Lahey Hospital & Medical Center is a physician-led, nonprofit group practice providing quality health care in virtually every specialty and subspecialty, from primary care to cancer diagnosis and treatment to kidney and liver transplantation. The Lahey Hospital & Medical Center health care system is comprised of medical centers in Burlington, Lexington, and Peabody, Mass., as well as more than a dozen community primary care and satellite specialty care locations throughout northeastern Massachusetts and southern New Hampshire.