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About St. Joseph Health

SJH provides a full range of care facilities including 16 acute care hospitals, home health agencies, hospice care, outpatient services, skilled nursing facilities, community clinics and physician groups. All of our hospital and home health entities are accredited by the Joint Commission. In our award-winning facilities, SJH maintains a "continuum of care," matched to the diverse needs of the urban centers, smaller cities and rural communities who depend on us every day.

Tom Guyn, MD

  • Hospital Medicine
Additional Language Spoken
NCMA Internal Medicine - Santa Rosa
3536 Mendocino Avenue
Suite 300
Santa Rosa, CA 95403

Primary Office

NCMA Internal Medicine - Santa Rosa
3536 Mendocino Avenue
Suite 300
Santa Rosa, CA 95403
Get Directions
(707) 546-2180
(707) 546-2188

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Hospital Medicine
    Secondary Specialties
    • Internal Medicine
    Education & Training
    • Medical School
      University of Rome
    • Internship
      Worcester City Hospital
    • Residency
      New Britain General Hospital
    Areas of Interest

    Hospitalist, Hospitalist, Hospitalist Medicine, Internal Medicine

  • Biography



    Dr. Tom Guyn has been a Hospitalist with Santa Rosa Memorial since 2009. Dr. Guyn returned to his home state of California after having worked and lived in both Minnesota and Germany several years. As a Hospitalist, Dr. Guyn is dedicated to caring for patients during their hospital stay and providing the communication necessary to return care to the primary care physician once discharged from the hospital setting. His career has taken him from private practice and consultant services to acute care medicine.

    Dr. Guyn has an interest in environmental health and has earned a Masters of Arts in Values and the Environment (MAVE). Dr. Guyn is an active on several Medical Staff committee including the Physicians Advisory Committee (PAC) designing the development and safe transition to an electronic medical record.

    Dr. Guyn attended Chico State for his undergraduate work, then UC Santa Barbara for graduate studies in Genetics and protein structure. He then traveled to Rome for Medical School, where he later met his wife. Dr. Guyn and his wife now reside in Santa Rosa and have 2 children. His interest includes running, pottery, Taekwondo (a Black Belt), opera, ballet and the Great Works.

    Internal Medicine