- California Medical Association
 - Organisation of physicians formed in the interest of patient protection and quality of care. - California Healthcare Institute (CHI)
- Researches, develops, and advocates policies and actions that promote biomedical science, biotechnology, pharmaceutical, and medical device innovation in California.
- American Medical Writers Association - Northern California Chapter
- Information for professional medical and technical writers and biomedical communicators.
- California Society of Periodontists
- News, events, and statewide directory of periodontists.
- California Oncology Consortium
- Provides information, education, and guidance to its members specialising in haematology and medical oncology and to the public.
- California Academy of Physician Assistants
- California Children's Hospital Association
- Nonprofit group that advocates for children's health care in partnership with California children's hospitals.
- California Health Information Association
- California Society of Plastic Surgeons
- Directory of American Board certified plastic and reconstructive surgeons.
- California Association of Acupuncture and Oriental Medicine
- Promoting the ethical, skilled, and caring provision of acupuncture and oriental medicine services.
- Western Society of Periodontology
- Includes membership information, meeting schedule, and links.
- California Chiropractic Association (1)
- Hospital Council of Northern and Central California (HCNCC)
- Nonprofit hospital and health system trade association representing a range of facilities from small, rural hospitals to large, urban medical centres.
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