American Medical Association - AMA
Journals, research, medical ethics, membership information
http://www.ama-assn.org/

American Society for Laser Medicine and Surgery
Dedicated to promoting research, education and high standards of clinical care in the field of medical laser applications.
http://www.aslms.org

American Lung Association
Oldest voluntary health organization in the United States, with a National Office and constituent and affiliate associations around the country. Founded in 1904 to fight tuberculosis, ALA today fights lung disease in all its forms, with special emphasis on asthma, tobacco control and environmental health.
http://www.lungusa.org

American Medical Publishers' Association
Provides for the exchange of information among its members, hosts continuing education seminars, publishes a newsletter, and represents the industry for important issues facing medical publishers today.
http://www.ampaonline.org/

American Society for Reproductive Immunology
An organization dedicated to advancing the study of the immunological aspects of the reproductive process.
http://theasri.org/

American Society of Extra-Corporeal Technology
Nonprofit association providing continuing medical education services and professional support to perfusionists and extracorporeal technologists.
http://www.amsect.org/

American Board of Hospital Physicians
Certifies and recognizes those physicians whose excellence in hospital practice has brought honor to those hospitals in which they have served.
http://www.abohp.org/

American Association of Physician Specialists
Represents thousands of physicians in all specialties. AAPS's professional societies include dermatology, gynecology, and radiology.
http://www.aapsga.org/index.html

American College of Surgeons
A scientific and educational association of surgeons that was founded in 1913 to improve the quality of care for the surgical patient by setting high standards for surgical education and practice.
http://www.facs.org

American Medical Group Association
Trade association representing approximately 300 multi-specialty medical group members composed of approximately 67,000 physicians
http://www.amga.org