If you check the file formats in the DXF-DWG Translation Setup Dialog, you will see that they are in 3-year increments.
This is something Autodesk has been doing in the last many years: they change the file format every 3rd version.
So the AutoCAD 2013 format is used by AutoCAD 2014 and AutoCAD 2015 as well.
So the only item currently missing from that list is AutoCAD 2016.
Now, AutoCAD 2016 came out a few months ago. Graphisoft, as many other software vendors, is using the DWG Libraries of the Open Design Alliance (ODA). But it usually takes some time after a new AutoCAD version comes out for the ODA to be able to create these libraries so software vendors can implement them.
So my prediction is that probably "AutoCAD 2016" will be among those choices at some point in the future, maybe in one of the next AC19 updates/hotfixes.
Regardless of this, I think you will be just fine saving in AutoCAD 2013 format. Consultants using later AutoCAD versions should be able to open those files just fine.
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