The American College of Osteopathic Internists (ACOI) is dedicated to promoting high quality, distinctive osteopathic care for adults by practicing, educating and empowering physicians in principle-centered medicine. Since 1941, the ACOI demonstrates leadership as an organization providing osteopathic internists with education, forward thinking information and opportunities for service to the profession to advance the practice of internal medicine. Stay true to why you pursued medicine. Join the community of osteopathic internists. ACOI represents internists, internal medicine subspecialists, medical students, residents, and fellows.