(Last Updated On: November 9, 2022)


National Internal Medicine Day recognizes the impact of approximately 300,000 Internal Medicine Physicians on October 28.


Internal Medicine Physicians, also known as internists, are the cornerstone of comprehensive health care. They are experts in complexity who see every connection in the adult human body. They serve, and lead, in a variety of settings. Their expertise is vital to patients, medical professionals, and health care.

What do Internal Medicine Physicians do? Internal Medicine Physicians specialize in adult medicine. They are specially trained to solve diagnostic problems, manage severe long-term illnesses, and help patients with multiple, complex chronic conditions. They see the big picture, and their deep training and knowledge give them a unique perspective of how everything works in unison. They provide comprehensive, longitudinal patient care and have life-long relationships with adult patients. Often, other medical professionals call upon Internal Medicine Physicians for their ability to connect the dots, help solve problems, and identify solutions.

Some Internal Medicine Physicians also pursue additional training to subspecialize in a specific area of internal medicine. This specialized training includes:

  • Cardiology
  • Endocrinology
  • Gastroenterology
  • Rheumatology
  • Infectious disease

Internal Medicine Physicians serve and lead in a variety of settings, such as private practices, clinics, hospitals, and health systems. Conducting research, teaching in medical schools and residency programs are a few areas internists offer their expertise. They also hold leadership positions in business, technology, and government settings.

Significant Contributions

As the foundation of clinical care, Internal Medicine Physicians have made significant contributions to the health care industry, both in public and private sectors. Some notable contributions include:

  • Noble prize winners for groundbreaking research in dialysis, genetics and cardiac factors, and peptic ulcer disease.
  • Groundbreaking HIV/AIDS research.
  • Development of innovations in treating chronic illness.
  • Leaders in infectious disease prevention, diagnosis and treatment.


  • Visit the  American College of Physicians (ACP) website to learn more about internal medicine and Internal Medicine Physicians.
  • Explore printable and shareable social media content on ACP’s National Internal Medicine Day webpage.
  • Celebrate and share why you are proud to be an Internal Medicine Physician.
  • Tell the world why you are vital to patients, medical professionals, and the health care system.
  • Share and comment on social media about the impact you are making and use #NationalInternalMedicineDay, #IMProud and #IMPhysician while posting.



National Internal Medicine Day was established in 2019 by the National Day Calendar and the American College of Physicians (ACP) to recognize the contributions of internal medicine physicians who are united by a commitment to excellence around the globe. Representing approximately 160,000 Internal Medicine Physicians, the ACP consists of internal medicine specialists, subspecialists, and medical students. In fact, the organization is the largest medical-specialty society in the world, and its mission is to enhance the quality and effectiveness of health care by fostering excellence and professionalism in the practice of medicine.

About American College of Physicians

Founded in 1915, the ACP promotes the science and practice of medicine. Since its founding, the ACP supports Internal Medicine Physicians in their quest for excellence and shares the most updated medical knowledge. In addition, it also offers top-notch educational resources, practice resources, and demonstrates their commitment to internal medicine and those who practice it. The physicians of ACP lead the profession in education. Through a standard-setting, they share knowledge to advance the science and practice of internal medicine.

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