Chun-Yang Michael Chang, MD
Gastroenterology Physician · Oregon City, OR
Chun-Yang Michael Chang, MD is a gastroenterology physician with a practice address in Oregon City, Oregon, and NPI 1033106034, issued on Oct 4, 2005. Check the license (Oregon MD23576, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Chun-Yang Michael Chang
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- MD23576 OR
Self-reported in NPPES; status is on the state search - Practice location
- 1508 Division St, Oregon City, OR 97045
- Phone
- (503) 692-3750
- Enumerated
- Oct 4, 2005
- Record last updated
- Nov 28, 2023
- Fax
- (503) 691-2324
- Medicaid IDs
- 1033106034 WA
286972 OR - Medicare enrollment
- Enrolled (PECOS I20100820000313); accepts Medicare assignment
- Medical or professional school
- Baylor College Of Medicine, 1996
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 281 in Oregon → Look up another NPI →
Also registered at 1508 Division St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michelle Alberts, MDFamily Medicine Physician1841273364
- Paul Anderson, M.D.Gastroenterology Physician1487870846
- James Ballard, MDOrthopaedic Surgery Physician1427083666
- Bradford Black, MDOrthopaedic Surgery Physician1710912951
- Arthur Cooper, M.D.Obstetrics & Gynecology Physician1770541831
- Marsha Davidson, FNPFamily Nurse Practitioner1871589457
Verify Chun-Yang Michael Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD23576Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% fewer Medicare Part D claims than the average gastroenterology physician in 2024
426 Medicare Part D claims for 207 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Omeprazole90 claims
- Ondansetron Hcl34 claims
- Gavilyte-G27 claims
- Sod Sulf-Potass Sulf-Mag Sulf24 claims
- Pantoprazole Sodium20 claims
- Ondansetron Odt17 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $31.95
1 payment: food and beverage; the largest payer was Janssen Biotech, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- The Oregon Clinic, PCOregon City, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Chun-Yang Michael Chang among 281 gastroenterology physician records in Oregon
Chun-Yang Michael Chang, MD is one of 281 gastroenterology physician records with a practice address in Oregon. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 80% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1996 · median 2003 among the 201 with a school on file
- Record last updated2023 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Oregon
There are 281 gastroenterology physician records in Oregon.
All 281 in Oregon → Every provider in Oregon City → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Paul Anderson, M.D.Oregon City, OR 970451487870846
- Brian Applebaum, M.D.Oregon City, OR 970451710073200
- William Ferrin, MDOregon City, OR 970451568458156
- Thomas Huber, MDOregon City, OR 970451740205830
- Steven Mason, MDOregon City, OR 970451174519524
- Monina Pascua, MDOregon City, OR 970451144382425
- Jaime Scott, MDOregon City, OR 970451841829314
- Michael Sheffield, MDOregon City, OR 970451083600431
Common questions
What is Chun-Yang Michael Chang, MD's NPI number?
Chun-Yang Michael Chang, MD's National Provider Identifier (NPI) is 1033106034, issued on Oct 4, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Chun-Yang Michael Chang, MD located?
The NPPES record lists a practice address at 1508 Division St, Oregon City, OR, 97045. Phone: (503) 692-3750. Providers update this record themselves, so call before visiting.
How can I verify Chun-Yang Michael Chang, MD's license?
NPPES lists Oregon license number MD23576, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Chun-Yang Michael Chang, MD prescribe under Medicare Part D?
In 2024, Chun-Yang Michael Chang, MD had 426 Medicare Part D claims for 207 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.