How can I get the neurologist to release Father's findings?

With medical POA on HIPPA list neurologist seeks attorney before releasing his findings on my father's mental capacity. I have POA and on listed on HIPPA forms for all his doctors. My dads mental capacity has been on the decline for sometime. His general practitioner informed me my father was diagnosed nearly a year ago with the signs of mild dementia and sent to a neurologist. In the past 4 months my 82 year old father married his girlfriend of 15+ years and has changed his trust several times all to the considerable benefit of his new wife. After a discussion with my father's GP he set up another appointment with my dad's neurologist. I've spoken to the neurologist but he won't release any of his findings. He said he had to speak to his attorney for legal advice before releasing them. That was 3 weeks ago. We are all very concerned about my father's menal capacity recently as his "new" wife continues fleecing him. How can I get the neurologist to release his findings?