John Onate, M.D.

John Onate, M.D.


Internal Medicine



  • Professor


To see if John Onate is accepting new patients, or for assistance finding a UC Davis doctor, please call 800-2-UCDAVIS (800-282-3284).

Philosophy of Care

I am strongly interested in collaboration with my patients in treatment of medical and mental health problems, I strongly believe in empowering my patients to be part of their treatment plan.

Research/Academic Interests

Dr. Onate practices both Internal Medicine and Psychiatry at the Sacramento County Health Center, where he currently also acts as medical director of Integrated Behavioral Health. As a faculty member at the University of California Davis School of Medicine he supervises Psychiatry, Combined Internal Medicine and General Internal Medicine residents; addressing the coordination of medical care in uninsured and indigent patients with mental illness and substance disorders.  He is a recipient of the American Psychiatric Association’s Nancy C.A. Roeske, M.D., Certificate of Recognition for Excellence in Medical Student Education. He has published several articles and book chapters in the field of primary care preventative health and psychiatry. He has spoken nationally at on the subject of integration, collaboration in medical and mental health care, addiction medicine, sports psychiatry, and on exercise as a treatment for depression. Dr. Onate has appeared on the PBS medical program “Second Opinion." He is strongly interested in the collaboration and integration of psychiatric care and substance abuse treatment in primary care, HIV medicine and Hepatitis C and exercise in the treatment of mental illness. He is the faculty advisor for the UCDSOM Chapter of the Gold Humanism Honor Society.




M.D., University of Mississippi School of Medicine, Jackson MS 2000

B.S., University of Southern California, Hattiesburg MS 1996

Internship: Combined IM/Psych, Rush University Medical Center, Chicago IL 2000-2001


Combined IM/Psych, Rush University Medical Center, Chicago IL 2001-2005

Board Certifications

American Board of Internal Medicine,

American Board of Psychiatry and Neurology, General Psychiatry,

Professional Memberships

American Psychiatric Association

Association of Medicine and Psychiatry

California Psychiatric Association

Central California Psychiatric Society

Honors and Awards

Central California Psychiatric Society President's Award, 2016

Association for Medicine and Psychiatry Service Award, 2014

APA Nancy C.A. Roeske, M.D., Certi?cate of Recognition for Excellence in Medical Student Education, 2013

Shifa Clinic Preceptor Award-Teaching Award from the Sacramento student run clinic for the uninsured, 2006

Select Recent Publications

Book Chapter. HIV/AIDS.  Study Guide to Preventive Medical Care in Psychiatry. A Case Approach. 2017.ISBN 978-1-61537-057-3 

Book Chapter. HIV/AIDS. Preventive Medical Care in Psychiatry A Practical Guide for Clinicians. 2015.ISBN 978-1-58562-479-9

Xiong GL, Iosif AM, Suo S, Mccarron RM, Koike A, Onate J, Carter CS. Understanding preventive health screening services use in persons with serious mental illness: how does integrated behavioral health primary care compare? Int J Psychiatry Med. 2015;48(4):279-98.

Onate J. Use of Psychiatric Drugs in Patients With Hepatitis C. Psychopharm Review. Vol 45. No 3. March 2010. 17-24.

Onate J, Xiong G, McCarron R. Lippincott’s Primary Care Psychiatry, Book Chapter: The Primary Care Psychiatric Assessment. Lippincott Williams & Wilkins. April 2009 

Onate J, Hales R, McCarron R, Han J, Pitman D. A Novel Approach To Medicine Training For Psychiatry Residents. Acad Psychiatry. 2008 Nov-Dec;32(3):249-54.

Bourgeois JA, Ton H, Onate J, McCarthy T, Stevenson FT, Servis ME, Wilkes MS. The doctoring curriculum at the University of California, Davis School Of Medicine: leadership and participant roles for psychiatry faculty. Acad Psychiatry. 2008 May-Jun;32(6).

Fancher TL, Kamboj A, Onate J. Interpreting Liver Function Tests. Current Psychiatry. 2007 May; Vol. 6(5).  

Onate J, Psychiatric Consultation in Outpatient Primary Care Settings:  Should Consultation Change to Collaboration? Primary Psychiatry, June 2006: Volume 13(6).