Stephen Chen, M.D.
NPI 1831221837 · Gastroenterology Physician · Tualatin, OR
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Chen, M.D. is a Gastroenterology Physician provider in Tualatin, OR (NPI 1831221837).
Provider details
- NPI number
- 1831221837
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- MD27258 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
408 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 99 | $243 |
| Pathology Examination of Tissue Using a Microscope, Intermediate Complexity88305 | 93 | $38 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 66 | $72 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 34 | $92 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 31 | $124 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 147 | 64 |
| Pantoprazole Sodium | 40 | 15 |
| Famotidine | 34 | 15 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 24 | 24 |
| Ondansetron Hcl | 21 | 21 |
| Rifaximinbrand: Xifaxan | 20 | — |
| Ondansetronbrand: Ondansetron Odt | 19 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$32 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 879 N Providence DrNewberg, OR 97132-7563Phone: (503) 692-3750Fax: (503) 691-2324
Registry dates
- Enumerated
- 2007-03-12
- Last updated
- 2023-11-28
- Certified
- 2023-11-28
Frequently asked questions
- What is Stephen Chen's NPI number?
- Stephen Chen's National Provider Identifier (NPI) is 1831221837, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Chen's specialty?
- Stephen Chen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Chen located?
- Stephen Chen's practice location on file with NPPES is 19250 Sw 90th Ave, Tualatin, OR 97062-7585.
- What is Stephen Chen's phone number?
- The practice phone number listed in the NPPES registry for Stephen Chen is (503) 692-3750.
- Does Stephen Chen accept Medicare?
- Stephen Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Chen's NPI active?
- Yes — Stephen Chen's NPI (1831221837) is active in the NPPES registry as of the last update on 2023-11-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.