The American College of Physicians (ACP) is a diverse community of internal medicine specialists and subspecialists united by a commitment to excellence. Internal medicine physicians apply scientific knowledge and clinical expertise to the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. With 161,000 members in countries across the globe, ACP is the largest medical-specialty society in the world. ACP and its physician members lead the profession in education, standard-setting, and the sharing of knowledge to advance the science and practice of internal medicine.