EC
21 Years of Experience
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Chang, Gastroenterologist in Mission Viejo, CA?
Dr. Elmer Chang, MD is a Gastroenterologist, who primarily practices in Mission Viejo, CA with 2 additional practice locations. He has been practicing for over 21 years and is board certified by the American Board of Internal Medicine. Dr. Chang graduated from Northwestern University The Feinberg School of Medicine and completed his residency at Ucla Med Ctr/Ucla D Geffen Sch, Gastroenterology; Baylor Coll Of Med, Internal Medicine. Dr. Chang is fluent in English and Chinese, and is currently seeing new patients. Dr. Chang’s practice accepts Kaiser Permanente, Medicaid, Medicare, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Chang’s office at (949) 364-5090.
Where did Dr. Chang go to medical school and complete their residency?
Residency: Ucla Med Ctr/Ucla D Geffen Sch, Gastroenterology; Baylor Coll Of Med, Internal Medicine
Medical School: Northwestern Uniiversity | Northwestern University The Feinberg School of Medicine
Is Dr. Chang board certified in Gastroenterologist?
Yes, Dr. Elmer Chang, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Chang speak?
Dr. Chang and their clinical team can communicate with patients in the following languages:
Chinese
English
What conditions does Dr. Chang treat?
As a Gastroenterologist, Dr. Chang diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. Chang. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly.
Also known as:
- Colon Cancer Screening
- Health Screening
- Colorectal Cancer Screening (PDQ®)
- Screening Tests to Detect Colorectal Cancer and Polyps
- Tests to Detect Colorectal Cancer and Polyps
- Colorectal Cancer Screening
- Colonoscopy Screening
- Bowel Cancer Screening
ICD-10 Codes:
- Z1211: Encounter for screening for malignant neoplasm of colon
Also known as:
- Colon Polyps
- Colonic Polyps
- Colorectal polyps
- Bowel polyps
- Intestinal polyps
ICD-10 Codes:
- K635: Polyp of colon
Also known as:
- Acid Reflux
- GERD with Esophagitis
- GERD
- Acid Reflux (GER & GERD) in Adults
- Acid Reflux (GER & GERD) in Children
- Acid Reflux (GER & GERD) in Infants
- Eosinophilic Esophagitis
- Gastroesophageal Reflux
- Heartburn
- Indigestion
- Reflux Esophagitis
- Acid Reflux Esophagus Inflammation
- Heartburn with Esophagus Damage
ICD-10 Codes:
- K219: Gastro-esophageal reflux disease without esophagitis
- K2100: Gastro-esophageal reflux disease with esophagitis, without bleeding
Also known as:
- Stomach or Duodenum Polyp
- Stomach Disorder
- Gastric Polyp
- Duodenal Polyp
- Stomach Growth
ICD-10 Codes:
- K317: Polyp of stomach and duodenum
Also known as:
- Benign Ascending Colon Polyp
- Benign Transverse Colon Polyp
- Benign Cecum Polyp
- Benign Tumor
- Colonic Polyps
- Colon Polyps
- Non-cancerous ascending colon growth
- Ascending colon adenoma
- Ascending colon benign tumor
- Non-cancerous transverse colon growth
- Transverse colon adenoma
- Transverse colon benign tumor
- Non-cancerous cecum growth
- Cecal adenoma
- Cecum benign tumor
ICD-10 Codes:
- D122: Benign neoplasm of ascending colon
- D123: Benign neoplasm of transverse colon
- D120: Benign neoplasm of cecum
Also known as:
- Difficulty Swallowing
- Swallowing Disorder
- Dysphagia
- Trouble swallowing
- Painful swallowing
ICD-10 Codes:
- R1310: Dysphagia, unspecified
Also known as:
- Upper Middle Abdominal Pain
- Left Upper Abdominal Pain
- Abdominal Pain
- Epigastric pain
- Pain below breastbone
- Upper stomach pain
- LUQ pain
- Pain in upper left stomach
- Left upper belly pain
ICD-10 Codes:
- R1013: Epigastric pain
- R1012: Left upper quadrant pain
Also known as:
- Chronic Idiopathic Constipation
- Constipation
- Functional Constipation
- Unexplained Chronic Constipation
- Long-Term Constipation
- Difficulty Passing Stool
- Infrequent Bowel Movements
- Hard Stools
ICD-10 Codes:
- K5904: Chronic idiopathic constipation
- K5900: Constipation, unspecified
Also known as:
- Chronic Stomach Inflammation
- Stomach Disorder
- Gastritis & Gastropathy
- Chronic gastritis
- Long-term stomach inflammation
- Persistent stomach lining inflammation
ICD-10 Codes:
- K2950: Unspecified chronic gastritis without bleeding
Also known as:
- Diaphragmatic Hernia
- Hernia
- Hiatal Hernia
- Hernia of the Diaphragm
ICD-10 Codes:
- K449: Diaphragmatic hernia without obstruction or gangrene
Also known as:
- Blocked Esophagus
- Esophagus Disorder
- Esophageal Obstruction
- Food Pipe Blockage
- Swallowing Difficulty
ICD-10 Codes:
- K222: Esophageal obstruction
Also known as:
- Diarrhea
- Loose stools
- Runny poop
- Frequent bowel movements
ICD-10 Codes:
- R197: Diarrhea, unspecified
Also known as:
- Non-Infectious Gastroenteritis and Colitis
- Digestive Disease
- Inflammation of Stomach and Intestines
- Non-Bacterial Colitis
- Gut Inflammation
ICD-10 Codes:
- K529: Noninfective gastroenteritis and colitis, unspecified
Also known as:
- Barrett's Esophagus
- Esophagus Disorder
- Barrett’s Esophagus
- Barrett's condition
- Esophageal metaplasia
ICD-10 Codes:
- K2270: Barrett's esophagus without dysplasia
Also known as:
- Abdominal Bloating
- Gas
- Gas in the Digestive Tract
- Bloated Stomach
- Swollen Belly
- Gaseous Distension
ICD-10 Codes:
- R140: Abdominal distension (gaseous)
Which procedures does Dr. Chang perform as a Gastroenterologist?
As a Gastroenterologist, procedures performed by a Dr. Elmer Chang may include:
- Colonoscopy
- Colonoscopy Consultation
- Colorectal Cancer Screening
- Endoscopic Ultrasound
- Endoscopy / Endoscopic Ultrasound
- Gastric Balloon
- Gastric Stimulator Implantation Consultation
- Gastric Stimulator Implantation Follow Up
For detailed information, please contact Dr. Chang's office.
Does Dr. Chang accept my insurance?
Dr. Chang accepts most major insurance plans. Important: Please call our office at (949) 364-5090 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Chang accept in Mission Viejo, CA?
Dr. Chang in Mission Viejo, CA accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Alignment Health Plan
All Other Third Party
Blue Shield of California
CalOptima
Centene
CVS Health (formerly Aetna)
Kaiser Permanente
Medicaid
Medicare
UnitedHealthcare
View All Insurances
Where is Dr. Chang's office located?
Dr. Elmer Chang's Primary Practice
27799 Medical Center Rd
Mission Viejo, CA 92691
(949) 364-5090
What is Dr. Chang's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Chang's National Provider Identifier (NPI) number is 1912083353.
What common questions do patients ask about Dr. Chang?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Chang
What is Dr. Elmer Chang's specialty?
Dr. Chang is a Gastroenterologist near Mission Viejo, CA. An internist focused on diagnosing and treating disorders of the digestive system, encompassing the stomach, intestines, liver, and gallbladder. This specialist manages conditions like abdominal pain, ulcers, diarrhea, cancer, and jaundice, and performs intricate diagnostic and therapeutic procedures using endoscopes to examine internal organs. Contact Dr. Chang to book an appointment today.
Is this Dr. Elmer Chang affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Chang is affiliated with Providence Mission Hospital Mission Viejo which is a Castle Connolly Top Hospital. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
Where can I learn more about Gastroenterologist?
Explore Gastroenterologist with insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Elmer Chang accepting new patients in Mission Viejo, CA?
Yes, Dr. Elmer Chang is accepting new patients at this time.
Does Dr. Elmer Chang offer online booking?
Please contact Dr. Chang's office at (949) 364-5090 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Elmer Chang?
Please contact Dr. Chang's office at (949) 364-5090 for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. Elmer Chang have?
Dr. Elmer Chang is certified by the American Board of Internal Medicine.
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