix Unallocated/Not Assigned |
| Y5F | * | Prefix Unallocated/Not Assigned |
| Y5G | * | Prefix Unallocated/Not Assigned |
| Y5H | * | Prefix Unallocated/Not Assigned |
| Y5I | * | Prefix Unallocated/Not Assigned |
| Y5J | * | Prefix Unallocated/Not Assigned |
| Y5K | * | Prefix Unallocated/Not Assigned |
| Y5L | * | Prefix Unallocated/Not Assigned |
| Y5M | * | Prefix Unallocated/Not Assigned |
| Y5N | * | Prefix Unallocated/Not Assigned |
| Y5O | * | Prefix Unallocated/Not Assigned |
| Y5P | * | Prefix Unallocated/Not Assigned |
| Y5Q | * | Prefix Unallocated/Not Assigned |
| Y5R | * | Prefix Unallocated/Not Assigned |
| Y5S | * | Prefix Unallocated/Not Assigned |
| Y5T | Connecticut | Anthem Blue-Cross Blue-Shield of Connecticut |
| Y5U | * | Prefix Unallocated/Not Assigned |
| Y5V | * | Prefix Unallocated/Not Assigned |
| Y5W | * | Prefix Unallocated/Not Assigned |
| Y5X | * | Prefix Unallocated/Not Assigned |
| Y5Y | * | Prefix Unallocated/Not Assigned |
| Y5Z | * | Prefix Unallocated/Not Assigned |
| Y6A | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y6B | * | Prefix Unallocated/Not Assigned |
| Y6C | * | Prefix Unallocated/Not Assigned |
| Y6D | * | Prefix Unallocated/Not Assigned |
| Y6E | * | Prefix Unallocated/Not Assigned |
| Y6F | * | Prefix Unallocated/Not Assigned |
| Y6G | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y6H | * | Prefix Unallocated/Not Assigned |
| Y6I | * | Prefix Unallocated/Not Assigned |
| Y6J | * | Prefix Unallocated/Not Assigned |
| Y6K | * | Prefix Unallocated/Not Assigned |
| Y6L | * | Prefix Unallocated/Not Assigned |
| Y6M | Ohio | Anthem Blue-Cross Blue-Shield of Ohio |
| Y6N | * | Prefix Unallocated/Not Assigned |
| Y6O | * | Prefix Unallocated/Not Assigned |
| Y6P | New York | Empire Blue-Cross Blue-Shield of New York |
| Y6Q | * | Prefix Unallocated/Not Assigned |
| Y6R | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y6S | * | Prefix Unallocated/Not Assigned |
| Y6T | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y6U | * | Prefix Unallocated/Not Assigned |
| Y6V | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y6W | * | Prefix Unallocated/Not Assigned |
| Y6X | * | Prefix Unallocated/Not Assigned |
| Y6Y | * | Prefix Unallocated/Not Assigned |
| Y6Z | * | Prefix Unallocated/Not Assigned |
| Y7A | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y7B | * | Prefix Unallocated/Not Assigned |
| Y7C | * | Prefix Unallocated/Not Assigned |
| Y7D | * | Prefix Unallocated/Not Assigned |
| Y7E | * | Prefix Unallocated/Not Assigned |
| Y7F | * | Prefix Unallocated/Not Assigned |
| Y7G | * | Prefix Unallocated/Not Assigned |
| Y7H | * | Prefix Unallocated/Not Assigned |
| Y7I | * | Prefix Unallocated/Not Assigned |
| Y7J | * | Prefix Unallocated/Not Assigned |
| Y7K | * | Prefix Unallocated/Not Assigned |
| Y7L | * | Prefix Unallocated/Not Assigned |
| Y7M | * | Prefix Unallocated/Not Assigned |
| Y7N | New York | Empire Blue-Cross Blue-Shield of New York |
| Y7O | * | Prefix Unallocated/Not Assigned |
| Y7P | * | Prefix Unallocated/Not Assigned |
| Y7Q | * | Prefix Unallocated/Not Assigned |
| Y7R | * | Prefix Unallocated/Not Assigned |
| Y7S | * | Prefix Unallocated/Not Assigned |
| Y7T | * | Prefix Unallocated/Not Assigned |
| Y7U | Oklahoma | Blue-Cross Blue-Shield of Oklahoma |
| Y7V | * | Prefix Unallocated/Not Assigned |
| Y7W | * | Prefix Unallocated/Not Assigned |
| Y7X | * | Prefix Unallocated/Not Assigned |
| Y7Y | * | Prefix Unallocated/Not Assigned |
| Y7Z | * | Prefix Unallocated/Not Assigned |
| Y8A | * | Prefix Unallocated/Not Assigned |
| Y8B | * | Prefix Unallocated/Not Assigned |
| Y8C | Colorado | Anthem Blue-Cross Blue-Shield of Colorado |
| Y8D | * | Prefix Unallocated/Not Assigned |
| Y8E | New York | Empire Blue-Cross Blue-Shield of New York |
| Y8F | * | Prefix Unallocated/Not Assigned |
| Y8G | * | Prefix Unallocated/Not Assigned |
| Y8H | * | Prefix Unallocated/Not Assigned |
| Y8I | * | Prefix Unallocated/Not Assigned |
| Y8J | * | Prefix Unallocated/Not Assigned |
| Y8K | * | Prefix Unallocated/Not Assigned |
| Y8L | * | Prefix Unallocated/Not Assigned |
| Y8M | California | Anthem Blue-Cross California |
| Y8N | * | Prefix Unallocated/Not Assigned |
| Y8O | * | Prefix Unallocated/Not Assigned |
| Y8P | * | Prefix Unallocated/Not Assigned |
| Y8Q | * | Prefix Unallocated/Not Assigned |
| Y8R | * | Prefix Unallocated/Not Assigned |
| Y8S | * | Prefix Unallocated/Not Assigned |
| Y8T | * | Prefix Unallocated/Not Assigned |
| Y8U | * | Prefix Unallocated/Not Assigned |
| Y8V | * | Prefix Unallocated/Not Assigned |
| Y8W | * | Prefix Unallocated/Not Assigned |
| Y8X | * | Prefix Unallocated/Not Assigned |
| Y8Y | * | Prefix Unallocated/Not Assigned |
| Y8Z | * | Prefix Unallocated/Not Assigned |
| Y9A | * | Prefix Unallocated/Not Assigned |
| Y9B | * | Prefix Unallocated/Not Assigned |
| Y9C | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y9D | * | Prefix Unallocated/Not Assigned |
| Y9E | * | Prefix Unallocated/Not Assigned |
| Y9F | * | Prefix Unallocated/Not Assigned |
| Y9G | * | Prefix Unallocated/Not Assigned |
| Y9H | Oregon/Idaho/Utah/Washington | Regence Blue-Cross Blue-Shield |
| Y9I | * | Prefix Unallocated/Not Assigned |
| Y9J | * | Prefix Unallocated/Not Assigned |
| Y9K | * | Prefix Unallocated/Not Assigned |
| Y9L | * | Prefix Unallocated/Not Assigned |
| Y9M | * | Prefix Unallocated/Not Assigned |
| Y9N | Indiana | Anthem Blue-Cross Blue-Shield of Indiana |
| Y9O | * | Prefix Unallocated/Not Assigned |
| Y9P | * | Prefix Unallocated/Not Assigned |
| Y9Q | * | Prefix Unallocated/Not Assigned |
| Y9R | * | Prefix Unallocated/Not Assigned |
| Y9S | * | Prefix Unallocated/Not Assigned |
| Y9T | * | Prefix Unallocated/Not Assigned |
| Y9U | * | Prefix Unallocated/Not Assigned |
| Y9V | * | Prefix Unallocated/Not Assigned |
| Y9W | * | Prefix Unallocated/Not Assigned |
| Y9X | * | Prefix Unallocated/Not Assigned |
| Y9Y | * | Prefix Unallocated/Not Assigned |
| Y9Z | * | Prefix Unallocated/Not Assigned |
