Ummmmm.....Guys? It's called the HIPPA Act, and his medical condition is none of your/our business, if he doesn't want it to be. We ALL are protected by it. NO ONE gets to delve into our medical history unless given specific written consent by the patient.
Now, if you don't believe he should also be protected by U.S. law........remember he IS a civilian, now.
And if the doctor does answer questions about Joe Biden's condition(s), then he can be brought up on charges, prosecuted, and lose his medical license, all because YOU think you need to know? I think not......give him the same legal considerations that you would demand for yourself.
Roger