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Dr. John T. Chang, MD, AGAF

(John T. Chang, MD, AGAF, FACG)

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Specializes in: Gastroenterology (Digestive System), General Practice and Internal Medicine (Adult Medicine)

Temple University School of Medicine

Professional interests include: inflammatory bowel disease, microscopic colitis, Crohn's disease, and more.

9300 Campus Point Drive
San Diego, CA 92037

(619) 543-2347

Dr. John T. Chang, MD, AGAF is a gastroenterologist in San Diego, CA specializing in gastroenterology (digestive system), general practice and internal medicine (adult medicine). He graduated from Temple University School of Medicine. Dr. John T. Chang, MD, AGAF is affiliated with UC San Diego Health, U.S. Department of Veterans Affairs and UC San Diego Health.

Office Locations

9300 Campus Point Drive
San Diego, CA 92037

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200 W. Arbor Drive
San Diego, CA 92103

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3350 La Jolla Village Drive San Diego Vahcs (664)
San Diego, CA 92161

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4250 First Avenue
San Diego, CA 92103

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477 North El Camino Real
Encinitas, CA 92024

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6655 Alvarado Road
San Diego, CA 92120

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In The News

“Gastroenterologist and immunologist John Chang of the University of California, San Diego, also considered this a "reasonable explanation."”—"Inflammatory bowel disease: How stress affects the gut", The Weston Forum, May 2023

Noteworthy Medicare Patient Procedures Performed by Dr. John T. Chang, MD, AGAF in 2024

Click on any procedure below to see further details on volume and pricing among Medicare patients.

Top 10%

By Volume:

colonoscopy

colonoscopy with biopsy

colonoscopy with lesion removal

endoscopy

gastrointestinal biopsy

In 2024, Dr. John T. Chang, MD, AGAF performed more colonoscopy, colonoscopy with biopsy, colonoscopy with lesion removal, endoscopy, and gastrointestinal biopsy procedures for Medicare patients than 90% of providers in related specialties within California.

Top 25%

By Volume:

gastrointestinal procedures

removal of lesion

In 2012, Dr. John T. Chang, MD, AGAF performed more gastrointestinal procedures, and removal of lesion (e.g. growth) procedures for Medicare patients than 75% of providers in related specialties within California.

Medicare Procedure and Patient Information

2024 Medicare Procedure Volume

The top procedures that Dr. John T. Chang, MD, AGAF treated as a gastroenterologist in San Diego, CA during 2024 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. John T. Chang, MD, AGAF for Medicare patients.

diagnostic procedures	293
gastrointestinal procedures	321
minimally invasive procedures	321
preventive care	15
removal of lesion (e.g. growth)	293

2024 Medicare Patient Data

Information about Medicare patients treated by Dr. John T. Chang, MD, AGAF.

**Gender**
Male	91
Female	123

**Ethnicity**
Non-Hispanic White	152
Black	0
Hispanic	17
Asian	23
Other	0
Native American	0

**Age**
From 65 to 74	135
From 75 to 84	49
85 and over	0
Less than 65	0

Conditions of Medicare patients treated by Dr. John T. Chang, MD, AGAF in 2024

Hypertension	56
High Cholesterol	70
Stroke	0
Ischemic Heart Disease	19
Depression	27
Chronic Kidney Disease	18
Asthma	12
Osteoperosis	20
Atrial Fibrilation	13
Heart Failure	10
Chronic Obstructive Pulmonary Disease	7
Diabetes	22
Dementia	5
Cancer	24

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2024 - 2024

Volume of procedures performed by Dr. John T. Chang, MD, AGAF for Medicare patients.

The highest averages for the top procedures that Dr. John T. Chang, MD, AGAF treated as a gastroenterologist in San Diego, CA were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

diagnostic procedures	293
gastrointestinal procedures	321
minimally invasive procedures	321
preventive care	15
removal of lesion (e.g. growth)	293

Average Medicare Patient Data From 2024 - 2024

Information about Medicare patients treated by Dr. John T. Chang, MD, AGAF.

**Gender**
Male	91
Female	123

**Ethnicity**
Black / African American	0
Asian / Pacific Islander	23
Non-Hispanic White	152
Native American / Alaskan Native	0
Hispanic	17
Other	0

**Age**
75 to 84	49
85 and over	0
Less than 65	0
65 to 74	135

Average of Total of Conditions of Medicare patients treated by Dr. John T. Chang, MD, AGAF From 2024 - 2024

The highest averages of the most common conditions of Medicare patients that Dr. John T. Chang, MD, AGAF treated were high cholesterol, hypertension, depression and atrial fibrilation.

Hypertension	56
High Cholesterol	70
Stroke	0
Ischemic Heart Disease	19
Depression	27
Chronic Kidney Disease	18
Asthma	12
Osteoporosis	20
Heart Failure	10
Chronic Obstructive Pulmonary Disease	7
Diabetes	22
Atrial Fibrillation	13
Cancer	24
Dementia	5

Education & Training

Dr. John T. Chang, MD, AGAF graduated from Temple University School of Medicine. He completed residency at Hospital of the University of Pennsylvania. He is certified by the Board Certification: Gastroenterology and has a state license in California.

Medical School: Temple University School of Medicine

Residency: Hospital of the University of Pennsylvania

Board Certification: Board Certification: Gastroenterology

Licensed In: California

Affiliations & Hospitals

Dr. John T. Chang, MD, AGAF is associated with these hospitals and organizations:

UC San Diego Health

U.S. Department of Veterans Affairs

UC San Diego Health

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General Payments

These charts describe general payments received by Dr. John T. Chang, MD, AGAF. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

**Payments by Company**
Merck Sharp & Dohme LLC	$13,534 $13,534
AbbVie Inc.	$6,927 $6,927
Novartis Pharmaceuticals Corporation	$4,609 ZYKADIA $4,593	SANDOSTATIN LAR $16
Pfizer Inc.	$3,200 XELJANZ $3,200
Abbott Laboratories	$101 Vascular $101
Other	$177 ENTYVIO $53	FLEXIVA $19	Compliance EndoKit $15	$90

**Types of Payments**
Consulting Fee	$25,150
Travel and Lodging	$2,687
Food and Beverage	$657
Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program	$53

Research Payments

Dr. John T. Chang, MD, AGAF has received 8 research payments totaling $49,447.

Biography

Dr. John Chang's areas of specialization are general practice and gastroenterology (digestive system). His areas of expertise consist of crohn's disease, microscopic colitis, and ulcerative colitis. He is professionally affiliated with UC San Diego Health, Regents of the University of California, and U.S. Department of Veterans Affairs. Dr. Chang attended medical school at Temple University School of Medicine. Dr. Chang's medical residency was performed at Hospital of the University of Pennsylvania.