Accepting New Patients

Marlon Decastro, MD

4.7 out of 5 (57 Ratings)
  • Internal Medicine
Tagalog, English
Primary Address | Office Details

1162 Montgomery Drive

Suite 2

Santa Rosa, CA 95405

Phone: (707) 890-4100

Fax: (707) 476-2237

Medical Groups & Affiliations
  • Providence
  • St. Joseph Health Medical Group
  • St. Joseph Health Medical Network
  • Dr DeCastro is thoughtful, caring, professional and an excellent physician. I am grateful to be under his care.
    I dont think the doctor and I saw eye to eye on a couple of things, he said something I took offense to. Im looking for another primary care doctor.
    On time, full check up and health review. I had been to the emergency room the day before and they wanted me to see my doctor for a follow up.
    This was a first time get acquainted appointment. Dr. Decastro had my records available and was familiar with most of my recent history. Very patient in answering my questions. I felt at ease with him and looking forward if there is future need of his services. At 82 I am sure there will be!
    I have NO bad experience with *Dr. Decastro.
    10 Total Comments Page 1 2   Next
  • Meet The Provider
    As an internist, Dr. DeCastro specializes in providing patient-centered care for adults of all ages. He is board certified in Internal Medicine and able to care for an individual's specific medical needs from preventive services to the diagnosis, treatment and management of acute and chronic conditions and diseases. He is especially adept at treating individuals with diabetes.

    Dr. DeCastro received his medical degree from the University of the Philippines in Manila, and conducted an Internal Medicine residency at Nassau University Medical Center in East Meadow, New York. Most recently, Dr. DeCastro served as an attending physician at Clemson Health Center in South Carolina where he provided primary care to adults and served as lead investigator in several studies. While there, he also earned certification in the Diabetes Physician Recognition Program, presented by the National Committee for Quality Assurance.
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    Primary Specialties
    Primary Specialties
    • Internal Medicine
    Other Specialties Associations Areas of Interest
    Areas of Interest
    Family Medicine, General Practice, Internal Medicine
    Education & Training
    • Medical School
      University of the Philippines
    • Internship
      Nassau Univ Medical Center- East Meadow
    • Residency
      Nassau Univ. Medical Center- East Meadow


  • Primary Location

St. Joseph Health Medical Group - Santa Rosa - Internal Medicine

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