So sorry about
your friend, but a question back to you, is he on disability, if not why not, he could be on Medicare and at least 80% of his insurance problems would be over. Also, I think the age to qualify for Social Security, which will include medicare is 65, I am not sure, I had heard it was going to 67, but that may be aways away.
Also, he is definetly qualified for AARP, he might check with them and see what insurance they can offer him now. I am along way from California, so cant help you with the doctor thing, but you can check on him in other ways, check his rating with the AMA. It might help.