Here's a link to a CPT "Coach":
http://home.midmaine.com/~mtpmd/PsychCodeCoach.html
It walks you through a checklist that allows you to determine the code for each session. I played around with it a bit, and I personally found it cumbersome and more time-consuming than just writing my note after familiarizing myself with the guidelines.
But some people might find it useful, so check it out.