Sonal Phatak, M.D.

Sonal V. Phatak, M.D.




Internal Medicine


  • Associate Professor


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

Lawrence J. Ellison Ambulatory Care Center

4860 Y St., Suite 100
Sacramento, CA 95817
Driving Directions

Primary Phone:

UC Davis Medical Group - Roseville

1620 East Roseville Parkway, Suite 200
Roseville, CA 95661
Driving Directions

Primary Phone:

Additional Phone Numbers

Clinic Phone: 916-734-2737
Physician Referrals: 800-4-UCDAVIS (800-482-3284)

Clinical Interests

Dr. Phatak has interests in all areas of endocrinology with specific focus on adrenal disorders, bone/calcium disorders, and diabetes.


Endocrinology, Diabetes, and Metabolism

Center/Program Affiliation

UC Davis Medical Group


M.D., UCLA School of Medicine, Los Angeles CA 2003

B.S., Biomedical Sciences, UC Riverside, Riverside CA 1999

Internship: Internal Medicine, Loma Linda University Medical Center, Loma Linda CA 2003-2004


Internal Medicine, Loma Linda University Medical Center, Loma Linda CA 2004-2006


Endocrinology, UC San Diego Medical Center, San Diego CA 2010-2012

Board Certifications

American Board of Internal Medicine,

American Board of Internal Medicine, Endocrinology,

Professional Memberships

American College of Physicians

Associate Faculty Member of Faculty of 1000: Post-Publication Peer Review

The Endocrine Society

Select Recent Publications

Sarikonda G, Sachithanantham S, Pettus J, Rodriguez-Calvo T, Phatak S, Edelman S, von Herrath M. Higher proinflammatory cytokine production and spontaneous activation in some type 1 and type 2 diabetic subjects. Clin Immunol. 2014 Nov;155(1):27-29. doi:10.1016/j.clim.2014.08.007. Epub 2014 Aug 27. PMID:25173803.

Sarikonda G, Pettus J, Phatak S, Sachithanantham S, Miller JF, Wesley JD, Cadag E, Chae J, Ganesan L, Mallios R, Edelman S, Peters B, von Herrath M. CD8 T-cell reactivity to islet antigens is unique to type 1 while CD4 T-cell reactivity exists in both type 1 and type 2 diabetes. J Autoimmun. 2014 May;50:77-82. doi:10.1016/j.jaut.2013.12.003. Epub 2013 Dec 30. PMID:24387802.

Sarikonda G, Pettus J, Sachithanantham S, Phatak S, Miller JF, Ganesan L, Chae J, Mallios R, Edelman S, Peters B, von Herrath M. Temporal intra-individual variation of immunological biomarkers in type 1 diabetes patients: implications for future use in cross-sectional assessment. PLoS One. 2013 Nov 4;8(11):e79383. doi:10.1371/journal.pone.0079383. PMID:24223938.

Fidler MC, Sanchez M, Raether B, Weissman NJ, Smith SR, Shanahan WR, Anderson CM; BLOSSOM Clinical Trial Group. A one-year randomized trial of lorcaserin for weight loss in obese and overweight adults: the BLOSSOM trial. J Clin Endocrinol Metab. 2011 Oct;96(10):3067-77. doi:10.1210/jc.2011-1256. Epub 2011 Jul 27. PMID:21795446.