On 8.6.2014 I received a call from this number, too. No caller ID. I did not answer and no message was left. Interestingly, I had recently been on the phone with Blue Cross/Blue Shield, as "scamfighter" stated the caller represented themselves, when spoken with.
I spoke with a BSBC rep. 1/9/2014 and received two calls from this number today. I did not answer as I did not recognize the caller. There was no message left from this caller.
received a call form 630-517-0521. Interesting that it's showing "Blue Cross Blue Shield" not exactly spelled out like I've shown but it reads that. And on top of that, they've relayed that number to go to my husband's work number. I didn't answer the call but within a few minutes or less, my husband called from work saying I just called him. I didn't call him.