honestly, I have all my insurances set to accept assignment. in the past, if I had "no" marked, the oon's would send the payment to the patient. all my oon's said that if i marked as "yes", payments would come to provider and because npi shows oon, we can charge the remainder to patient after whatever insurance pays. now, this may be incorrect, i have seen both ways, but our documentation from the oon's says to do this for provider to get payment instead of patient.