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About Us

Exceptional Technology Extraordinary Care

Jiva Health has been catering to the medical needs of the Antioch, Concord, Fairfield, Sacramento, Vacaville, and Walnut Creek communities for over four decades. As a premier multispecialty medical clinic, we are committed to providing superior healthcare services with a strong emphasis on disease prevention and management.

Our comprehensive range of medical services includes primary and chronic care, medical weight management, diabetes, podiatry, endocrinology, sleep medicine, adult and pediatric allergy, immunology, and internal medicine. Our team of highly skilled and experienced healthcare professionals works collaboratively to deliver personalized and evidence-based treatments that cater to each patient’s unique needs.

At Jiva Health, we are passionate about providing compassionate and patient-centered care to help our patients lead healthier, happier lives. Our unwavering commitment to excellence has earned us the trust and loyalty of our patients, and we strive to maintain this trust by continuously improving our services and staying up-to-date with the latest medical advances.

Our Services



chronic care

Chronic Care









primary care

Primary Care

Lungs ICON



Sleep Disorders


Weight Loss

Our Providers

Aaron-Ross Jimenez, MD, MPH

Aaron-Ross Jimenez, MD, MPH


Aaron-Ross Jimenez, MD, MPH, a distinguished figure in the field of healthcare, hails from the picturesque region of southern California. His remarkable journey in the medical world began with a unique blend of academic pursuits.
Aiko Loo, FNP-C

Aiko Loo, FNP-C

Sleep Disorder Medicine

Aiko Loo grew up in the Bay Area. She studied at the University of California, Irvine, where she majored in Psychology. She also studied abroad in New Zealand for a year before returning to complete her bachelor's degree. After college, Aiko pursued her interest in nursing by attending Samuel Merritt University in Oakland, where she received her Master of Science in Nursing as a Family Nurse Practitioner.
Alexandra Vasquez, PA-C

Alexandra Vasquez, PA-C

Endocrinology, Internal Medicine

Alexandra (Alex) is a board-certified Physician Assistant who graduated from Chapman University’s Master of Medical Science Physician Assistant (PA) Program. While in PA school, she discovered her interests in primary care, patient education, and chronic care management. She is committed in delivering comprehensive patient care to better promote and advocate for the health and overall well-being of her patients.

Ali Amirzadeh, MD

Allergy, Immunology, Internal Medicine

Dr. Ali Amirzadeh was raised in South Carolina and then moved to California for his postgraduate work. He finished his Internal Medicine residency at UCLA and his Allergy & Immunology fellowship at the UCLA-Veterans Affairs and Children’s Hospital Los Angeles.

Anita Bhat, MD

Endocrinology, Internal Medicine, Obesity Medicine

Dr. Anita Bhat received her medical degree from Ross University School of Medicine and completed her Internal Medicine training at the UCLA-VA Medical Center. She continued to fellowship in Endocrinology at the University of California, Irvine.
Avery Wong

Avery Wong , PA-C

Internal Medicine

Avery Wong was born and raised in the Bay Area. After completing his Physician Assistant degree at Touro University Nevada, he was excited to be able to return to California to give back to the community he grew up in. He is passionate about primary care and is dedicated to helping his patients live happier, healthier lives.
Cheyenne Quach, PA-C

Cheyenne Quach, PA-C

Endocrinology, Internal Medicine, Obesity Medicine

Cheyenne Quach was born and raised in the Bay Area. She completed her physician assistant training at the University of California, Davis, and had clinical rotations in various Sacramento, Redding, and Southern California locations.

Diane Sammut, FNP-BC

Sleep Disorder Medicine

Diane is a family nurse practitioner currently specializing in sleep medicine. She is originally from Shasta County and after graduating from the University of California, San Francisco with her master's degree in Nursing, she returned to the Redding area. Her practice style is patient centered and focuses on educating patients about sleep and how treating sleep problems may benefit them.

Dr. Everett Trevor

Sleep Disorder Medicine

Dr. Everett Trevor is a distinguished pulmonary and sleep medicine specialist with over 50 years of dedicated practice in Redding.  He is a determined and passionate professional who has helped thousands of patients from all over Northern California to find normal restful, and peaceful sleep.

Farinaz Farrahi, MD

Allergy, Immunology

Dr. Farinaz Farrahi grew up in the Bay Area after immigrating to the United States with her family from Iran. She obtained her B.A. from Mills College in Biochemistry and Molecular Biology and her M.D. from Stanford University.
Gerald Austin, DPM

Gerald Austin, DPM


Dr. Gerald Austin, a distinguished podiatrist, has been a Bay Area resident since 1996. He embarked on his graduate education at the California College of Podiatric Medicine in San Francisco, after completing his undergraduate studies at the University of Oregon, where he earned a Bachelor of Science in Biology with a minor in Spanish.
Harpreet Dhillon, MD

Harpreet Dhillon, MD

Internal Medicine

Dr. Harpreet Dhillon has been practicing medicine since 2000 and enjoy taking care of patients and their medical problems. He began his career at Loyola University Medical School in Chicago, IL and completed his Internal Medicine residency at Fairview Hospital, a member of the Cleveland Clinic Health System in Cleveland OH. Dr. Dhillon then joined Washington Hospital in Fremont, Ca in 2000 and has been practicing medicine and taking care of his patients in the hospital as well as in the clinics. He has also held various leadership roles on the medical staff and served as Chief of Medicine from 2013-2015. 

Our Locations


5173 Lone Tree Wy, Antioch, CA 94531


2182 East St, Concord, CA 94520


1620 Pennsylvania Ave Suite B, Fairfield, CA 94533


2300 Bell Executive Lane, Sacremento, CA 9582


2601 Nut Tree Rd Suite B, Vacaville, CA 95687

Walnut Creek

215 Lennon Ln. Suite 200 Walnut Creek, CA 94598


Based on 82 reviews
Mical Uvillu
Mical Uvillu
Trustindex verifies that the original source of the review is Google.
They really are very good and professional, no matter what pandemic or not, they continue with the same attention, integrity and professionalism with their employees, especially with the doctors who are very attentive and also very knowledgeable about diseases and I am glad to live very close to them, about half a mile from the office, main doctor's office.
Tony Hill
Tony Hill
Trustindex verifies that the original source of the review is Google.
For Dr.Mary Katz at Jiva Health Dr. Mary Katz is the physician I saw at Jiva Health. I was diagnosed with severe sleep apnea, and I also was in need of a weight loss program. I had gone to a few doctors before, and this was my last shot in attempts to address these serious problems. When I got to the office I was pleasantly greeted and Dr.Katz was very personable and helpful with all my questions pertaining my health issues. Because of so many variables its a little bit complicated. Dr. Katz listened to me,and offered suggestions and even stayed after hours to help me to adjust my sleep apnea machine as my new one is stuck in a 6-month delay at the Apria manufacturing unit. She took the time to find me a suitable mask for my previous machine and it was made so clear my comfort and needs were truly cared for. The weight program had also been pleasant. She had to evaluate my past issues and was careful to make the right recommendations. The program and prescription she put me on were mild but effective. I'm consistently losing 2-3 pounds a week with no side effects. Overall, I am extremely impressed with the medical knowledge and common courtesy demonstrated by my physician Dr.Mary Katz. I have found it rare to find providers who genuinely cares for the wellbeing of their patients in the way she does. I rate her high on my list and I would 100% recommend Dr Katz to anyone, or already to friends and families medical needs. It’s hard to find as good of an all-around physician as Dr.Katz. Sincerely, Anthony H

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