How do you prioritize your tasks?
How would you send an email to a client for x,y,z?
Give me a time you had to be accountable for a project.
Explain to me a time you were given a project with no guidance and the steps you took to succeed.
What do you think is the most important thing a billing person should have ?
Give me an example of the thing where you find is most challenging for a billing officer when managing billing queries