Find a Top Internist Near Me in Santa Ana, CA – Book an Appointment Instantly

Eric Castleman, MD, is a board-certified cardiologist and internist at COR Healthcare Medical Associates in Los Angeles. He currently sees patients at the practice’s locations in Torrance and Redondo Beach, California, where he brings more than 35 years of experience specializing in general cardiology, and adult congenital heart disease.

Dr. Castleman earned his medical degree at Mount Sinai School of Medicine in New York City before moving to California for his medical training. He completed his internal medicine residency at the University of California, Los Angeles (UCLA) Medical Center and a cardiology fellowship from UC Irvine Medical Center in Orange, California.

Dr. Castleman has many interests outside of work. He loves spending time with his wife, who is a nurse, and their four children. He loves gardening, traveling, and tinkering in the garage repairing things.

A triple diplomate of the American Board of Internal Medicine, Matthew Ostrom, MD, is board-certified in clinical cardiac electrophysiology, cardiovascular disease, nuclear cardiology, and internal medicine. Dr. Ostrom, who has more than 15 years of experience, serves the Los Angeles communities of Torrance and Redondo Beach, California, at COR Healthcare Medical Associates.

Born and raised in Seattle, Dr. Ostrom received his Bachelor of Science in microbiology from the University of Washington in 1999. Throughout his undergraduate studies, Dr. Ostrom was actively involved in cardiovascular research at the university and at the local biotechnology company ZymoGenetics, Inc.

Shortly after graduating, Dr. Ostrom began his medical studies at Loyola University Chicago Stritch School of Medicine. He completed an internal medicine internship and residency through the University of California, Los Angeles (UCLA) system. In addition, Dr. Ostrom pursued cardiology and electrophysiology fellowships at Harbor-UCLA Medical Center in West Carson, California, and at Kaiser Permanente Los Angeles Medical Center in Los Angeles. He is a fellow of the American College of Cardiology and the Heart Rhythm Society. 

Today, Dr. Ostrom is a practicing electrophysiologist, specializing in catheter and device-based therapies in the treatment of complex arrhythmias, syncope, sudden cardiac death, and heart failure.

His research interests include the ablation of complex arrhythmias and device-based treatments for sudden cardiac death and congestive heart failure. Dr. Ostrom has authored or co-authored numerous articles in peer-reviewed cardiology and electrophysiology journals.

In addition to his work at COR Healthcare Medical Associates, Dr. Ostrom is on staff at Providence Little Company of Mary Medical Center and Torrance Memorial Medical Center.

Away from work, Dr. Ostrom loves spending time outdoors with his wife and children.

Arash Aghel, MD, is a board-certified internist and cardiologist at COR Healthcare Medical Associates in Los Angeles. He sees patients at the Torrance, California office where he specializes in general cardiology, interventional cardiology, structural heart, and peripheral vascular interventions.

Dr. Aghel earned his medical degree from Mashhad University of Medical Sciences in Iran before moving to Cleveland for his internal medicine residency and cardiology fellowship at Cleveland Clinic and Case Western Reserve University.  He then moved to Colorado and completed 2 additional years of training in interventional cardiology and advanced structural and vascular interventions at the University of Colorado in Denver.

Dr. Aghel joins COR Healthcare Medical Associates from Colorado where he was busy practicing interventional cardiology for the past 7 years. He treats the entire scope of cardiac disease including complex coronary interventions, transcatheter aortic valve replacement, and peripheral vascular intervention with a focus on limb salvage/preservation.

He is board certified in cardiovascular medicine, interventional cardiology, echocardiography, vascular interpretation, and endovascular medicine.

Dr. Aghel is fluent in English and Farsi.

Outside of work, Dr. Aghel enjoys spending time outdoors with his wife and two daughters.

Michael Healy, MD, is a board-certified cardiologist who specializes in interventional and structural cardiology. His areas of expertise include state-of-the-art, minimally-invasive procedures for the treatment of coronary and valvular heart disease.

Dr. Healy earned his medical degree with honors from Columbia University, College of Physicians and Surgeons. He completed internal medicine residency at the University of California, San Francisco (UCSF) and cardiology fellowship at Mount Sinai Hospital in New York City. Dr. Healy then completed interventional cardiology fellowship at Scripps Clinic in San Diego, followed by advanced training in structural heart, peripheral vascular, and complex coronary interventions. He is board-certified in internal medicine, cardiology, interventional cardiology, echocardiography, vascular interpretation, and cardiac CT.

Prior to being recruited to COR Healthcare, Dr. Healy worked as an interventional cardiologist at Scripps Clinic where he was part of the teaching faculty of the fellowship training program. Dr. Healy prides himself on providing evidence-based, cutting-edge care to his patients and has been a co-investigator in several clinical trials for novel interventional device technologies.

Dr. Healy enjoys getting to know his patients and focuses on all aspects of their lives in order to personalize their treatment plans. During visits, he prioritizes educating patients with the goal of empowering them to make the best decisions regarding their unique heart condition, while also coaching them back to maximal health.

During his free time, Dr. Healy enjoys spending quality time with his family and traveling abroad. He is also an avid long-distance runner.

Paul Moya, DO, is a board-certified family medicine physician who has been proudly serving Glendora, California, and the surrounding communities for more than 13 years. As part of United Family Physicians, Dr. Moya provides comprehensive care across all stages of life, with special expertise in preventive medicine, geriatric care, and the management of both acute and chronic medical conditions.

After earning his medical degree from Western University of Health Sciences in Pomona, California, Dr. Moya completed his internship and residency at Pomona Valley Hospital, a UCLA-affiliated program. Today, he partners with Emanate Health, Regal Medical Group and Lakeside Community Healthcare, giving his patients access to a vast network of specialists, leading hospitals, labs, and support services designed to make quality care accessible and seamless.

Dr. Moya believes in building lasting relationships with patients and their families through personalized education, preventive care, and individualized treatment plans. His approach is compassionate, approachable, and rooted in a dedication to long-term wellness. He is fluent in Spanish and is affiliated with Foothill Presbyterian Hospital, extending his reach in providing trusted medical care.

Outside of medicine, Dr. Moya enjoys gardening, hiking, and cooking. Patients appreciate his commitment to listening, understanding, and guiding them through every stage of their health journey. By combining clinical excellence with a caring bedside manner, Dr. Moya continues to make a meaningful difference in the lives of those he serves.

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.

Ulin Sargeant, MD, MPH, is a leading internist and founder of Monrovia Internal Medicine & Primary Care in Duarte, California. Dr. Sargeant is a leading pioneer in the rapidly growing field of telemedicine, a firm believer in optimum patient experience, and an innovator in making medical pricing more transparent and affordable.

Dr. Sargeant received her undergraduate degree from the University of Southern California, as well as a master’s degree in public health from Boston University, where she focused on access to health care and public health law. These studies and her passion for healing others led Dr. Sargeant to Temple University School of Medicine, where she received her medical degree and the Dean’s Award. She then completed a residency in internal medicine at Yale University, where she was awarded the Gary Vernon Humanitarian Award. She is a member of both the American Medical Association and the American Telemedicine Association.

Dr. Sargeant is a pioneer in the field of telemedicine as part of her effort to create a patients-first practice with low wait times and stellar patient satisfaction. Whether you need a visit with urgent care or a virtual appointment made right from your home, you can connect with Dr. Sargeant and her staff promptly for a thorough, attentive evaluation. Dr. Sargeant is also a big believer in “menu-izing” health care, a process that lowers costs to the patients through compartmentalized, transparent pricing structures. Dr. Sargeant speaks Spanish and accepts many forms of insurance and a wide range of HMOs.