Always Here For You -- Meet Our Medical Team

Chao Sun, MD, QME

Dr. Chao Sun specializes in urgent care, work related injuries/diseases, and medical-legal disability evaluation.  He also has extensive experience with general medical problems and toxicology. 

In addition to his Medical Degree, Doctor Sun also has a Masters in Public Health from the University of Kansas School of Medicine, Kansas City, Kansas and a BS in Psychology from Washburn University, Topeka, Kansas.

He completed his internship in internal medicine at Yale-Griffin Hospital and completed his residency in Occupational Medicine at West Virginia University Hospital.  After medical training he began his practice in Urgent Care and Occupational Medicine.

Dr. Sun has previously taught for more than five years as an Assistant and Associate Professor in the Department of Family Medicine and Preventative Medicine at the Kansas City University of Medicine & Biosciences (KCUMB) in Kansas City, MO. Prior to joining Express Medicine Urgent Care, Dr. Sun worked as an occupational medicine/urgent care physician for Mercy Medical Group, as the medical director of occupational medicine for Sutter Solano Regional Medical Group, and as the Oakland center medical director for U.S. Health Works Medical Group.

He is Board Certified in Occupational Medicine by the American Board of Preventive Medicine (ABPM). He also is a certified Medical Review Officer (MRO) for drug screening and toxicology, Qualified Medical Examiner (QME) for medical-legal disability evaluation, Civic Surgeon for immigration physical examination, and certified Yellow Fever Vaccine Provider for travel consultation and vaccination.

Eddie C. Cheung, M.D., FACG

Dr. Cheung is a Clinical Professor of Internal Medicine and Gastroenterology/Hepatology at the University of California at Davis, School of Medicine. He is on the Clinical Faculty at the Stanford University, School of Medicine and University of California at San Francisco, School of Medicine. 

He graduated from Taipei Medical University and completed his fellowship of Gastroenterology, Hepatology and Clinical Nutrition at the University of Louisville, Kentucky.

He has been involved in clinical practice, research and teaching in various areas of Gastroenterology and Hepatology for over thirty years, including gastroesophageal reflux, colitis, functional bowel and liver diseases. He is a fellow of the American College of Gastroenterology and International Academy of Proctology.

He was the Director of Hepatology for the Veteran Administration Northern California Healthcare System in Martinez, California.

He is involved on a national and international level in a number of efforts in the fight against liver diseases particularly liver cancer and viral hepatitis. In that regard, he is chairman of the American Liver Foundation’s National Asian Leadership Advisory Council, a group which is a key component of the national program known as THINK B ( The information you need to know about Hepatitis B ). Dr Cheung also acts as co-chair of the THINK B and National Hepatitis B Leadership Conference with Dr. Anna Lok. He has been on the Board of Directors of the American Liver Foundation, Board of Advisors of the Chronic Liver Disease Foundation, Board of Directors of the Federation of Chinese Medical Society and Chinese American Medical Association.

He lectures frequently on various topics of liver diseases, cancer and gastroenterology in the United States and overseas. He recently chaired the US/China Summit on Viral Hepatitis and Liver Cancer. He has published book chapters and co-authored research articles on many subjects, in addition to his involvement in clinical researches. He also serves as the clinical investigator, consultant as well as on the Advisory Board and Speaker Bureau of the Chronic Liver disease Foundation, Asian Health Foundation and various pharmaceutical companies. He is on the Executive Board of the Institute for Translational Hepatology and the California Hepatitis Alliance.

Dr. Cheung was the past president of the Chinese American Physicians Society, where he chairs the hepatitis committee in addition to the organization’s hepatitis education and screening programs. He was also the Chair of the Asian American Pacific Islander Work Team and Board of Directors of the American Cancer Society, California Division. He has been the moderator, speaker and on the International Advisory Board of Hepatology Digest, Asia Pacific Association for the Study of the Liver Annual Meeting and Single Topic Conference on Hepatitis.

He received the Salute to Excellence Outstanding Community Service Award from the American Liver Foundation, Outstanding Contribution to Health Award from the Community Health Charities, the Distinguish Community Service Award from the Salvation Army and the Special Contribution Award from the Department of Veterans Affairs.


Milpitas Office:

145 W Calaveras Blvd. Milpitas, CA 95035

(By appointments only)



Pleasanton Office:

5700 Stoneridge Mall Road Suite 100

Pleasanton, CA 94588



Immigration Physicals:




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