The only way you could actually have a report specific to patients without insurance is to utilize the user codes. Look up under help Setting Up Patients ,Understanding Patient User Codes to see the list. You can also find a pdf file in the Carestream Dental Institute under the catalog and documentation tab.
Let's say I add user code B on all patients who have no insurance. Add a user code on the patient record located on the right side Office information_User Codes When I run any report that allows to include or exclude a user code I am able to bring up the report dedicated to just those patients with the code for that report.