If a Practice Has Not Accepted Assignment, and Collects Payment

If a practice has not accepted assignment, and collects payment from the patient at the time of service and then sends a claim to the plan on behalf of the patient, what should the patient expect as the next course of action?

A) receive a bill for the remainder
B) receive a reimbursement check from the insurance company
C) if a practice has not accepted assignment, they wouldn't be able to send a claim
D) if a practice has not accepted assignment, they wouldn't be able to see the patient