Sure-

In Excel, type a formula in a new colum to string together x,y,z values. In Cell D1 that would be '=B1&","&A1&","&C1'. Copy the formula down for all points. Should give you point data in proper format.

Then in AutoCAD type "multiple" "point", then copy the point data from column D, all in one shot, and paste into AutoCAD's command line. Then terminate point command with an "esc". You should now have all your points in the drawing.

HTH!