You definitely should contact your insurance company, and here's why.
When physicians sign a contract with an insurance company to agree to see those patients (usually at a set fee), they are bound to follow all published and required coding guidelines. If your doctor's office is billing inappropriately, this is a violation of their contract with the insurer. There's no reason why you should get stuck in the middle, and if I were you, I'd make a fuss. A big fuss. Believe me, your insurance company will be all over that employee like a cheap suit. Why should you be responsible for your physician's poor billing practices?
The doctor's employee's response was absolutely outrageous. By refusing to send a corrected claim, because she "doesn't know how to refund the money", is a line of bull...... I am confident that the insurance company will make it crystal clear, by sending a letter to your doctor's office, demanding re-payment. What the heck planet is this person on, anyway?
Let me know how this goes for you. good luck. PammieJ.