We have a few patients with the same situation. I would love to know as well. I end up having to hand write a claim form and send thru mail.
The following is the recommended process when a patient is covered by more than two insurance plans.
PracticeWorks only permits two dental insurance companies (a Primary and a Secondary) on each Clipboard.
The user will have to manually submit the claim to the Third Insurance and include copies of each EOB (Explanation of Benefits) from both the Primary and Secondary insurance companies.
Note: The remaining benefits for the Secondary Insurance will not be accurate.