I have been treating a patient for some time. The patient just became eligible for, and is receiving, Medicaid. I don't accept Medicaid, and the patient is willing to pay out of pocket to keep seeing me. Is that legal? 

Certainly. As long as the patient is willing to pay for your services herself, she is free to keep seeing you.

I have been treating a patient for some time. The patient just became eligible for, and is receiving, Medicaid. I don't accept Medicaid, and the patient is willing to pay out of pocket to keep seeing me. Is that legal?