Hi Marc.
Sorry about that, I was working from memory on that report. You are correct on the "Insurance" from the demographics. That gives you insurance name, and the the operator of "<>", and then leave the value field blank. The part I forgot to add in my response is after the report runs, click the "Show all query results" button at the bottom of the screen. That will display the insurance name.
I tried to add a screen shot of the report but the forum is not letting me upload the image.
You can email me at mdabeck@harriscomputer.com if you want more clarification or we can arrange a time for me to call and remote in and work on some reports with you.