Dr. Chun-Yang Michael Chang, MD
- Medicare services, 2024
- 260
- Medicare patients, 2024
- 183
- Part D claims, 2024
- 426
- Hospital affiliations
- 3
- Industry payments
- $93
- Practice address
- 19250 Sw 90th Ave, Tualatin, OR 97062
- Practice phone
- Call (503) 692-3750
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Gastroenterology South - Tualatin
Tualatin, Oregon
Find Dr. Chang's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Chun-Yang Michael Chang is a gastroenterologist in Tualatin, Oregon
Dr. Chang practices at Gastroenterology South - Tualatin in Tualatin, Oregon.
Dr. Chang's NPI, 1033106034, was assigned on October 4, 2005. Dr. Chang graduated from Baylor College Of Medicine in 1996. Dr. Chang's Oregon license number on file is MD23576.
- NPI
- 1033106034NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4183651359
- NPI enumeration date
- October 4, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (503) 692-3750
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Chun-Yang Michael Chang practices at Gastroenterology South - Tualatin in Tualatin, Oregon
Dr. Chang's primary practice is Gastroenterology South - Tualatin, at 19250 Sw 90th Ave, Tualatin, OR 97062 in Washington County. The practice phone is (503) 692-3750.
- Gastroenterology South - Tualatin19250 Sw 90th Ave, Tualatin, OR 97062 · Washington CountyPhone(503) 692-3750
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Chun-Yang Michael Chang is affiliated with 4 sites of care and 1 medical group
Dr. Chang's primary practice is Gastroenterology South - Tualatin in Tualatin, Oregon. Dr. Chang is also affiliated with Legacy Meridian Park Medical Center. The medical group on file is The Oregon Clinic. Dmand AI also links Dr. Chang to 2 more hospitals, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Chun-Yang Michael Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gastroenterology South - Tualatin | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Chun-Yang Michael Chang is one of 226 gastroenterologists in Oregon
Gastroenterology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Chang is board certified in gastroenterology by the American Board of Internal Medicine. Dmand AI has Dr. Chang's licenses on file in 2 states: Oregon and California.
Specialties and state licenses
- Gastroenterology, OregonPrimary
- California license
Clinical focus
Dmand AI lists acid reflux, acute gastroduodenitis, chronic indigestion, chronic inflammatory bowel disease (IBD), cirrhosis of the liver, colonoscopy, intestinal or bowel obstruction and irritable bowel syndrome (IBS) among the conditions Dr. Chang treats.
Gastroenterologists near Dr. Chang
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Chun-Yang Michael Chang billed Medicare for 260 services in 2024
CMS data shows 260 Medicare services from Dr. Chang across 9 procedure codes in 2024, for 183 Medicare patients. Medicare paid $25,122 for them.
Dr. Chang's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Lab and pathology
- 2023: 1082024: 8918%
- Surgery
- 2023: 772024: 849%
- Office and hospital visits
- 2023: 662024: 718%
- Other services
- 2023: 212024: 1624%
Where Dr. Chang's Medicare services took place, 2024
- In an office14957%
- In a facility11143%
Dr. Chang compared with the Oregon median for gastroenterologists, 2024
- Dr. Chang
- Oregon median
- Medicare services
- 260vs 273Close to median
- Medicare patients
- 183vs 190Close to median
- Part D claims
- 240vs 34029% below
Medians across 224 gastroenterologists in Oregon with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other gastroenterologists in Oregon.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Chun-Yang Michael Chang treated 183 Medicare patients in 2024, average age 72
CMS counts 183 Medicare patients who saw Dr. Chang in 2024. The largest group is 65 to 74, with 99 patients. 68% of them have high cholesterol, and 63% have high blood pressure. 11% are also on Medicaid. Their average risk score is 1.22, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 65, with 59% women.
Dr. Chang's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Chang's Medicare patients by sex, 2024
- Women9150%
- Men9250%
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High cholesterol68%
- High blood pressure63%
- Arthritis37%
- Chronic kidney disease26%
- Diabetes26%
- Ischemic heart disease20%
- Mood disorders20%
- Anxiety19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women59%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Chun-Yang Michael Chang wrote 426 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 426 Medicare Part D claims for 207 patients. 87% of them were for generic drugs. CMS names the drug for 240 of them, across 8 drugs with 11 or more claims each, at $6,299 in total drug cost. In 2023, CMS named 320 claims across 12 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic369 claims87%
- Brand-name and other57 claims13%
Dr. Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Chang's Part D claims, 2024
- Antibiotics5%22 of 426 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3202024: 24025%
Drugs named by CMS: 8 in 2024, 12 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Chun-Yang Michael Chang ranks in the 65th percentile for colonoscopy in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chang as offering telehealth. CMS counts 54 procedures of colonoscopy by Dr. Chang, more than 65% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Where Dr. Chang ranks in Medicare procedure volume
- Colonoscopy
- 65th percentile54 procedures
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 64th percentile52 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Chun-Yang Michael Chang received $93 in industry payments from 2017 to 2024
CMS Open Payments shows 3 general payments to Dr. Chang from 3 drug and device companies from 2017 to 2024. Food and beverage make up the largest share, 100% of the total. Pfizer Inc. paid the most, $36.
General payments to Dr. Chang by program year, 2017 to 2024
Companies that paid Dr. Chang the most, 2017 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Chun-Yang Michael Chang graduated from Baylor College Of Medicine
Dr. Chang graduated from Baylor College Of Medicine in 1996.
- Medical school
- Board certified in gastroenterology
Source: Dmand AI Professional Profile Data
Dr. Chun-Yang Michael Chang accepts plans from 15 insurance carriers
Dr. Chang is in network with 15 carriers, including Elevance, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- Cigna
- HCSC
- Regence Health Plans
- Aetna
- Aspirus Health Plan
- +7 more carriersWith a free account
Plan types Dr. Chang accepts, by number of carriers
- PPO10
- HMO9
- Medicare6
- EPO3
- POS3
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Chun-Yang Michael Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Chun-Yang Michael Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Chun-Yang Michael Chang's NPI number?
Dr. Chun-Yang Michael Chang's NPI number is 1033106034. It was assigned on October 4, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Chun-Yang Michael Chang?
Dr. Chun-Yang Michael Chang is a gastroenterologist in Tualatin, Oregon. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Chun-Yang Michael Chang practice?
Dr. Chang practices at 19250 Sw 90th Ave, Tualatin, OR 97062. Dr. Chang's primary practice is Gastroenterology South - Tualatin in Tualatin, Oregon. Dmand AI also links Dr. Chang to 2 hospitals.
What is Dr. Chun-Yang Michael Chang's office phone number?
The practice phone on file for Dr. Chang is (503) 692-3750.
What is Dr. Chun-Yang Michael Chang's medical license number?
Dr. Chang's Oregon license number on file is MD23576, one of the licenses on file in 2 states.
Which states has Dr. Chun-Yang Michael Chang been licensed in?
Dmand AI has state licenses on file for Dr. Chang in Oregon (2002 to 2025) and California (since 1998).
Which hospitals is Dr. Chun-Yang Michael Chang affiliated with?
Dr. Chang is affiliated with Legacy Meridian Park Medical Center. Dmand AI links Dr. Chang to 2 more hospitals.
What medical group is Dr. Chun-Yang Michael Chang part of?
Dr. Chang is linked to The Oregon Clinic.
Does Dr. Chun-Yang Michael Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 260 services in 2024, and Dr. Chang accepts Medicare assignment.
Does Dr. Chun-Yang Michael Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chang as offering telehealth services.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. Chun-Yang Michael Chang see?
CMS counts 183 Medicare patients who saw Dr. Chang in 2024, with an average age of 72.
Is Dr. Chun-Yang Michael Chang board certified?
Yes. Dr. Chang is board certified in gastroenterology by the American Board of Internal Medicine.
What services does Dr. Chun-Yang Michael Chang bill to Medicare?
In 2024, Dr. Chang's most billed Medicare services were lab and pathology test (88305), surgery: digestive system (45385) and office visit, established patient (99213).
Where did Dr. Chun-Yang Michael Chang go to medical school?
Dr. Chang graduated from Baylor College Of Medicine in 1996.
What drugs does Dr. Chun-Yang Michael Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Omeprazole, Ondansetron HCl and Gavilyte-G.
Has Dr. Chun-Yang Michael Chang received payments from drug or device companies?
CMS Open Payments shows $93 in general payments to Dr. Chang from 3 companies from 2017 to 2024. The largest total came from Pfizer Inc.
How long has Dr. Chun-Yang Michael Chang been practicing?
Dr. Chang graduated from medical school in 1996, 30 years ago.
What insurance does Dr. Chun-Yang Michael Chang accept?
Dr. Chang is in network with 15 carriers, including Elevance, United Healthcare and Blue Cross Blue Shield of Michigan. PPO plans come from the most carriers, 10. Check the plan with the practice before a visit.
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