CdA of a bike without rider
There are, but measurements typically will be protocol-dependent (and vary slightly between different wind tunnels). 

For example: 

Here is a link to a comparison done at the A2 Wind Tunnel in North Carolina almost a decade ago, on bicycles standardized to frame and wheels, but without saddle or handlebars. Other protocols may include saddles, handlebars, and the standard wheels and tires provided with the bike. 

Here is a link to a comparison done in 2012-2013 by Trek on their Madone in the San Diego Low Speed Wind Tunnel. Note the differences in protocol.

Here is a link to a Trek whitepaper on their Speed Concept.