General and colorectal surgeon, Brian Hinnebusch, MD, recently joined Emerson Hospital and is accepting new patients. Dr. Hinnebusch, along with his colleagues, Drs. Atif Kahn and Elizaveta Ragulin Coyne, sees patients at the Walden Surgical Associates office located at 131 Old Road to Nine Acre Corner, John Cuming Building, Suite 500 in Concord.