Established in 1933, the American Board of Medical Specialties (ABMS) is a non-profit organization which represent 24 broad areas of specialty medicine. ABMS is the largest and most widely recognized physician-led specialty certification organization in the United States. The other certification organizations in the United States are the American Board of Physician Specialties (recognized in parts of the United States) and American Osteopathic Association Bureau of Osteopathic Specialists.
 ABMS Member Boards have maintained a rigorous process for the evaluation and Board certification of medical specialists, though none of the processes have been confirmed by independent third-party review. They certify specialists in more than 150 medical specialties and subspecialties. More than 80 percent of practicing physicians in the United States have achieved  Board Certification by one or more of the ABMS Member Boards. The Member Boards support lifelong learning by physicians through the ABMS Maintenance of Certification (ABMS MOC) program. ABMS also collaborates with other professional medical organizations and agencies[vague] to set standards for graduate medical school education and accreditation of residency programs. ABMS makes information available to the public about the Board Certification of physicians and their participation in the ABMS MOC program.
 Since 1934, specialty boards were considered for membership in ABMS according to the standards set in the
"Essentials for Approval of Examining Boards in Medical Specialties" created by ABMS and the American Medical Association Council on Medical Education (AMA/CME). In 1948, these efforts were formalized through the establishment of the Liaison Committee for Specialty Boards (LCSB), which is made up of representatives from ABMS and AMA/CME. Broadly stated, a medical specialty examining board must:
 Board Certification and the ABMS Program for Maintenance of Certification (ABMS MOC®) are highly-visible indicators that physicians know today's standards of practice. The ABMS Program for MOC activities emphasize ongoing professional development and assessment that is aligned with other professional expectations and requirements within health care.
 The information below provides an overview of the requirements for initial Board Certification and MOC. To learn more about the requirements for a specific specialty, contact the particular ABMS Member Board.
 Physicians can demonstrate their expertise in a medical specialty by earning Board Certification through one of the 24 ABMS Member Boards. Before physicians can become Board Certified, however, they must first:
 Once Board Certified, physicians maintain their medical specialty expertise by participating in a robust continuous professional development program called the ABMS Program for MOC. The MOC program provides physicians a structured approach for enhancing patient care and improving patient outcomes through focused assessment and improvement activities.
 The ABMS Program for MOC involves ongoing measurement of six core competencies defined by ABMS and ACGME:
 These competencies, which are the same ones used in the ACGME's Next Accreditation System, are measured in the ABMS Program for MOC within a four-part framework:
 All Programs for MOC implemented by the Member Boards measure the same six competencies within the same four-part framework. While these elements are consistent across all Member Boards, what may vary, according to the specialty, are the specific activities the Member Boards use to measure these competencies. Despite some variation in the activities, they are all built upon evidence-based guidelines, national clinical and quality standards, and specialty best practices.
 ABMS was incorporated in 1933. This list shows the year each board was approved as an ABMS Member Board.
 Founding Members
 1935
 1936
 1937
 1940
 1941
 1947
 1949
 1969
 1971
 1979
 1991