The people who gave out the figure of a trillion dollars were talking about an incomplete early draft of a proposed bill. It did not include quite a lot of very important and relevant information and features that, when included in their calculations, will produce a very different figure. The whole point of sending that early draft was to get a projection from that government agency of how some of the features of the early draft would impact the cost. It was not a final version and it didn't look anything like what either Obama, or the Democrats in the House and Senate have been proposing.
Here is one expert who says that health care reform as proposed by Obama will reduce the deficit, whereas not taking care of the problems that Obama's proposal addresses will cause the deficit to increase. I've seen others and I'll post them as I get time...
David Cutler is Otto Eckstein Professor of Applied Economics at Harvard University.