I don't understand why you think you need a criminal defense or appeals attorney. What are you trying to do? Get information on his condition? Sue the facility for his injuries? Get him released early?
You say your brother was serving time in a Federal Correctional Institution (FCI), which is a low-to-medium security prison, and was close to release. If he was the victim of an attack and is not being charged with a new crime, he does not need a criminal defense attorney.
Please explain exactly what kind of help you want.
Yes the first thing is go see him. The next thing is find out who beat him? Was it the guards or other inmates. When you visit him you can have him sign a HIPPA release giving his family the right to his med records. Any questions you may call me. Good luck!!