Thanks to everyone who has called me and offered me advice on this! I ended up calling Aetna and appealing their decision to not pay for my anesthesia. The girl on the phone was very nice and understanding and helped me submit my appeal over the phone. She told me it would take 30 days to get an answer. I then called the medical billing office and explained the situation to them. The girl there was also very nice and understanding and told me that they would also appeal the decision. She told me that it wouldn't be a problem to get it covered. A couple days later I got a letter from Aetna (dated the day after my appeal!) stating that they had reversed their decision and would pay the full cost.
Hooray! That wasn't so hard...I wonder why they even made such a fuss over it in the first place if it was that easy. :P