Barnhart is out of the lineup for Tuesday's game against the Brewers.
With Cincinnati facing a lefty starter (Brett Anderson) for the second straight day, the lefty-hitting Barnhart will once again cede catching duties to the righty-hitting Tyler Stephenson. Right-hander Freddy Peralta is scheduled to take the hill Wednesday for Milwaukee, so expect Barnhart to pick up his first start of the series that day.