Chronic / Acute medical care on Visitor Visa (B2) in USA

[Wilsock]

My parent (66) needs urgent, medium term (several months) of care for prostate cancer. He lives abroad, but I would like to bring him to the states, California specifically. I have many questions on this process, but would love to know where to start. Two preliminary ones:

1. How do I go about organising this with the institution to take him to? Who / How do I get in touch with a hospital and then plan his care so that he can be seen as soon as possible after we land? Is there a patient care coordinator or other such role who would make this happen?
2. How do I handle the financial portion of this? My dad is uninsured in the States, and being a foreigner (B2 visa), I don't know what kind of help (charity or otherwise) he can access. Is there a way to find this out or make arrangements beforehand? Specifically, we are OK getting on some kind of payment plan, but upfront the costs would be completely unaffordable.

We will be applying for a Green Card (child -> parent sponsorship) soon for my dad, and I would like to know if this process to affect his eligibility for the green card.
Thank you in advance for your consideration and answers.