Mrs. swsig and I just returned from our neighborhood Walgreens where we attempted to get our flu shots. The pharmacy clerk filled out the documents on their computer, but when she entered our Medicare numbers, the Walgreens system would not take them. Instead it required that we provide the old cards with the social security-based numbers. The ones that we were told to destroy because they became invalid on January 1 of this year. Even if we still had our old cards, and had been able to get our shots, I doubt that Medicare would pay Walgreens when they submitted the claim, because the old numbers won't work. How could a major health care organization screw up like this? They had many months to prepare their computers for the new Medicare numbers for flu shots, yet it apparently didn't get done. Has anyone else had this happen?