The American College of Physicians (ACP) is a national organization of internists—physicians who specialize in the diagnosis, treatment, and compassionate care of adults across the spectrum from health to complex illness. Founded in 1915, ACP is the largest medical-specialty organization and second-largest physician group in the United States. Its membership of 161,000 includes internists, internal medicine subspecialists, and medical students, residents, and fellows. ACP's mission is to promote the quality and effectiveness of health care by fostering excellence and professionalism in the practice of medicine. They are a leading publisher of medical information, including the Annals of Internal Medicine.
Serves as the primary administrative hub, overseeing membership services, educational program development, policy advocacy, and the publication of medical journals and guidelines.
Located in the historic Independence Mall area, reflecting its long-standing presence and commitment to the foundations of American medicine. The building is designed to facilitate collaboration and support the organization's diverse functions.
A professional, mission-driven environment focused on advancing internal medicine and supporting its members. Emphasis on collaboration, evidence-based practices, and continuous learning.
The Philadelphia headquarters is pivotal for coordinating national initiatives, developing clinical guidelines, and engaging with medical professionals across the country to improve patient care.
While primarily a U.S.-based organization, ACP has a significant international membership base with members in more than 140 countries outside the U.S. and Canada. It supports internists globally through international chapters, educational resources like Annals of Internal Medicine (which has a global readership), international meetings, and by promoting high standards of medical care worldwide. ACP also offers international fellowship (FACP) and mastership (MACP) recognitions.
190 N Independence Mall W
Philadelphia
PA
USA
Address: 25 Massachusetts Ave NW, Suite 700, Washington, DC 20001
To represent the interests of internists and their patients at the federal level, influencing healthcare legislation and regulations to improve the quality and accessibility of care.
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As of April 2025, American College of Physicians' leadership includes:
American College of Physicians has been backed by several prominent investors over the years, including:
Key leadership transitions at ACP typically involve the annual rotation of elected physician leadership roles such as President and President-elect. In April 2023, Dr. Omar T. Atiq became President, and Dr. Isaac O. Opole became President-elect. No major unexpected hires or exits for senior staff executive positions like CEO/EVP were prominently reported in the last 12 months.
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The American College of Physicians primarily uses the acponline.org domain for its email communications. Common formats include the first initial followed by the last name.
[first_initial][last]@acponline.org
Format
dmoyer@acponline.org
Example
80%
Success rate
ACP Newsroom • February 29, 2024
ACP and Annals of Internal Medicine published a new joint series of papers and an editorial calling for action to address the ongoing challenges of Long COVID, emphasizing the need for more research, clinical guidance, and support for patients....more
American Heart Association News • November 9, 2023
The American College of Physicians, American Heart Association, and American College of Cardiology jointly released a new clinical guideline for managing cardiovascular disease in adults with type 2 diabetes, published in Annals of Internal Medicine and Circulation....more
ACP Newsroom • April 29, 2023
Dr. Omar T. Atiq, FACP, a medical oncologist from Little Rock, Arkansas, was installed as President of the American College of Physicians during Internal Medicine Meeting 2023. His term began at the conclusion of the meeting....more
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