For the Self Dependent record, it pulls from the ACA codes attached to the benefit plan. If you do not want it covered, you remove the ACA codes on the benefit and put it to None.
I have this covered in my ACA documentation and ACA video as well.
Thanks
Terry Heley
Microsoft
Here is my blog and video if you have not seen it.
https://youtu.be/gAeLUjozhUA
Blog
https://community.dynamics.com/gp/b/dynamicsgp/archive/2015/11/25/gpye2015aca