Elmer Y. Chang, MD
Mission Viejo, CA 92691
- Mission Heritage Medical Group and Affiliated Physicians
- St. Joseph Heritage Medical Group and Affiliated Physicians
- St. Jude Heritage Medical Group and Affiliated Physicians
Mission Viejo, CA 92691
Providence Center for Digestive Health - Mission Viejo
27799 Medical Center Road, Suite 320, Mission Viejo, CA 92691
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About Elmer Y. Chang
Dr. Chang is a Board Certified Gastroenterologist who specializes in the evaluation and management of disorders of the gastrointestinal tract, pancreas, bile duct, and liver.
He performs upper endoscopy and colonoscopy to screen for, diagnose, and treat a variety of gastrointestinal diseases and cancers.
He also has expertise in several advanced endoscopic techniques including endoscopic retrograde cholangiopancreatography (ERCP), a procedure that is used to manage stones, strictures, and malignant obstruction of the bile duct. He is fluent in English, Mandarin, and Taiwanese.
Dr. Chang graduated with degrees in molecular biology and economics from the Northwestern University, and received his medical degree from the Northwestern University Medical School. After finishing residency training in Internal Medicine from the Baylor College of Medicine, he completed a fellowship in gastroenterology and hepatology at the UCLA School of Medicine.
During his fellowship, Dr. Chang was recruited into the Specialty Training and Advanced Research program at UCLA, where he conducted research in gut immunity and inflammatory bowel disease. In recognition of this research, he was granted a philosophical doctorate degree from the Department of Microbiology, Immunology, and Molecular Genetics at UCLA.
He also received several awards for this work, including grants from the National Institute of Health and the Crohn's and Colitis Foundation of America.
Following his fellowship training at UCLA, Dr. Chang pursued another year of advanced endoscopic fellowship at the UCSF School of Medicine, where he developed expertise in therapeutic ERCP, endoscopic ultrasound, gastrointestinal stricture remediation, and other advanced endoscopic procedures.
Dr. Chang has published numerous abstracts and articles in the field of gut immunity, inflammatory bowel disease, and pancreaticobiliary disorders in peer-reviewed journals such as Gastroenterology, Journal of Clinical Investigation, and Journal of Immunology.
He is a member of the American Gastroenterology Association, American Society of Gastrointestinal Endoscopy, American College of Gastroenterology, and American Medical Association.
Northwestern University School of Medicine
InternshipBaylor College of Medicine
ResidencyBaylor College of Medicine
Fellowship
UCSF Medical Center at Parnassus
2008
UCLA Medical Center
2007
- American Board of Internal Medicine, Gastroenterology
27799 Medical Center Road, Suite 320
Mission Viejo, CA 92691
Providence Mission Hospital - Laguna Beach
Providence Mission Hospital - Mission Viejo
Community Reviews
At Providence, we're dedicated to providing you quality, personalized health care. We are constantly striving to optimize your experience.
As part of ensuring you have a positive experience with Providence, our online provider directory includes ratings and patient comments for select providers. More about our survey.
One f the best & easy to talk to doctor...
Providence Patient
I have been Dr. Chang's patient for more than 10 years and have referred my family and friends.
Providence Patient
Dr. Elmer Chang is very thorough and explained the need for future follow up care with a Surgeon. He has a wonder manor and explained everything too me. I would recommend him to my family!!
Providence Patient
Provider is a good listener & seems to have empathy for his patients.
Providence Patient
Dr Chang is very attentive and compassionate.
Providence Patient
He took his time to listen to all my concerns and didn't rush me out
Providence Patient
Dr. Chang and his staff are absolutely amazing. The entire experience was impressive by how efficient and attentive everybody was and how kind and careful they were in treating me.
Providence Patient
I have been seeing Dr Chang for almost 11 years and I can't imagine seeing a different Gastroenterologist. I feel very at ease with him. I have recommended other family members and friends to him also. He's wonderful and takes my health challenges seriously.
Providence Patient
Dr Chang is the best
Providence Patient
Dr. Chang and his staff make themselves available immediately to address my concerns. He is thorough and caring. I could not ask for better medical care. I am blessed to have him as my physician. Thank you.
Providence Patient
Good experience
Providence Patient
He always seems to be in a rush.
Providence Patient
Very good experience
Providence Patient
Good experience
Providence Patient
In general, good experience
Providence Patient
Very professional and timely and in a good disposition and listen to all of my questions answered on a very knowledgeable base.
Providence Patient
Excellent physician and staff. They really listen and take care of any concerns.
Providence Patient
If I could say my experience was better than excellent, I would. Doctor spent the full allotted time with me and understood my issues.
Providence Patient
So appreciate Dr Elmer Chang's care and explanations. He is the best!!! Ever grateful!
Providence Patient
He did not discuss when I should take my insulin the night before or how much to take I am a Type 1 Insulin Dependent Diabetic and need to know how much insulin to take the night before and in the morning because I take2 insulins 1 short acting and 1 long acting. This is very important and I will have to call my endocrinologist for advise.
Providence Patient
Dr Chang is very responsive to finding a way to help you even when his schedule is booked. I really appreciate that he missed lunch and other personal activities to answer my questions and get me set to good health.
Providence Patient
Dr. Chang listens to my concerns.
Providence Patient
All good all the way! 5 stars.
Providence Patient
Dr Elmer Chang has been my Gastroenterologist for over 15 years. Alway a great visit.
Providence Patient
My care providers are all very excellent & I am very pleased & satisfied with their care & expertise.
Providence Patient
This process was excellent service and care from my primary doctor to the specialist.
Providence Patient
The office of dr Elmer are exceptional
Providence Patient
All good.
Providence Patient
Very good doctor. Cares about my health and gives good advice.
Providence Patient
Dr. Chang is an excellent doctor and a genuinely concerned Dr regarding his patients welfare.
Providence Patient
Dr. Chang and his staff have always been professional and kind. I know I amIn good hands with this team.
Providence Patient
Dr. Chang is the best of the best!
Providence Patient
This visit was prompt and informative. Dr. Chang was on time and addressed my concerns.
Providence Patient
Always Very patient and concerned. Explained things very well and made sure I was understanding everything. He is the best!
Providence Patient
Dr. Elmer Chang is one of the TOP professionals I have ever encountered. Great doctor, very humane and empathetic. I feel I am in excellent hands under his care. CONGRATULATIONS to Dr. Chang for being such an amazing physician!
Providence Patient
I had a very good experience. All my needs were taken care of.
Providence Patient
This provider listens to the patient and is very considerate.
Providence Patient
De Chang care about you as his patients!
Providence Patient
Exceptional care from all my care providers. I am looking for a home to purchase and the main consideration as far as location is concerned, is that I must be located close to my doctors in the Providence facility in Mission Viejo.
Providence Patient
Very good experience. No complaints.
Providence Patient
The visit was good.
Providence Patient
Efficient and care.
Providence Patient
Dr. Chang asked a lot of questions to get to his treatment plan. I appreciated the full 30 minutes he provided me during the telehealth visit. It was more than what I expected and I am already feeling better. He explained each step clearly and I felt an active participant in the plan.
Providence Patient
Dr Chang is thorough and a great doctor. So appreciate him and his staff making time for an appointment for me.
Providence Patient
I'm very happy to have the care of this provider and his MA and the receptionists at this medical institution: Dr. Is so nice, friendly, knowledgeable his assistants are also very nice and helpful. Thank you
Providence Patient
Very nice and helpful
Providence Patient
Office was extremely prompt in returning my call and getting me in for appointment. Dr. Chang listened to my health concerns and ordered tests to try to diagnose the condition
Providence Patient
We focused on the important things on my health.
Providence Patient
He has an excellent reputation in the community, which is well deserved.
Providence Patient
Dr. Chang is very caring& though!
Providence Patient
Dr Chang is very thorough and understood my complications in my procedure follow up.
Providence Patient
Went over health records carefully and was attentive.
Providence Patient
Always explaining to understand easily.
Providence Patient
The only problem is that this provider is so very popular, so it is difficult to get an appointment. My last appointment was a follow up, so was scheduled 3 months in advance. Dr. Chang is helpful, knowledgeable, and caring.
Providence Patient
Dr Chang is compassionate and considerate. Listened to my concerns, reviewed my previous diagnostics and genuinely showed concern. I will and have recommended him to others.
Providence Patient
Dr Chang is a caring excellent doctor.
Providence Patient
Best care provider. Glad to be his patient.
Providence Patient
Dr Elmer Chemg and his staff are awesome Very efficient and caringThank you so much for taking care of mePls let them know
Providence Patient
Dr Chang is always very thorough in understanding and explaining my health concerns
Providence Patient
The medical assistant was very kind and patient.Dr. Chang is the absolute best: he listens, he cares and he is very, very sharp. I can't say enough good things about him!
Providence Patient
Thank you Dr. Chang for taking such good care of me.
Providence Patient
Dr Chang is the best. I am very comfortable talking with him about my issues. He is extremely thorough and cares.
Providence Patient
Very good experience with my Dr. Would not hesitate to recommend him especially if a diagnosis is needed.
Providence Patient
Dr. Elmer Chang is the best. He is a doctor whose priority is good medicine and treating and caring for the patient, NOT a way to make a buck like some doctors.
Providence Patient
Dr Chang is a good person on top of also being a good physician.
Providence Patient
Glad he had my records.
Providence Patient
Dr. Chang is the best of the best. He is so well trained, professional, studies his patients and listens to what they say.
Providence Patient
I love all my providers. They are very upto date on all my medical needs.
Providence Patient
I liked him very .Much.
Providence Patient
Dr. Chang is my gastrologist, and he Is excellent! I see him every 3 years for a check up and then an appointment for a colonoscopy.He Is very professional and thorough. Explains everything In a way that Is easy to understand, always kind and thoughtful!
Providence Patient
The appointment was very good. Doc is awesome and really does his best and it shows. Only complaint is the unnecessary procedures.
Providence Patient
Dr. Chang is an excellent physician and an asset to your team!!
Providence Patient
Doctor has scheduled testing on October [Date]
Providence Patient
Dr. Chang is very kind, patient and listens to concerns. He explains issues very well and helps to elevate anxiety. I sincerely appreciate his caring attitude!
Providence Patient
Dr Chang is the best.
Providence Patient
Excellent care. Timely response.
Providence Patient
It's always very good.
Providence Patient
Nurse's need to be more flexible with patients Cate provider is very busy but always takes time for you!
Providence Patient
Dr. Chang is very thorough.
Providence Patient
I really trust Dr. Chang.
Providence Patient
Dr Chang is the best. He's brilliant and thorough and very likable.
Providence Patient
Everything was excellent
Providence Patient
Everyone was so caring. The Dr took the time to explain everything and answered all of my questions.
Providence Patient
Dr Chang is terrific
Providence Patient
He is thorough, shows empathy and understanding of my GI problems and offers likely approaches for addressing my problems.
Providence Patient
Dr. Blanca Bisuna, MD and Dr. Elmer Chang, MD are fantastic providers. I have a personal condition that goes beyond the scopes of expertise of these doctors, but they took the time to understand the source of the problem of my health issues. We need more physicians like them. My heartfelt gratitude to these doctors and their staffs. Thank you. [Name(s)]
Providence Patient
Excellent doctor. Able to access problem and and give treatment plan
Providence Patient
Great
Providence Patient
Dr. Chang informed me of blood tests I should be doing every year due to my Celiac to check my numbers in order not to get any other conditions
Providence Patient
Dr. Chang is great!
Providence Patient
He is always friendly - remembers my name unlike some of my doctors. He doesn't rush me.
Providence Patient
My questions were answered fully.!
Providence Patient
I feel very good and trust there medical advice.
Providence Patient
Dr. Chang is the best in his field and I am totally confident with his practice.
Providence Patient
Very good doctors
Providence Patient
Dr Chang is very knowledgeable, a great problem solver and always warm and welcoming
Providence Patient
Dr, Chang explained everything carefully and was easy to understand.Healso listened carefully to what I had to say.
Providence Patient
Excellent care throughout the whole department. I was very impressed with all phases of my medical appointment care for my colonoscopy. Every person that I encountered was both kind and very helpful.
Providence Patient
I am 100% satisfied with my doctors and their staff never a bad or even mediocre experience Dr Vy Nguyen and Dr Elmer Chang are simply the best doctors I've ever seen
Providence Patient
Dr Chang is outstanding! I'm grateful for his care.
Providence Patient
Dr Chang is excellent
Providence Patient
He is the best
Providence Patient
Everyone was very professional and caring
Providence Patient
Dr. Chang is very caring, honest, and knowledgeable about my health conditions. He goes well beyond expectation on caring for all of my health needs.
Providence Patient
Dr. Elmer Chang goes beyond what is required to provide professional medical service
Providence Patient
Dr Chang is very thorough and has a kind and compassionate countenance, while being very efficient.
Providence Patient
Dr Chang is just the best. I am very comfortable with him. He always gives the time needed so I can talk to him about my health concerns. Never rushed. Excellent doctor. Staff is kind and helpful.
Providence Patient
Dr Chang was real caring, supportive and suggestive
Providence Patient
Dr Chang is an amazing Dr! I have seen him for many years as my GI specialist and will continue to in the future.
Providence Patient
Good
Providence Patient
Very personal experience, courteous and informative
Providence Patient
Dr Chang is an outstanding doctor who looks out for the best interests of his patients. He explains things clearly and thoroughly. I highly recommend him
Providence Patient
Good Dr.Chang always takes time. Never rushes
Providence Patient
Dr. Chang is thorough and knowledgable. He asks clarifying questions and repeats information to help determine exactly how best to treat the condition from which you are suffering. He is also kind and reassuring.
Providence Patient
Dr Chang is truly exceptional in every way that a patient could dream
Providence Patient
I trust Dr. Elmer Y Chang with my colon health care. He is very knowledgeable.
Providence Patient
Very efficient , new my background, made sure I understood his direction when referring to procedures he had ordered.
Providence Patient
Dr Chang is very professional and easy to talk with, also his staff was excellent.
Providence Patient
Clinical Interests
- Abdominal Pain
- Abnormal Bowel Movement
- Abnormal Liver Function Blood Test
- Abnormal Stool
- Achalasia
- Acute Pancreatitis
- Alcoholic Hepatitis
- Altered Bowel Habits
- Anemia
- Anorexia
- Autoimmune Enteropathy
- Autoimmune Hepatitis
- Barrett's Esophagus
- Benign Neoplasm Of Colon
- Biliary Tract Disease
- Blood In Stool
- Bravo Ph Test
- Breath Testing
- Bright Red Blood Per Rectum
- Burping
- Capsule Endoscopy
- Celiac Disease
- Cholangioscopy
- Cholangitis
- Cholecystitis
- Cholelithiasis
- Cholestasis
- Chronic Abdominal Pain
- Chronic Diarrhea
- Chronic Pancreatitis
- Cirrhosis
- Clostridium Difficile
- Clostridium Infections
- Cold Therapies
- Colitis
- Colon Polypectomy
- Colonic Inertia
- Colonic Polyps
- Colonoscopy
- Colorectal Screening
- Constipation
- Crigler Najjar Syndrome
- Cyclic Vomiting Syndrome
- Digestive Disorders
- Diverticular Disease
- Diverticulitis
- Diverticulosis
- Double Balloon Enteroscopy
- Duodenal Ulcer
- Duodenitis
- Dyspepsia
- Dysphagia
- End Stage Liver Disease
- Endoscopic Mucosal Resection
- Endoscopic Mucosal Resection Of Esophagus
- Endoscopic Mucosal Resection Of Large Colon Polyps
- Endoscopic Retrograde Cholangiopancreatography
- Endoscopic Ultrasound
- Endoscopy
- Eosinophilic Colitis
- Eosinophilic Enteritis
- Eosinophilic Esophagitis
- Eosinophilic Gastritis
- Epigastric Pain
- Eructation
- Esophageal Disease
- Esophageal Disorder
- Esophageal Diverticulum
- Esophageal Mass
- Esophageal Motility Disorders
- Esophageal Spasm
- Esophageal Stricture
- Esophageal Ulcer
- Esophageal Varices
- Esophagitis
- Fatty Liver
- Fecal Impaction
- Fecal Incontinence
- Feeding Tube Management
- Flatulence
- Focal Nodular Hyperplasia
- Gallbladder Disease
- Gallbladder Polyp
- Gastric Anomaly
- Gastric Ulcer
- Gastritis
- Gastroenteritis
- Gastroesophageal Reflux Disease
- Gastroesophageal Reflux Surgery
- Gastrointestinal (Gi) Cancer Screening
- Gastrointestinal Amyloid
- Gastrointestinal Bleeding
- Gastroparesis
- Gastroscopy
- Gastrostomy Closure Surgery
- Giardiasis
- Gluten Sensitivity
- Helicobacter Pylori
- Hematemesis
- Hematochezia
- Hemochromatosis
- Hepatitis
- Hepatitis B
- Hepatitis C
- Hereditary Colon Cancer
- Hiatal Hernia
- High Resolution Manometry
- Ileitis
- Inflammatory Bowel Disease
- Intestinal Obstruction
- Intractable Vomiting
- Irritable Bowel Syndrome
- Jaundice
- Lactose Intolerance
- Liver Disease
- Liver Mass
- Lynch Syndrome
- Malabsorption
- Melena
- Motility Disorders
- Nausea
- Non Alcoholic Fatty Liver Disease
- Non Alcoholic Steatohepatitis
- Obstipation
- Odynophagia
- Ogilvie Syndrome
- Pancreas Divisum
- Pancreatic Cyst
- Pancreatic Fistula
- Pancreatic Insufficiency
- Pancreatic Pseudocyst
- Pancreatic Steatorrhoea
- Pancreaticobiliary Disease
- Pancreatitis
- Paralytic Ileus
- Partial Small Bowel Obstruction (Sbo)
- Peptic Ulcer
- Peritonitis
- Peutz Jeghers Syndrome
- Polyposis Syndrome
- Portal Hypertension
- Portal Hypertensive Gastropathy
- Postprandial Diarrhea
- Primary Encopresis
- Proctitis
- Proctosigmoidoscopy
- Radiofrequency Ablation For Barrett's Esophagus
- Rectal Bleeding
- Rectal Pain
- Regional Enteritis
- Secondary Encopresis
- Short Bowel Syndrome
- Sigmoidoscopy
- Small Bowel Disease
- Stomach Cramps
- Stomach Disorders
- Swallowing Problem
- Ulcerative Colitis
- Virtual Care
- Vomiting
- Whipple's Disease
- Wilson's Disease
Dr. Chang is an exceptional physician! He is prepared, thorough, extremely knowledgeable, and respectful and makes me feel I am a valued patient.
Providence Patient