German to English Bus/Financial Medical: Pharmaceuticals pharma

In a coaching and evaluation form for sales reps

The category is
Kenntnis der Arztpraxis

The first entry is
*Scheinzahl* / Privat-Patienten

What bothers me is that the pair isn't "Kassenpatienten / Privatpatienten".

Is there a difference in billing that makes it lucrative to count the "Schein" from Kassenpatienten and merely count the number of heads among private patients?

Thanks for any enlightenment.
Terry