FYI. The canadian code (CSA A23.3-04) added a provision (article 7.6.5.8) for reinforcement in the top of a pedestal as well.
However, the only option given is 2#10M bar size (produced in Canada).
Here, 10M bars are between #3 and #4 bars, but from what I can see 10M bars are the same as #3...