Can a medical facility refuse services solely because the patient could be involved in personal injury litigation?

Yes. A doctor is not required to treat you. Doctors try to avoid patients who have a workers comp case or have been in an accident, as they don't want to get sucked into the mess, and lose money.

Unless the need for medical care is based on a bona fide emergency, the doctor or a hospital can indeed refuse to treat. I do not know of any health care provider refusing treatment merely because someone is involve din personal injury litigation. If you have a personal injury attorney, you ought to talk to him (her) about the right providers to work with. Good luck.

The victim/patient should be working with a personal injury attorney. That attorney can get you to the right kind of medical care.

It sounds like you have no insurance to pay your medical care. If you are looking for a provider to treat you on a letter of protection, that is a promise to pay when your case settles, there are services available. I am assuming you have a good personal injury claim, the person who hit you has been identified and they have insurance coverage. If all this is true, contact a personal in jury lawyer in your area. You can find one on this website.

It seems like your situation maybe somewhat difficult because the accident occurred in CA which means the litigation would also take place in CA. This could be some of the reason why the doctors are not offering treatment under a letter of protection here in Florida. If the situation turns into an emergency, make sure the person seeks emergency medical treatment.