Edward Etzkorn, MD, is board certified in internal medicine. Dr Etzkorn earned his medical degree from Georgetown University School of Medicine in Washington, DC. He completed his internship at St. Clare's Hospital in Schenectady, New York and did his residency at District of Columbia General Hospital in Washington, DC. In addition to spending time with his family, Dr. Etzkorn enjoys... Read More about Edward R Etzkorn, MD

Editha Tanig-Sanjongco, NP-C, is a certified nurse practitioner with more than 20 years of nursing experience. Editha earned her Master of Science in Nursing degree from the University of Phoenix in Costa Mesa. Editha loves the nursing profession and helping her patients achieve their best possible health. In her spare time, she enjoys traveling and spending time with her family... Read More about Editha Tanig-Sanjongco

Xinhe Wei is a hematology and oncology nurse practitioner based in Orange, California. She believes in individualized, patient-centered care built on trust and clear communication. By tailoring care to each patient's unique needs, she ensures every individual receives thoughtful, personalized attention.

Thuyvan Lam Nguyen, DO, is board certified in internal medicine. Dr. Nguyen earned her medical degree from Western University of Health Sciences in Pomona. She completed her internship and residency at Loma Linda University Medical Center in California. Dr. Nguyen chose a career in medicine because she believes it is one of the most challenging yet rewarding professions. Patients say... Read More about Thuyvan Lam Nguyen, MD

Khanh Nguyen, MD, is board certified in internal medicine. He is a hospitalist and has more than 10 years of experience. Dr. Nguyen earned his medical degree from Uniformed Services University of the Health Sciences F. Edward Hebert School of Medicine in Maryland. He completed his internship and residency at Naval Medical Center in San Diego. Dr. Nguyen's military experience... Read More about Khanh Van Nguyen

Hsuan-Wen Cathy Huang, MD, is board certified in pulmonology, critical care, and internal medicine. Dr. Huang earned her medical degree from UCLA School of Medicine where she also completed an internship, residency, and a fellowship. Dr. Huang emphasizes patient education in her practice. In addition to English, Dr. Huang speaks Mandarin and Taiwanese.

Ronnie Alas, MD, practices internal medicine and is a hospitalist. Dr. Alas earned his medical degree from Universidad Autonoma de Guadalajara School of Medicine in Mexico. He completed his internship and residency at St. Mary Medical Center in Long Beach. Dr. Alas became a hospitalist because he is strongly motivated to help critically ill patients. His patients say that he... Read More about Ronnie Alexander Alas, MD

Richard Im, MD, is a board-certified internal medicine doctor who graduated from Case Western Reserve University School of Medicine in Cleveland, Ohio. Dr. Im completed his internship and residency at Loma Linda University Medical Center in California. Dr. Im is friendly and empathetic, and his goal is to provide great medical care for the community.

Dr. Mummaneni is a hematology and oncology physician in Orange, California with over 35 years of experience. Is dedicated to providing compassionate, cutting-edge cancer care tailored to each patient's needs. By tailoring care to each patient's unique needs, she ensures every individual receives thoughtful, personalized attention. She also sees patients in Telugu and Hindi.

Dr. Byun is a hematology and oncology physician in Orange, California with over 25 years of experience. Is dedicated to providing compassionate, cutting-edge cancer care tailored to each patient's needs. He approaches every visit as a partnership, making sure patients have the information they need to take an active role in their health. He also sees patients in Korean.

Justin Harris, MD is an internal medicine doctor. Dr. Harris earned his medical degree from West Virginia University School of Medicine. He completed his internship at Harbor-UCLA Medical Center and his residency at Mayo Clinic. Patients describe Dr. Harris as friendly, sincere, and compassionate. He enjoys involving patients in their healthcare decision-making and is dedicated to providing high-quality patient care.... Read More about Justin David Harris, MD

Philip Cheu, MD, is board certified in internal medicine. Dr. Cheu earned his medical degree from the Medical College of Virginia in Richmond. He completed his residency at the Medical College of Pennsylvania Hospital in Philadelphia. In his spare time, Dr. Cheu enjoys playing tennis, chess, traveling and listening to music. In addition to English, Dr. Cheu speaks fluent Mandarin.

Dr. Mahmoud Moammar is a pulmonologist with St. Joseph Heritage Medical Group practicing in Orange, CA. His goal is to provide high-quality, evidence based care to help support his patients through their health care journey. In addition, Dr. Moammar works to educate his patients, emphasize preventative care, and develop a long-term plan that is tailored to each patient's needs.