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Internists with Great Reviews in Diamond Bar, CA

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Verified Internists in Diamond Bar, CA

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310 providers

Availability last updated 11/05/2026

Healthcare specialist
Jun-Ichi Ohara, MD, PhD Gastroenterologist
23.2 mi
22 Odyssey
Ste #175
Irvine, CA 92618

Jun-Ichi Ohara, MD, PhD

Gastroenterologist

22 Odyssey
Ste #175
Irvine, CA 92618

Healthcare specialist
Karen Kim, MD Internist
23.4 mi
573 S Boyle Ave
Los Angeles, CA 90033
+3 more locations

Karen Kim, MD

Internist

573 S Boyle Ave
Los Angeles, CA 90033

Healthcare specialist
Gregory Robertson, MD Internist
23.9 mi
20311 S.W. Acacia Street Suite #140
Newport Beach, CA 92660
+6 more locations

Gregory Robertson, MD

Internist

20311 S.W. Acacia Street Suite #140
Newport Beach, CA 92660

Healthcare specialist
Elie Sader, MD Neurologist
24.6 mi
777 S Alameda St # 2
Los Angeles, CA 90021

Elie Sader, MD

Neurologist

777 S Alameda St # 2
Los Angeles, CA 90021

Joao Ferraz, MD
Joao Ferraz, MD Internist
24.7 mi
3605 Long Beach Boulevard
Suite 405
Long Beach, CA 90807
About Joao Ferraz, MD

Joao Ferraz, MD, is a fellowship-trained Critical Care Medicine specialist at Long Beach Medical Center. He completed his fellowship in Critical Care Medicine at Baylor College of Medicine in Houston, Texas, where he received extensive training in the management of critically ill patients, including advanced mechanical ventilation, hemodynamic support, and cardiovascular critical care.

Prior to fellowship, Dr. Ferraz practiced as a hospitalist at Cleveland Clinic in Cleveland, Ohio. He completed his Internal Medicine residency in Chicago and earned his medical degree from the University of São Paulo in Brazil.

Dr. Ferraz has particular interests in mechanical ventilation, respiratory failure, hemodynamics, cardiovascular critical care, and the care of patients with complex multisystem illnesses. His training also includes extensive experience with advanced mechanical circulatory support, including ECMO, ventricular assist devices, and other temporary mechanical support systems.

In addition to his clinical work, Dr. Ferraz is involved in medical education, clinical research, and quality improvement. He has published several peer-reviewed studies focused on the management of critically ill patients with respiratory failure and continues to pursue research aimed at improving evidence-based care and outcomes in the intensive care unit.

Originally from Brazil, Dr. Ferraz is fluent in English, Portuguese, Spanish, and French. Outside of medicine, he enjoys tennis, skiing, traveling, and spending time with his family.

Practice
SoCal Pulmonologists and Intensivists Network of Sound Physicians
Joao Ferraz, MD

Joao Ferraz, MD

Internist

3605 Long Beach Boulevard
Suite 405
Long Beach, CA 90807

Dr. Maged Tanios, MD
Dr. Maged Tanios, MD Internist
24.7 mi
3605 Long Beach Boulevard
Suite 405
Long Beach, CA 90807
About Dr. Maged Tanios, MD

Dr. Maged Tanios serves as the Regional Medical Director of Sound Physicians and is the current director of the ICU and Intensivists Program at Long Beach Medical Center. Dr. Tanios is a Board-Certified physician who specializes in pulmonary medicine, critical care, and sleep medicine. At Southern California Pulmonologists and Intensivists Network of Sound Physicians, the doctor and his staff serve the residents of Long Beach, California, and many neighboring communities. Dr. Tanios has been practicing medicine in Southern California for almost 15 years. He is a pillar in the local medical community and serves on many hospital boards and committees in the Long Beach area.

After completing his internal medicine residency, Dr. Tanios went on to complete several fellowships including three at Tufts-New England Medical Center in sleep medicine, critical care medicine, and pulmonary medicine. In addition to earning his medical degree, Dr. Tanios earned a Master of Public Health (MPH) in Health Services Management & Policy from Tufts University School of Medicine and is completing an MBA in Healthcare Management at Johns Hopkins Carey Business School.

Dr. Tanios is also an accomplished associate professor of medicine at David Geffen School of Medicine at UCLA. Dr. Tanios received the Golden Apple Award for Teaching excellence from the Family Medicine program at Long Beach Medical Center and the Munzer Family Award for Research and Literary accomplishment from the Memorial Medical Center Foundation.

Dr. Tanios has received numerous achievements and awards for his work. He has been recognized by the American Lung Association and has also applied for and received grants from the National Institutes of Health. Most recently, Dr. Tanios was selected to the 2016 registry of “America’s Best Physicians.” He has also been listed on Southern California Super Doctors for the consecutive years of 2016-2021.

Dr. Tanios is a member of the American Thoracic Society, the American College of Chest Physicians, and the Society of Critical Care Medicine.

Practice
SoCal Pulmonologists and Intensivists Network of Sound Physicians
Dr. Maged Tanios, MD

Dr. Maged Tanios, MD

Internist

3605 Long Beach Boulevard
Suite 405
Long Beach, CA 90807

Healthcare specialist
Christopher Chu, MD Cardiovascular Disease Physician
24.9 mi
711 W. College St
540
Los Angeles, CA 90012

Christopher Chu, MD

Internist

711 W. College St
540
Los Angeles, CA 90012

James Wortham, MD
4.9
(95)
James Wortham, MD Internist
25.7 mi
4.9 (95)
4701 Gould Ave
La Canada Flintridge, CA 91011
+1 more location
About James Wortham, MD
Dr. Keller Wortham is a General Practitioner who has been practicing Family Medicine in the Los Angeles area for fifteen years Dr. Keller Wortham received his Medical Degree from Georgetown University, and completed his internship in Internal Medicine at the University of Pittsburgh. Dr. Wortham believes the first step to a healthy lifestyle is understanding the human body. He therefore always makes sure to devote time educating patients on their individual health and treatment options so they can make informed decisions about their medical care.
Practice
Optimum Medical Group North
Latest Review
“Friendly office staff very helpful”
James Wortham, MD

James Wortham, MD

Internist

4701 Gould Ave
La Canada Flintridge, CA 91011

4.9 (95)
Nare Stepanyan, MD
4.78
(50)
Nare Stepanyan, MD Internist
25.7 mi
4.78 (50)
4701 Gould Ave
La Canada Flintridge, CA 91011
+1 more location
About Nare Stepanyan, MD
Growing up in Germany, Dr. Stepanyan was exposed to a diverse population at the heart of Europe. Throughout her studies, Dr. Stepanyan had the opportunity to closely study the public health systems of various countries, notably the United States. Dr. Stepanyan completed extensive residency training in family medicine at Loma Linda University and Adventist Health, working very closely with an underserved population with very complex health needs. Her experience and depth of knowledge quickly certified her with the American Board of Family Medicine. Outside of her community, Dr. Stepanyan has a strong passion about global health and medical mission work. She is fluent in German, English, Russian, and Armenian.
Practice
Optimum Medical Group North
Latest Review
“As always, the staff and Dr. Stepanyan were efficient, friendly and wonderful!”
Nare Stepanyan, MD

Nare Stepanyan, MD

Internist

4701 Gould Ave
La Canada Flintridge, CA 91011

4.78 (50)
Healthcare specialist
Kate Donkor, FNP Family Nurse Practitioner
25.9 mi
3133 Mission Inn Ave Suite B
Riverside, CA 92507

Kate Donkor, FNP

Nurse Practitioner

3133 Mission Inn Ave Suite B
Riverside, CA 92507

Healthcare specialist
Konstantinos Melahoures, MD Internist
25.9 mi
27660 Santa Margarita Pkwy.
Mission Viejo, CA 92691

Konstantinos Melahoures, MD

Internist

27660 Santa Margarita Pkwy.
Mission Viejo, CA 92691

Dr. John Alevizos, DO
Dr. John Alevizos, DO Adult Medicine Physician
25.9 mi
15751 Rockfield Blvd
Suite 120
Irvine, CA 92618
About Dr. John Alevizos, DO

Welcome to Alevizos Medical

Alevizos Medical in Irvine, California, specializes in anti-aging medicine, helping patients to look and feel energetic, having more lean muscle mass, and happier. 

Founder John Alevizos, DO, is a board-certified family practice physician who has a passion for anti-aging medicine. He follows the principles of integrative medicine to combine the most beneficial aspects of conventional and alternative methods, and provide a holistic approach to patient care.

His primary focus is the use of bioidentical hormone replacement therapy (BHRT) to address hormone imbalances. Less-than-optimal levels of essential hormones like estrogen and testosterone can cause issues such as weight gain, loss of sex drive, lack of energy, moodiness and anxiety, trouble sleeping, and depression. 

Dr. Alevizos and his team also offer effective long-term solutions to weight loss to help patients look and feel their best and enjoy life to the fullest.

He treats a range of sports injuries using innovative products like platelet-rich plasma (PRP) to encourage tissue healing.

Find out more about looking and feeling younger by calling Alevizos Medical or booking an appointment online today.

Practice
Alevizos Medical
Dr. John Alevizos, DO

Dr. John Alevizos, DO

Internist

15751 Rockfield Blvd
Suite 120
Irvine, CA 92618

Healthcare specialist
Faramarz Tehrani Cardiologist
26.0 mi
1401 S. Grand Ave
Los Angeles, CA 90015

Faramarz Tehrani

Cardiologist

1401 S. Grand Ave
Los Angeles, CA 90015

Healthcare specialist
Parham Parto, MD, MPH Cardiovascular Disease Physician
26.0 mi
1513 S. Grand Ave. Ste 400
Los Angeles, CA 90015

Parham Parto, MD, MPH

Internist

1513 S. Grand Ave. Ste 400
Los Angeles, CA 90015

Dr. Alan Rojas, MD
Dr. Alan Rojas, MD Internist
26.1 mi
1245 Wilshire Blvd
Ste 611
Los Angeles, CA 90017
Dr. Alan Rojas, MD

Dr. Alan Rojas, MD

Internist

1245 Wilshire Blvd
Ste 611
Los Angeles, CA 90017

Healthcare specialist
Dr. Carol Richardson-Te, MD Internist
26.1 mi
1245 Wilshire Blvd
Suite 630
Los Angeles, CA 90017

Dr. Carol Richardson-Te, MD

Internist

1245 Wilshire Blvd
Suite 630
Los Angeles, CA 90017

Healthcare specialist
Carlos Martinez, MD Internist
26.1 mi
1245 Wilshire Blvd Suite 630
Los Angeles, CA 90017
+1 more location

Carlos Martinez, MD

Internist

1245 Wilshire Blvd Suite 630
Los Angeles, CA 90017

Healthcare specialist
Wisam Khader, DO Internist
26.1 mi
1050 Linden Ave
Long Beach, CA 90813

Wisam Khader, DO

Internist

1050 Linden Ave
Long Beach, CA 90813