Madoff has been imprisoned since March, when he pleaded guilty to fraud charges and admitted cheating thousands of investors out of billions of dollars.
The 71-year-old Madoff was arrested a year ago after he confessed to his sons and later to the FBI that his private investment business was a fraud.
He is being treated at the Federal Medical Center, part of the Butner Federal Correctional Complex in Butner.
Butner is near the cities of Durham, Raleigh and Chapel Hill.
