Final answer:
The main idea of the new policy notice at Good Haven Hospital is that patients are required to set up a payment plan.
Step-by-step explanation:
The main idea of the new policy notice at Good Haven Hospital is that patients are required to set up a payment plan. The notice does not mention anything about patients needing to be citizens of the USA or having health insurance. It also does not specify that anyone can be a patient as long as they can prove identity, income, and family size. Additionally, the notice does not state that anyone can be a patient if they provide family size and income, but only for one year.