866-427-7476

This was an automated message stating they are from "CVS Caremark with important information about your account."
First, they ask (for verification purposes) your full date of birth including month, day, and year, then they say that that that information does not match their records and then the ask you to enter in your full zip code.
At that point I became suspicious that this was some kind of identity theft phishing scam, so I hung-up and called CVS Caremark directly and ask about this number. CVS Caremark said that they did not call me and there is nothing wrong with my account.
This is an identity theft phishing scam. Do not answer at all costs.