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Shawn Hamilton, MD, has more than 20 years of experience as a board-certified physician in internal medicine. She practices at Spruce Medical Group in Irvine, California, and is affiliated with Hoag Memorial Hospital Presbyterian, located in Newport and in Irvine, California. Dr. Hamilton speaks many languages, including Chinese (Mandarin), Taiwanese, and some medical Spanish.

Dr. Hamilton graduated from the David Geffen School of Medicine at UCLA and completed her residency in Internal Medicine at the Charles R. Drew University of Science and Medicine in Los Angeles. To reach as many people in her diverse community as possible, she accepts a wide range of insurances, including Cal-Optima, Medicare, Aetna PPO, Blue Cross Prudent Buyer PPO, and United Health PPO.

As a primary care physician, Dr. Hamilton sees her role as addressing the concerns of the men and women who visit her office, assessing their symptoms, and treating them, or if necessary, referring them to a subspecialist. She prides herself on minimizing any delay in calling in medications and processing referrals for lab and radiology orders, which has earned her accolades for running an efficient, caring practice and the Top Doctors award of Orange Coast Magazine.

Heba Ashraf, MD, FACP is a gastroenterologist at Digestive Disease Consultants of Orange County with locations in Irvine, Huntington Beach, Tustin and Foothill Ranch, California. She is dual board certified in Internal Medicine and Gastroenterology by the American Board of Internal Medicine.

She specializes in management of a wide array of gastrointestinal diseases including GERD, liver diseases/cirrhosis and inflammatory bowel disease. In addition to performing diagnostic and therapeutic upper and lower endoscopy, Dr. Ashraf also performs High Resolution Manometry, EndoFlip, pH testing and Capsule endoscopy.

She is a member of American Gastroenterological Association (AGA), the American College of Gastroenterology (ACG), the American Society of Gastrointestinal Endoscopy (ASGE) and American Association for the study of Liver Diseases (AASLD).

Dr. Ashraf grew up in New Jersey spending her days either at the shore or in the nearby cities. She went to Rutgers University then completed her medical school at Baqai Medical University in Pakistan. She completed her internal medicine residency at Beaumont Hospital in Michigan. After residency she became one of the first GI hospitalists at Thomas Jefferson University in Philadelphia. She then completed her GI fellowship at Michigan State/Ascension Providence Hospital.

She developed an interest in gastroenterology and nutrition early in her medical training. She has a fond interest in women’s health and prevention of gastrointestinal cancers. She believes her role as a physician is to provide her patients with accurate information and work as a team to accomplish their goals and improve overall health and well-being.

Dr. Ashraf has earned numerous awards throughout her medical career including Wayne State University Resident teaching award, Beaumont Resident Research Day Winner, and ACG Outstanding Poster Presenter.

Outside of work, she spends her time traveling and spending time with her 4 siblings. She also loves hiking and cooking. Dr. Ashraf is fluent in English, Urdu and Hindi.

Paul Lee, MD, MPH, MA, is a compassionate gastroenterologist at Digestive Disease Consultants of Orange County, with locations in Irvine, Huntington Beach, Tustin, and Foothill Ranch, California. 

Many people ask Dr. Lee why he chose to be a gastroenterologist, and for him the answer is simple: Instead of choosing this field, he thinks, more accurately, it chose him. He grew up with a close family member with Crohn’s disease. At that time, there were fewer options to treat this chronic disease, and he saw how it affected not only her body but also her mind and spirit. This sparked his passion. Gastroenterology is a great field to not only treat diseases but also to prevent them, which he finds incredible.

To achieve his goal of becoming a gastroenterologist, Dr. Lee earned his Doctor of Medicine from the George Washington University Medical School, and then went on to earn his Master of Public Health from the University of California School of Public Health. He completed his residency at the University of Southern California, followed by a fellowship in gastroenterology/hematology. He is board-certified in gastroenterology/hepatology and internal medicine.

As part of his work, Dr. Lee knows that diseases can present in different ways because every human is unique. He seeks to understand that uniqueness and uses it as a tool to better his patients’ health. This bio-psycho-social aspect of medicine is crucial in diagnosing, maintaining, and maximizing one’s GI health.

Throughout this career, Dr. Lee has earned several awards, including the Physicians of Excellence Award, and the Orange County Register and Orange County Medical Association Award in 2015, 2016, and 2017. He is a member of the American College of Gastroenterology, the American Society of Gastrointestinal Endoscopy, and the American College of Physicians.

For Dr. Lee, his one constant in medicine is that he loves what he does. And if patients can appreciate that, it is the right start in establishing that special connection: the doctor-patient relationship.

Dr. Lee founded Digestive Disease Consultants of Orange County in 2008. He strives to be a compassionate physician and a loving father of three children, and a husband to his lovely wife. 

His background in health food and nutrition broadens his perspective on medicine and treatment options. In addition to medicine, he regularly attends Redeemer Presbyterian Church, holds a black belt in tae kwon do, and enjoys travel, fine dining, and the arts.

Matthew Oman, MD, is a skilled gastroenterologist at Digestive Disease Consultants of Orange County, with locations in Irvine, Huntington Beach, Tustin, and Foothill Ranch, California.

Dr. Oman attended medical school at the University of Utah. He completed his residency at the University of Colorado and completed his fellowship in  Endoscopic Retrograde Cholangiopancreatography (ERCP) and Endoscopic Ultrasound (EUS) at Loma Linda University. He is board-certified in gastroenterology/hepatology and internal medicine.

When Dr. Oman entered medical school, many of his classmates knew the specialty they wanted to work in. However, he had an open mind and was excited to be exposed to the various specialties of medicine. When the time came to decide, he had noticed that he was most interested and happy when encountering patients with gastroenterology and hepatology health issues. While he is fascinated with the pathophysiology and medical side of this specialty, it was the technical, hands-on, endoscopic aspect that solidified his decision. 

He was amazed as a medical student the first time he saw a bleeding gastric ulcer treated endoscopically. While training in fellowship, he could see how endoscopy is much more and can relieve a variety of issues and symptoms for patients, from removing a gallstone lodged in the bile duct, opening a stricture in the esophagus so a patient can swallow again or draining a cyst through endoscopic ultrasound.

Dr. Oman has interests in colorectal cancer prevention and diagnosis, stomach and esophageal disorders, small bowel disorders, as well as pancreas and biliary disorders, which include advanced pancreatic and biliary diagnosis and intervention (ERCP, EUS). 

Throughout his career, he has earned numerous awards, including the Resident Consultant of the Year (Loma Linda Family Medicine) and the Internal Medicine Subspecialty Fellow of the Year (Loma Linda Internal Medicine). He is also a member of several organizations, including Alpha Omega Alpha, the American Society of Gastrointestinal Endoscopy, the American College of Gastroenterology, the American Gastroenterology Association, and the Southern California Society of Gastroenterology.

He spends his time away from work with his wife and young son but still tries to go hiking, mountain biking, and indoor rock climbing.

Bertrand de Silva, M.D., F.C.C.P. is a graduate of the St. Thomas Hospital Medical School, University of London, England 1986. He completed his Internship at Kern Medical Center, Bakersfield and Internal Medicine training at USC County Hospital, Los Angeles and a Pulmonary, Critical

Care and Sleep Fellowship at Cedars Sinai Hospital. He is board certified in all these fields.

He currently resides in Yorba Linda, California with his lovely wife and two daughters. In his spare time, he enjoys traveling abroad and spending time with his family.

Heba Ashraf, MD, FACP is a gastroenterologist at Digestive Disease Consultants of Orange County with locations in Irvine, Huntington Beach, Tustin and Foothill Ranch, California. She is dual board certified in Internal Medicine and Gastroenterology by the American Board of Internal Medicine.

She specializes in management of a wide array of gastrointestinal diseases including GERD, liver diseases/cirrhosis and inflammatory bowel disease. In addition to performing diagnostic and therapeutic upper and lower endoscopy, Dr. Ashraf also performs High Resolution Manometry, EndoFlip, pH testing and Capsule endoscopy.

She is a member of American Gastroenterological Association (AGA), the American College of Gastroenterology (ACG), the American Society of Gastrointestinal Endoscopy (ASGE) and American Association for the study of Liver Diseases (AASLD).

Dr. Ashraf grew up in New Jersey spending her days either at the shore or in the nearby cities. She went to Rutgers University then completed her medical school at Baqai Medical University in Pakistan. She completed her internal medicine residency at Beaumont Hospital in Michigan. After residency she became one of the first GI hospitalists at Thomas Jefferson University in Philadelphia. She then completed her GI fellowship at Michigan State/Ascension Providence Hospital.

She developed an interest in gastroenterology and nutrition early in her medical training. She has a fond interest in women’s health and prevention of gastrointestinal cancers. She believes her role as a physician is to provide her patients with accurate information and work as a team to accomplish their goals and improve overall health and well-being.

Dr. Ashraf has earned numerous awards throughout her medical career including Wayne State University Resident teaching award, Beaumont Resident Research Day Winner, and ACG Outstanding Poster Presenter.

Outside of work, she spends her time traveling and spending time with her 4 siblings. She also loves hiking and cooking. Dr. Ashraf is fluent in English, Urdu and Hindi.

Paul Lee, MD, MPH, MA, is a compassionate gastroenterologist at Digestive Disease Consultants of Orange County, with locations in Irvine, Huntington Beach, Tustin, and Foothill Ranch, California. 

Many people ask Dr. Lee why he chose to be a gastroenterologist, and for him the answer is simple: Instead of choosing this field, he thinks, more accurately, it chose him. He grew up with a close family member with Crohn’s disease. At that time, there were fewer options to treat this chronic disease, and he saw how it affected not only her body but also her mind and spirit. This sparked his passion. Gastroenterology is a great field to not only treat diseases but also to prevent them, which he finds incredible.

To achieve his goal of becoming a gastroenterologist, Dr. Lee earned his Doctor of Medicine from the George Washington University Medical School, and then went on to earn his Master of Public Health from the University of California School of Public Health. He completed his residency at the University of Southern California, followed by a fellowship in gastroenterology/hematology. He is board-certified in gastroenterology/hepatology and internal medicine.

As part of his work, Dr. Lee knows that diseases can present in different ways because every human is unique. He seeks to understand that uniqueness and uses it as a tool to better his patients’ health. This bio-psycho-social aspect of medicine is crucial in diagnosing, maintaining, and maximizing one’s GI health.

Throughout this career, Dr. Lee has earned several awards, including the Physicians of Excellence Award, and the Orange County Register and Orange County Medical Association Award in 2015, 2016, and 2017. He is a member of the American College of Gastroenterology, the American Society of Gastrointestinal Endoscopy, and the American College of Physicians.

For Dr. Lee, his one constant in medicine is that he loves what he does. And if patients can appreciate that, it is the right start in establishing that special connection: the doctor-patient relationship.

Dr. Lee founded Digestive Disease Consultants of Orange County in 2008. He strives to be a compassionate physician and a loving father of three children, and a husband to his lovely wife. 

His background in health food and nutrition broadens his perspective on medicine and treatment options. In addition to medicine, he regularly attends Redeemer Presbyterian Church, holds a black belt in tae kwon do, and enjoys travel, fine dining, and the arts.

Matthew Oman, MD, is a skilled gastroenterologist at Digestive Disease Consultants of Orange County, with locations in Irvine, Huntington Beach, Tustin, and Foothill Ranch, California.

Dr. Oman attended medical school at the University of Utah. He completed his residency at the University of Colorado and completed his fellowship in  Endoscopic Retrograde Cholangiopancreatography (ERCP) and Endoscopic Ultrasound (EUS) at Loma Linda University. He is board-certified in gastroenterology/hepatology and internal medicine.

When Dr. Oman entered medical school, many of his classmates knew the specialty they wanted to work in. However, he had an open mind and was excited to be exposed to the various specialties of medicine. When the time came to decide, he had noticed that he was most interested and happy when encountering patients with gastroenterology and hepatology health issues. While he is fascinated with the pathophysiology and medical side of this specialty, it was the technical, hands-on, endoscopic aspect that solidified his decision. 

He was amazed as a medical student the first time he saw a bleeding gastric ulcer treated endoscopically. While training in fellowship, he could see how endoscopy is much more and can relieve a variety of issues and symptoms for patients, from removing a gallstone lodged in the bile duct, opening a stricture in the esophagus so a patient can swallow again or draining a cyst through endoscopic ultrasound.

Dr. Oman has interests in colorectal cancer prevention and diagnosis, stomach and esophageal disorders, small bowel disorders, as well as pancreas and biliary disorders, which include advanced pancreatic and biliary diagnosis and intervention (ERCP, EUS). 

Throughout his career, he has earned numerous awards, including the Resident Consultant of the Year (Loma Linda Family Medicine) and the Internal Medicine Subspecialty Fellow of the Year (Loma Linda Internal Medicine). He is also a member of several organizations, including Alpha Omega Alpha, the American Society of Gastrointestinal Endoscopy, the American College of Gastroenterology, the American Gastroenterology Association, and the Southern California Society of Gastroenterology.

He spends his time away from work with his wife and young son but still tries to go hiking, mountain biking, and indoor rock climbing.

Board-certified family practice physician and surgeon John Alevizos, DO, is the president and founder of Edinger Urgent Care in Santa Ana, California.

Dr. Alevizos earned his Bachelor of Science in biology from Loyola University in Chicago, Illinois. He then received his master’s degree from the University of Illinois, also in Chicago, before attending Midwestern University Chicago College of Osteopathic Medicine for his medical degree. Afterward, he completed his family practice residency and internship at LAC+USC Medical Center in Los Angeles, California.

He is currently an assistant clinical professor at Western University of Health Sciences, College of Osteopathic Medicine of the Pacific in Pomona, California. Dr. Alevizos is a California Qualified Medical Examiner, United States civil surgeon, and certified medical review officer.

Dr. Alevizos is board certified by the American Association of Colleges of Osteopathic Medicine and the American Board of Anti-Aging/Regenerative Medicine. To better serve more patients, he is fluent in English, Spanish, and Greek.

Men and women in and around Laguna Hills, California, get the best in medical aesthetics and internal medicine care from Mozhgan Ashtari, MD, of Enliven Medical Clinic. Dr. Ashtari is a board-certified internal medicine physician who believes that a holistic approach to health offers the greatest results. 

Dr. Ashtari focuses on physical, mental, and nutritional treatments that prevent chronic disease and enhance patients’ overall quality of life. She believes that even simple aesthetic treatments can delay wrinkles and lines from forming and offers a variety of options to improve well-being on both the inside and outside.

Dr. Ashtari completed her residency in the state of New York at Jamaica Hospital Medical Clinic. She furthered her training by undergoing a fellowship in geriatrics with Flushing Medical Clinic in Queens, New York.

After relocating to California in 2010, Dr. Ashtari worked with Hoag Medical Group before opening her own practice. She is proud to offer a wide range of quality medical and aesthetic services to clients in the Laguna Hills area.

At Enliven Medical Clinic, Dr. Ashtari provides a holistic approach to treatment that makes sure all aspects of a person’s health are addressed. She has a friendly demeanor and builds great rapport with every individual who steps through the clinic doors.

Dr. Ashtari and her daughter enjoy everything that southern California has to offer, including hiking, attending concerts, and spending time at the beach.