Hi - I am new here and found your post. I have been an RN for over 20 years. I work as a UM Reviewer. It's definitely a specialty. Basically you learn the Health Plan criteria and systematically apply this knowledge to the medical records you are reviewing. Once your review is complete, you make a decision to approve, pend, deny, or send to the Medical Director(s) for further review.
It is mostly straight-forward but of course there will always be out of the norm cases. Good luck to you!