The autocad format like dxf dwg or other are only a specific autocad format. most of common mesh format are similar and interchangeable, but when you say Blender to CAD, this mean a lot of thing. Personally I use Blender as CAD, and for exchange file is not always simple and it depend on your needs, for Nurbs CAD there are many ways, for simple mesh planar, you can save the file in fbx, for autocad or dxf with the addon, if you need a nurbs file there are three ways one is using freeship, an other Fusion 360 and the last this Moi3d, all previous this need a mesh ready for the subdivision.
Below some links
Below a CNC simulation on CATIA of file made in Blender and converted to NURBS.
