Robert Olson was seen two months ago, Robert's mother is on the phone asking why she is receiving a bill for this visit. She indicated during the conversation that Robert is covered by both her insurance and her ex husband, so that shouldn't be any balances due.

1. What could have cause her to receive a bill for this service?

2. What kind of proactive action can you take to avoid such issues in the future with the Olson's and with other patients