I work for a practice management firm as a consultant. On top of my base salary, I get 40% profit from the revenue I generate as incentive. Whether it be auditing, educational seminars, etc.
Fees for those services are based on their needs, I calculate time, overhead, etc. Auditing services can start from $500 and my biggest one was $15,000. Depending on how many charts, providers, how often the audits are, etc... I draw up the proposals based on flat per chart rates or hourly... it really just depends on the client and their needs. You need to take it client by client and be reasonable, yet competitive. In the beginning I didn't make one red cent, sometimes you have to charge less to get more.