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Erica Chen, MD, is a board-certified allergy and immunology specialist practicing at the Allergy and Asthma Specialist Doctors, Inc. location in West Covina, California. Her practice is centered around the treatment of allergic diseases, including nasal allergies and asthma.

Dr. Chen earned her medical degree from the Keck School of Medicine at the University of Southern California. Subsequently, she completed her combined internal medicine pediatric residency and allergy and immunology fellowship training at the Los Angeles County Hospital at the University of Southern California.

Dr. Chen is board certified by the American Board of Allergy and Immunology. She has contributed to multiple peer-reviewed scientific presentations and publications. She also holds numerous professional society memberships, including the American Academy of Allergy Asthma and Immunology and the American College of Allergy, Asthma and Immunology.

Dr. Chen is currently accepting new patients and looks forward to welcoming them to Allergy and Asthma Specialist Doctors, Inc.

Advanced Gastroenterology & Liver Institute in Anaheim, Santa Ana, Fullerton, and Huntington Beach, California, provides comprehensive gastroenterology care. People travel from all over to consult with Tahmina Haq, MD, who is well-known for her compassionate care and clinical expertise.

At Advanced Gastroenterology & Liver Institute, Dr. Haq specializes in diagnosing and treating digestive disorders like Crohn’s disease, ulcerative colitis, and hepatitis. She also performs a number of diagnostic procedures, including upper endoscopy, endoscopic ultrasound, and endoscopic retrograde cholangiopancreatography (ERCP). 

In addition, people come to Advanced Gastroenterology & Liver Institute for colon cancer screenings and treatment of colon polyps. Dr. Haq maintains an adenoma detection rate (ADR) well above the national benchmark of 25%, as established by leading Gastroenterology societies and published guidelines from the ASGE, ACG, and peer-reviewed medical journals. This reflects her commitment to high-quality, thorough, and preventive patient care.

After earning her Doctor of Medicine at Shifa College of Medicine in Rawalpindi, Islamabad, Pakistan, Dr. Haq completed her internal medicine residency at Loma Linda University Medical Center in Loma Linda, California. 

She then completed her gastroenterology fellowship at the University of California, San Francisco (UCSF) and her advanced endoscopy fellowship at Harbor-UCLA Medical Center in West Carson, California.

Dr. Haq takes the time to get to know her patients, building trust and long-lasting relationships. When not taking care of her patients, Dr. Haq enjoys traveling and spending time with her family.

Call Advanced Gastroenterology & Liver Institute or use the online booking button to schedule an appointment today.

About The Practice

Cardiology Specialists of Orange County, with locations in Santa Ana, Irvine, and Newport Beach, California, provides high-quality cardiovascular services focusing on disease prevention and treatment. The outstanding physicians are board certified in cardiovascular diseases and use cutting-edge technology combined with consistently superior compassionate care to offer optimal patient outcomes.

At Cardiology Specialists of Orange County, patients benefit from triple-accredited laboratory facilities and comprehensive in-house services to make everything as easy as possible. These awards recognize Cardiology Specialists of Orange County's superior commitment to patient care and its provision of quality diagnostic testing.

The advanced diagnostics available include echocardiograms, stress testing, Holter monitoring, event monitoring, and vascular screening. The Santa Ana location also has a nuclear testing and imaging system and offers external counterpulsation (ECP) therapy for patients with chronic stable angina.

Cardiology Specialists of Orange County treat conditions including coronary artery disease, high blood pressure, congestive heart failure, and atrial fibrillation. They can also diagnose and treat symptoms like chest pain, arrhythmia, shortness of breath, and heart murmurs.

Patients can receive expert care for circulatory problems like chronic venous insufficiency and varicose veins. Treatments for these conditions include patient information and education on making healthy lifestyle choices and a wide range of medications. The cardiologists also perform minimally invasive cardiac catheterization procedures such as balloon angioplasty, as well as pacemaker and defibrillator implantation.

For over 30 years, Cardiology Specialists of Orange County has provided invaluable services to the local community, and their cardiologists also have roles at partnering hospitals. The practice has an established patient base with a solid reputation for patient-centered care and receives numerous referrals via word of mouth.

For timely and successful treatment of your cardiovascular problems, call Cardiology Specialists of Orange County or book an appointment online today.

Board-certified cardiologist Ethan Yalvac, MD, FACC, FSCAI, RPVI, CBNC, is proud to provide comprehensive care to patients at Cardiology Specialists of Orange County in Santa Ana, Irvine, and Newport Beach, California.

Dr. Yalvac received his Bachelor of Arts in economics and math, graduating cum laude. He earned his Doctor of Medicine from the University of Texas Medical Branch School of Medicine in Galveston. He then completed his internship and residency in internal medicine at Tulane University in New Orleans, Louisiana. Afterward, Dr. Yalvac completed a general cardiology fellowship at the Tulane University Heart and Vascular Institute before completing an interventional cardiology fellowship at the University of California, San Diego. 

He holds certification from the Board of Nuclear Cardiology in advanced cardiac life support and is Level II trained in echocardiography. Dr. Yalvac is a member of the Society for Vascular Ultrasound, and a fellow of the American College of Cardiology and the Society for Cardiovascular Angiography and Interventions.

Dr. Yalvac is affiliated with Hoag Hospital and Hoag Vascular Institute in Newport Beach, Hoag Hospital & Orthopedic Institute in Irvine, St. Joseph Hospital in Orange, and Orange County Medical Center in Santa Ana, California.

Mahmoud Eslami-Farsani, MD, FACC, FSCAI, is a board-certified cardiologist at Cardiology Specialists of Orange County in Santa Ana, Irvine, and Newport Beach, California. He has special interests in coronary intervention, including angioplasty, stent placement, valvuloplasty, valvular heart disease, and peripheral vascular intervention. 

Dr. Eslami-Farsani earned his medical degree from Hahnemann University in Philadelphia, Pennsylvania. He then completed his internship and residency at the University of California, Irvine Medical Center in Orange, California, before completing his interventional and cardiology fellowships at the University of Southern California in Los Angeles.

He holds board-certifications in cardiovascular disease, interventional cardiology, and internal medicine. To remain up-to-date on the latest developments in his field, Dr. Eslami-Farsani is a member of the American College of Cardiology, the American Medical Association, and the American College of Physicians. 

Dr. Eslami-Farsani is currently welcoming new patients and looks forward to partnering with them. Schedule an appointment with Dr. Eslami-Farsani by calling the office or booking online today.

Ali Ashtiani, MD is a fellowship-trained, board-eligible interventional cardiologist at Cardiology Specialists of Orange County (CSOC) practicing in Santa Ana, Irvine, and Newport Beach, California. He has special interests in coronary intervention including coronary angioplasty & stent placement, pacemaker implantation, and valvular/structural heart disease.

Dr. Ashtiani received his medical training in our very own Orange County. After earning his medical degree from the University of California, Irvine Medical Center in Orange, California, he went on to complete internal medicine internship and residency followed by cardiology fellowship and advanced fellowship training in interventional cardiology at the same institution.


Dr. Ashtiani is affiliated with Hoag Hospital Heart and Vascular Institute in Newport Beach, Hoag Hospital Irvine, & Hoag Orthopedic Institute, St. Joseph Hospital in Orange, and Orange County Global Medical Center in Santa Ana.

Dr. Ashtiani is currently welcoming new patients and looks forward to providing individualized care with patience and compassion just as he would treat his own family. Schedule an appointment with Dr. Ashtiani by contacting our office today.

Bao Khanh Thai, DO, is a board-certified family medicine physician with more than 13 years of experience. She serves patients at United Family Physicians in Glendora, California, providing comprehensive care for patients of all ages, with a special focus on preventive medicine, chronic disease management, and senior care. Known for her compassionate and approachable style, Dr. Thai is dedicated to building long-term partnerships with her patients and their families.

Dr. Thai earned her medical degree from Western University of Health Sciences in Pomona, California, and completed her internship and residency training at Pomona Valley Hospital, a UCLA-affiliated program. She is fluent in Vietnamese, allowing her to serve a diverse patient population and make quality healthcare more accessible to the community.

Through her affiliation with Emanate Health, Regal Medical Group, and Lakeside Community Healthcare, Dr. Thai’s patients benefit from access to leading hospitals, specialists, labs, imaging facilities, and chronic care support programs. She also maintains hospital privileges at Foothill Presbyterian Hospital, ensuring continuity of care when patients need it most.

In addition to her clinical expertise, Dr. Thai emphasizes patient education and preventive care, empowering individuals to make informed decisions about their health.

In her free time, she enjoys gardening, hiking, and traveling, bringing the same curiosity and care to her personal life as she does to her practice. Patients trust Dr. Thai for her dedication to personalized, high-quality care that supports overall well-being at every stage of life.