Research their company on the internet.
Ask lots of questions...about their business, how they function, what they look for in employees, whether or not they promote from within.
Ask what a 'normal' day would be like.
Ask about continuing education.
Ask about their committment to compliance.
Are they ready for 5010 and ICD-10? If not, what is the plan?
Ask how the company expects to evolve over the next few years, and how you would fit into that.
Ask what it's like to work for your potential supervisor.
Ask what the current staff would say about management.
Find out what they hope you'll be able to do for them.
Then....explain where you want to be in five years, even ten. Be specific; we all want to be employed, but do you want to be in management? A specialty coder? A compliance officer?
Be professionally dressed. Wear a suit, stockings and carry a copy of your resume and references. Show up on time. Will you be asked to take a test? Bring ICD-9 and CPT just in case.
Be yourself, because managers hate surprises! Be honest...if you don't know how to do something, or don't know the answer, say so, and then go on to say how you'd go about finding the answer.
Good luck!