Careers With St. Joseph Health

Our Values are more than just words.

They form the heart and soul of St. Joseph Health and are the prime reason we attract and retain high-caliber employees who believe in the sanctity of their work in our faith-based setting.

Recent News

Irvine school nurses, staff learn Stop the Bleed techniques to respond in mass-casualty situation

Irvine school nurses, staff learn Stop the Bleed techniques to respond in mass-casualty situation

| Contributor: OC Register Read More
Families anticipate exciting community blessing of surgical center

Families anticipate exciting community blessing of surgical center

| Contributor: Plainview Daily Herald Read More
Severe Flu Season Tightens Its Grip on U.S.

Severe Flu Season Tightens Its Grip on U.S.

| Contributor: WebMD Read More

Here you can find news articles and press releases from St. Joseph Health and it's locations.

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.

Giving back to the community. St. Joseph Health System Office

Marlon DeCastro, MD

4.6 out of 5 (92 Ratings)
Specialty
  • Internal Medicine
Additional Language Spoken
Tagalog
Address
Internal Medicine – Doyle Park Suite 303
500 Doyle Park Dr.
Suite 303
Santa Rosa, CA 95405
Accepting New Patients

Primary Office

Address
Internal Medicine – Doyle Park Suite 303
500 Doyle Park Dr.
Suite 303
Santa Rosa, CA 95405
Get Directions
Phone
(707) 303-8300
Fax
(707) 303-8301

More Information

Website
www.stjosephhealth.org
Medical Groups & Affiliations
  • St. Joseph Health Medical Group
  • Meet The Doctor

    Specialties & Education

    Primary Specialties
    • Internal Medicine
    Education & Training
    • Medical School
      University of the Philippines- Manila, Philippines
    • Internship
      Nassau Univ Medical Center- East Meadow, NY
    • Residency
      Nassau Univ. Medical Center- East Meadow, NY
    Areas of Interest
    Family Medicine, General Practice, Internal Medicine
  • Biography

    Biography

    Biography
    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.
    Certifications
    A.B.I.M.