1973: ACVIM received probationary approval from the American Veterinary Medical Association. The ACVIM's Constitution and Bylaws were approved during the AVMA convention in Philadelphia that same year. Full recognition of ACVIM by the AVMA was achieved in 1980.

1981: A central office was established in Blacksburg, Virginia, to manage the rapid growth of ACVIM. In 1993, the office moved to Lakewood, Colorado. From the outset, ACVIM adopted an "umbrella principle" to accommodate various specialty groups including Cardiology, Neurology, Internal Medicine and Dermatology.

1982: The dermatology group withdrew from ACVIM and established the American College of Veterinary Dermatology.

1983: The First Annual Veterinary Medical Forum was held in New Orleans. The ACVIM Forum has evolved into one of the veterinary profession's premier continuing education events.

1987: ACVIM published the inaugural issue of the Journal of Veterinary Internal Medicine (JVIM). Published as a bi-monthly, print journal through 2014, JVIM will become an online, open access journal as of January 1, 2015.

1988: Following approval by the AVMA, Medical Oncology was added to the ACVIM.

2002: The Internal Medicine specialty was split into two more specific groups; Large Animal Internal Medicine and Small Animal Internal Medicine.

2010: ACVIM added Advanced Continuing Education (ACE) courses to provide CE credits and training at a level appropriate for Diplomates and Candidates.