If they spent as much time as it would take to orient you to all the nuances of insurances, you'd be on orientation forever. It changes very often as well. The regs can be complicated, not clear cut, interpreted in several ways by different sup's, inconsistencies abound, and it just adds to the complications.
I think the better way to do it is to be sure you are clinically competent, and start you out doing visits, less than everyone else, with 2 hours at the end of the day to review what you did w your supervisor. Tagging along wiht someone else for too long isn't good either, unless you need to learn a procedure or skill, or be observed doing one.
I wish the agencies would just make new people take the on-line training courses for the OASIS and courses like you found. But, it is also hard to apply until you expereince the field work.
In short, I don't think agencies can aford to keep a nurse buddied up for too long, even if in the long run they turn out a better clinician. Most agencies are just making it with very little profit margin, so I imagine that is why. I just bumped into a friend from my old agency in the supermarket. Four nurses slipped on ice and are doing office work only. FOUR!! It's always something, they just barely get the visits covered as it is every day. I don't know what else to tell you. Doesn't make it right, but that is the reality.