American College of Physicians

The American College of Physicians (ACP) is a national organization of internists — physician specialists who apply scientific knowledge and clinical expertise to the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. ACP is the largest medical-specialty organization and second-largest physician group in the United States. Its membership of 143,000 includes internists, internal medicine subspecialists, and medical students, residents, and fellows.