1. I go into hospital and come out with 90k bill - I have insurance and I pay my copay of $130. 2. Insurance says "nah, we'll give you 18k" 3. Hospital goes "ok". 4. Hospital writes off as a 72k loss, which essentialy is a "tax deduction". This is good for me, but such a perverse incentive for the hospital.
It seems hard to search on, but it doesn't really look like there are tax benefits from contractual adjustments.