When Medco calls you, it should show up on your caller ID as Medco. They have called here many times. The phantom calls here too, but doesn't say anything when either my wife or I answer. So we can rule out breathers, or perverts. Caller ID is WYCKOFF,NJ
Got a call from an unfamiliar number today. It was a lady with an obvious accent asking me to call 866-546-8145 regarding one of my prescriptions. Not recognizing the number she called from or the 866 number, I called Medco directly. They checked my file and found that a call indeed HAD been placed by Medco for me to contact them. It turned out it was a reminder that one of my prescriptions was showing overdue for a refill.
I've confirmed this is a GOOD number, and the Medco rep I talked to at the known good Medco number on the back of my card did confirm the 866-546-8145 is also a valid Medco number that goes straight to the prescription department.
Again, this is a GOOD number for Medco and NOT a scam. Unless of course you don't care about running out of your prescriptions... ;)