Well I would think the of documentation would greatly affect productivity more so than the specialty.
Also the system speed you are working with plays a part.
I can audit/code fairly quickly and if I was looking at paper records (already printed) that were dictated, 285 would be no problem and I could probably do more since I know my doctors documentation so well.
Now, if it is handwritten and I have to go find it whole different story. Our system is never quick on a good day, on a bad day it can take more than 15 minutes to pull a chart up and find your note.
What type of documentation are you working with? Is that part of the productivity issue? I know in our ER they have the charts in front of them so the access to info is much greater than myself who has to go thru EMR.
I am assuming it is all E/M since you posted here. E/M is the same for all specialties, the only difference is how the key components are applied and that is based on code set. Another thing to help with productivity is once you know your providers style and the services they are providing you can audit from the weakest part of the note to the strongest which should save time. If you start from the first word and read/level everything in the note it takes awhile. If you know your provider is doing an admit and generally doesn't hit a comphrensive exam, start with the exam. If it is only detailed you only need to make sure the rest of the note supports that level since admits are 3 of 3. That way you aren't wasting time looking for 10 ROS or what not when it ultimately won't matter.
Hope this is helpful,
Laura, CPC, CEMC