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Dr. Chun-Yang Michael Chang, MD

(No ratings)

Specializes in: Adult Gastroenterology
University of California, Irvine, School of Medicine (1999)
Professional interests include: gastrointestinal problems (digestive disorders), small intestine disorders, hepatobiliary disorders
1130 Molalla Avenue
Oregon City, OR 97045

Dr. Chun-Yang Michael Chang, MD is a gastroenterologist in Oregon City, OR specializing in adult gastroenterology. He graduated from University of California, Irvine, School of Medicine in 1999 and has 27 years of experience. Dr. Chun-Yang Michael Chang, MD is affiliated with The Oregon Clinic.

View Doctor's Full Profile (503) 692-3750

Office Locations

The Oregon Clinic

1130 Molalla Avenue
Oregon City, OR 97045
(503) 692-3750
(503) 691-2324
open_in_new
1508 Division Street Suite 15
Oregon City, OR 97045
open_in_new
19250 Sw 90th Avenue
Tualatin, OR 97062
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Some issues Dr. Chun-Yang Michael Chang, MD can help you with:

Gastrointestinal Problems (Digestive Disorders)

The gastrointestinal system, or GI tract, is the name given to a collection of organs that work together to digest food. These organs fit together in a long tube, running from the mouth to the anus, and include the esophagus, stomach, and intestines, among others. With so many parts working together, complicated by today's busy lifestyles and diets, digestive problems are common. As many as 1 in 3 Americans have a digestive or GI disorder. There are a huge variety of digestive problems, but the most common are IBS, constipation, GERD, hemorrhoids, and ulcers.

IBS, or irritable bowel syndrome, happens when the muscles surrounding the colon contract too easily or frequently. The result is abdominal pain, cramps, diarrhea or constipation, gas and bloating. IBS attacks can often be brought on by specific triggers, so a key part of treatment is learning which foods trigger IBS attacks and avoiding them. Treatment also includes exercise, avoiding stress, and medications if needed.

Constipation, or large, hard, or infrequent stools, happens to everyone at some point. It can be caused by a disruption in routine or food, or by eating a diet without many fresh fruits and vegetables. Although it is uncomfortable, constipation is common and usually not serious, but it can sometimes become chronic. Adding fiber to the diet, exercising, and taking medications may help.

GERD, or gastroesophageal reflux disease, is a severe form of chronic heartburn where stomach acid spills back up into the esophagus. Left untreated, the acid may even eat away at the esophagus and cause serious damage. Treatment includes changing the diet to avoid trigger foods, losing weight if needed, medications, or even surgery.

Hemorrhoids are blood vessels around the rectum that become irritated, swollen or torn while straining during a bowel movement. They are most often caused by constipation, but can also be caused by pregnancy, diarrhea, or simply a genetic predisposition towards hemorrhoids. Treatment involves first treating any constipation issues, then keeping the area clean and soothed until it has healed. If these measures are ineffective, surgery is sometimes used.

Peptic ulcers are sores or spots of inflammation in the lining of the stomach or close to the stomach in the small intestine. Usually this area is coated with a protective lining that shields the tissue from the strong stomach acid, but a break in the lining can let acid in, causing the sores. It used to be thought that stress caused ulcers, but now it is known that is not the case. Most often, they are caused by an infection by H. pylori bacteria, but ulcers can also be caused by alcohol abuse or overuse of aspirin, ibuprofen, naproxen, or other NSAIDS. The symptoms of an ulcer are pain, hunger, nausea, and fatigue.

Gastrointestinal problems, perhaps more than any other area, are markedly affected by lifestyle. Many disorders can be prevented or treated at least in part by eating a healthy diet high in fiber, exercising regularly, drinking enough water, and limiting alcohol intake. Still, the frequency of digestive disorders means that even the healthiest person can be affected by them. Anyone who notices blood in their stool, experiences abdominal pain, unexplained weight loss, or any significant change in bowel movements should see a doctor.

In The News (see more mentions in the news)

Medicare Procedure and Patient Information

2012 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2012 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 127
doctor visit 173
gastrointestinal procedures 164
hospital care 47
inpatient care 47
lab tests 22
minimally invasive procedures 164
preventive care 23
removal of lesion (e.g. growth) 127

Medicare Procedure and Patient Information

2013 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2013 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 129
doctor visit 176
gastrointestinal procedures 195
hospital care 18
inpatient care 18
lab tests 15
minimally invasive procedures 195
preventive care 45
removal of lesion (e.g. growth) 129

2013 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 106
Female 144
Ethnicity
Non-Hispanic White 229
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 140
From 75 to 84 62
85 and over 17
Less than 65 31

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2013

Hypertension 49
High Cholesterol 48
Stroke 0
Ischemic Heart Disease 22
Depression 18
Chronic Kidney Disease 20
Asthma 7
Osteoperosis 4
Atrial Fibrilation 9
Heart Failure 14
Chronic Obstructive Pulmonary Disease 10
Diabetes 24
Dementia 5
Cancer 9

Medicare Procedure and Patient Information

2014 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2014 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 124
doctor visit 105
gastrointestinal procedures 150
hospital care 43
inpatient care 43
lab tests 15
minimally invasive procedures 150
preventive care 11
removal of lesion (e.g. growth) 124

2014 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 94
Female 122
Ethnicity
Non-Hispanic White 202
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 113
From 75 to 84 44
85 and over 24
Less than 65 35

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2014

Hypertension 59
High Cholesterol 50
Stroke 5
Ischemic Heart Disease 28
Depression 24
Chronic Kidney Disease 22
Asthma 0
Osteoperosis 7
Atrial Fibrilation 11
Heart Failure 16
Chronic Obstructive Pulmonary Disease 12
Diabetes 23
Dementia 5
Cancer 12

Medicare Procedure and Patient Information

2015 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2015 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 111
doctor visit 125
esophageal dilation 14
gastrointestinal procedures 149
hospital care 43
inpatient care 43
minimally invasive procedures 149
preventive care 12
removal of lesion (e.g. growth) 111

2015 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 190
Female 274
Ethnicity
Non-Hispanic White 428
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 246
From 75 to 84 128
85 and over 34
Less than 65 56

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2015

Hypertension 59
High Cholesterol 47
Stroke 6
Ischemic Heart Disease 21
Depression 22
Chronic Kidney Disease 23
Asthma 13
Osteoperosis 6
Atrial Fibrilation 14
Heart Failure 13
Chronic Obstructive Pulmonary Disease 14
Diabetes 24
Dementia 7
Cancer 12

Medicare Procedure and Patient Information

2016 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2016 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 92
doctor visit 131
gastrointestinal procedures 139
hospital care 26
inpatient care 26
minimally invasive procedures 139
preventive care 31
removal of lesion (e.g. growth) 92

2016 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 108
Female 115
Ethnicity
Non-Hispanic White 201
Black 0
Hispanic 0
Asian 0
Other 11
Native American 0
Age
From 65 to 74 121
From 75 to 84 57
85 and over 11
Less than 65 34

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2016

Hypertension 58
High Cholesterol 49
Stroke 0
Ischemic Heart Disease 24
Depression 17
Chronic Kidney Disease 29
Asthma 14
Osteoperosis 6
Atrial Fibrilation 10
Heart Failure 12
Chronic Obstructive Pulmonary Disease 10
Diabetes 26
Dementia 0
Cancer 12

Medicare Procedure and Patient Information

2017 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2017 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 119
doctor visit 100
gastrointestinal procedures 133
hospital care 22
inpatient care 22
minimally invasive procedures 133
preventive care 14
removal of lesion (e.g. growth) 119

2017 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 110
Female 104
Ethnicity
Non-Hispanic White 190
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 124
From 75 to 84 57
85 and over 0
Less than 65 0

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2017

Hypertension 59
High Cholesterol 30
Stroke 0
Ischemic Heart Disease 25
Depression 25
Chronic Kidney Disease 24
Asthma 7
Osteoperosis 8
Atrial Fibrilation 11
Heart Failure 13
Chronic Obstructive Pulmonary Disease 10
Diabetes 25
Dementia 0
Cancer 11

Medicare Procedure and Patient Information

2018 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2018 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 125
doctor visit 126
esophageal dilation 11
gastrointestinal procedures 170
minimally invasive procedures 170
preventive care 34
removal of lesion (e.g. growth) 125

2018 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 139
Female 124
Ethnicity
Non-Hispanic White 241
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 138
From 75 to 84 78
85 and over 21
Less than 65 0

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2018

Hypertension 54
High Cholesterol 45
Stroke 4
Ischemic Heart Disease 19
Depression 15
Chronic Kidney Disease 22
Asthma 6
Osteoperosis 7
Atrial Fibrilation 13
Heart Failure 12
Chronic Obstructive Pulmonary Disease 7
Diabetes 23
Dementia 7
Cancer 8

Medicare Procedure and Patient Information

2019 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2019 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 136
doctor visit 92
esophageal dilation 14
gastrointestinal procedures 182
minimally invasive procedures 182
preventive care 32
removal of lesion (e.g. growth) 136

2019 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 108
Female 140
Ethnicity
Non-Hispanic White 229
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 139
From 75 to 84 69
85 and over 11
Less than 65 29

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2019

Hypertension 56
High Cholesterol 45
Stroke 0
Ischemic Heart Disease 20
Depression 23
Chronic Kidney Disease 25
Asthma 6
Osteoperosis 11
Atrial Fibrilation 7
Heart Failure 10
Chronic Obstructive Pulmonary Disease 10
Diabetes 23
Dementia 8
Cancer 12

Medicare Procedure and Patient Information

2020 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2020 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 78
doctor visit 91
gastrointestinal procedures 106
minimally invasive procedures 106
preventive care 16
removal of lesion (e.g. growth) 78

2020 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 93
Female 103
Ethnicity
Non-Hispanic White 176
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 109
From 75 to 84 46
85 and over 12
Less than 65 29

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2020

Hypertension 51
High Cholesterol 44
Stroke 0
Ischemic Heart Disease 23
Depression 22
Chronic Kidney Disease 28
Asthma 9
Osteoperosis 10
Atrial Fibrilation 12
Heart Failure 15
Chronic Obstructive Pulmonary Disease 11
Diabetes 26
Dementia 0
Cancer 10

Medicare Procedure and Patient Information

2021 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2021 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 106
doctor visit 85
gastrointestinal procedures 117
hospital care 32
inpatient care 32
minimally invasive procedures 117
preventive care 11
removal of lesion (e.g. growth) 106

2021 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 105
Female 113
Ethnicity
Non-Hispanic White 200
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 120
From 75 to 84 61
85 and over 17
Less than 65 20

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2021

Hypertension 59
High Cholesterol 49
Stroke 0
Ischemic Heart Disease 26
Depression 27
Chronic Kidney Disease 32
Asthma 5
Osteoperosis 10
Atrial Fibrilation 11
Heart Failure 17
Chronic Obstructive Pulmonary Disease 8
Diabetes 26
Dementia 9
Cancer 12

Medicare Procedure and Patient Information

2022 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2022 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 80
doctor visit 95
gastrointestinal procedures 97
minimally invasive procedures 97
preventive care 17
removal of lesion (e.g. growth) 80

2022 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 98
Female 103
Ethnicity
Non-Hispanic White 178
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 105
From 75 to 84 65
85 and over 15
Less than 65 16

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2022

Hypertension 66
High Cholesterol 68
Stroke 6
Ischemic Heart Disease 21
Depression 22
Chronic Kidney Disease 16
Asthma 9
Osteoperosis 16
Atrial Fibrilation 11
Heart Failure 12
Chronic Obstructive Pulmonary Disease 11
Diabetes 24
Dementia 5
Cancer 15

Medicare Procedure and Patient Information

2023 Medicare Procedure Volume

The top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR during 2023 were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

diagnostic procedures 77
doctor visit 66
gastrointestinal procedures 98
minimally invasive procedures 98
preventive care 21
removal of lesion (e.g. growth) 77

2023 Medicare Patient Data

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 80
Female 118
Ethnicity
Non-Hispanic White 177
Black 0
Hispanic 0
Asian 0
Other 0
Native American 0
Age
From 65 to 74 111
From 75 to 84 61
85 and over 12
Less than 65 14

Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD in 2023

Hypertension 55
High Cholesterol 59
Stroke 0
Ischemic Heart Disease 15
Depression 26
Chronic Kidney Disease 13
Asthma 8
Osteoperosis 15
Atrial Fibrilation 13
Heart Failure 9
Chronic Obstructive Pulmonary Disease 11
Diabetes 19
Dementia 0
Cancer 19

Medicare Procedure and Patient Information

Average Medicare Procedure Volume From 2012 - 2023

Volume of procedures performed by Dr. Chun-Yang Michael Chang, MD for Medicare patients.

The highest averages for the top procedures that Dr. Chun-Yang Michael Chang, MD treated as a gastroenterologist in Oregon City, OR were minimally invasive procedures, gastrointestinal procedures, removal of lesion (e.g. growth) and diagnostic procedures.

diagnostic procedures 108
doctor visit 113
esophageal dilation 13
gastrointestinal procedures 141
hospital care 33
inpatient care 33
lab tests 17
minimally invasive procedures 141
preventive care 22
removal of lesion (e.g. growth) 108

Average Medicare Patient Data From 2012 - 2023

Information about Medicare patients treated by Dr. Chun-Yang Michael Chang, MD.

Gender
Male 102
Female 121
Ethnicity
Black / African American 0
Asian / Pacific Islander 0
Non-Hispanic White 204
Hispanic 0
Native American / Alaskan Native 0
Other 0
Age
75 to 84 60
85 and over 14
Less than 65 22
65 to 74 122

Average of Total of Conditions of Medicare patients treated by Dr. Chun-Yang Michael Chang, MD From 2012 - 2023

The highest averages of the most common conditions of Medicare patients that Dr. Chun-Yang Michael Chang, MD treated were hypertension, high cholesterol, chronic kidney disease and diabetes.

Hypertension 52
High Cholesterol 44
Stroke 1
Ischemic Heart Disease 20
Depression 20
Chronic Kidney Disease 21
Asthma 7
Osteoporosis 8
Heart Failure 11
Chronic Obstructive Pulmonary Disease 9
Diabetes 21
Atrial Fibrillation 10
Cancer 11
Dementia 3

Education & Training

Dr. Chun-Yang Michael Chang, MD graduated from University of California, Irvine, School of Medicine in 1999. He completed residency at University of California, Irvine Affiliated Hospitals. He is certified by the Board Certification: Gastroenterology and has a state license in Oregon.

Medical School: University of California, Irvine, School of Medicine (1999)

Residency: University of California, Irvine Affiliated Hospitals

Board Certification: Board Certification: Gastroenterology

Licensed In: Oregon

Affiliations & Hospitals

Dr. Chun-Yang Michael Chang, MD is associated with these hospitals and organizations:

The Oregon Clinic

Ratings & Reviews

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General Payments

These charts describe general payments received by Dr. Chun-Yang Michael Chang, MD. Doctors may receive payments for a number of reasons, including meal compensation, travel compensation, and consulting.

Payments by Company
COMSORT, Inc $100 VICTRELIS
$100
Janssen Biotech, Inc. $32 STELARA
$32
AbbVie Inc. $25 Rinvoq
$25
Takeda Pharmaceuticals America, Inc. $12 ENTYVIO
$12
Covidien LP $11 GI Solutions
$11
Types of Payments
Consulting Fee $100
Food and Beverage $80

Biography

Dr. C-Y Chang practices adult gastroenterology in Oregon City, OR and Tualatin, OR. His clinical interests include hepatobiliary disorders and small intestine disorders. Dr. Chang is affiliated with Legacy Meridian Park Medical Center, The Oregon Clinic, and Providence Newberg Medical Center. Before completing his residency at a hospital affiliated with the University of California, Irvine, Dr. Chang attended medical school at the University of California, Irvine, School of Medicine and Baylor College of Medicine. Awards and/or distinctions he has received include Portland Monthly Magazine; "Top Doctors"; and Cum Laude, UCLA.

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