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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.

Marion L. Guyer, MD

4.7 out of 5 (63 Ratings)
  • Internal Medicine
    (Board Certified)
Additional Language Spoken
Medical Groups & Affiliations
  • St. Joseph Health Medical Group
  • St. Joseph Health Medical Network
St. Joseph Health Medical Group
905 East Washington Street
Petaluma, CA 94952
Accepting New Patients

Primary Office

St. Joseph Health Medical Group
905 East Washington Street
Petaluma, CA 94952
Get Directions
(707) 763-9891
(707) 762-2311

More Information

  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Internal Medicine
      (Board Certified)
    Education & Training
    • College
      Presidio Graduate School - 2010
    • Medical School
      University of California, San Francisco - 1997
    • College
      University of California, Berkeley - 1990
    • College
      Yale University - 1984
    • Internship
      Alameda County Medical Center - 1998
    • Residency
      Alameda County Medical Center - 2000
  • Biography



    Chief of Hospitalist Medicine
    Assistant Medical Director for Care Transitions
    Attending Physician, Inpatient Medicine

  • 23-Jun-2019
    this visit was to establish care as our primary care doctor moved out of the area. I was very pleased with the visit.
    kind caring
    Personnel and Dodtot were pleasant and helpful.
    I went to see *Dr. Marion Guyer to introduce myself. To see if she could possibly by my new PCP. Since *Dr. Lana Nguyen is retiring as a family doctor. *Dr. Marion Guyer was very nice - a good listener - Compassionate - so now she is my new PCP.
    27 Total Comments Page 1 2 3 4 5 6   Next