Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Stephen Lumin Chen, MD

Individual provider Gastroenterology Physician · NPI 1831221837

Stephen Lumin Chen, MD practises Gastroenterology in Tualatin, Oregon. Graduated from University of Chicago, Pritzker School of Medicine in 2001, 25 years ago. Practices with The Oregon Clinic, PC, a 352-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Oregon.

Years since qualifying
25
Trained at
University of Chicago, Pritzker School of Medicine
Licensed in
OR
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

19250 SW 90th Ave
Tualatin, OR 97062-7585
Phone: (503) 692-3750
Fax: (503) 691-2324
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 879 N Providence Dr, Newberg, OR 97132-7563 — (503) 692-3750

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence MD27258 (OR)

Record details

NPI number1831221837
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 12, 2007
Last updated in NPPESNovember 28, 2023
Certification dateNovember 28, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Medical schoolUNIVERSITY OF CHICAGO, PRITZKER SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice The Oregon Clinic, Pc — 352 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Upper gastrointestinal (GI) endoscopy for acid reflux 94 times · 75th percentile
Colonoscopy 56 times · 66th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients267
Services billed 1,224 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $377 9 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Salem Hospital Hospital · Salem, OR
  • Legacy Meridian Park Medical Center Hospital · Tualatin, OR
  • Providence Newberg Medical Center Hospital · Newberg, OR
  • Providence Willamette Falls Medical Center Hospital · Oregon City, OR

Colleagues at The Oregon Clinic, PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 352 clinicians in the practice; 12 are shown here.

Other providers in Tualatin