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.
The likely reason you received a call from this number was due to an attempt at a customer satisfaction survey from SQM Group. SQM Group is a customer service research firm that organizations use to contract out customer satisfaction surveys to. If you would prefer that SQM Group does not call you in the future for any other client we may deal with (over 400+ clients at any given time), you can submit your number to our Do Not Survey list at https://www.sqmgroup.com/do-not-contact/