I can't find an address for out of state blue cross claims.
This is what we use for out of state (CA) Blue Cross and Blue Cross / Blue Shield:
Blue Cross
P.O. Box 1505
Red Bluff, CA 96080-1505
Blue Cross at P.O. Box 60007 will sometimes tell you to send the out-of-state Blues to them. But, when you do, they just turn around and send it to the address I listed above. Cut out the middle man and just send the out-of-state Blues to Red Bluff.
Come back with any other questions.
Where are you, by the way?