By the time a patient arrives in an emergency room with chest pain, nobody asks whether the physician caring for them trained in an allopathic (M.D.) medical school. The historical development of accreditation for undergraduate medical education in the U.S. began around 1847 with the establishment of the American Medical Association (AMA). In 2020, graduate medical education successfully transitioned into a single accreditation system under the Accreditation Council for Graduate Medical Education (ACGME). The two accrediting bodies that currently govern allopathic and osteopathic medical education cannot act alone.