Eugene Yen, MD
NPI 1508944018 · Gastroenterology Physician · Evanston, IL
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Eugene Yen, MD is a Gastroenterology Physician provider in Evanston, IL (NPI 1508944018).
Provider details
- NPI number
- 1508944018
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036-117818 (IL)
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
383 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 78 | $136 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 55 | $270 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 41 | $155 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 39 | $104 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 30 | $116 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 20 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ustekinumabbrand: Stelara | 83 | 13 |
| Budesonidebrand: Budesonide Dr | 78 | 19 |
| Mesalamine | 49 | 17 |
| Nortriptyline Hcl | 47 | 11 |
| Sod Picosulf/Mag Ox/Citric Acbrand: Clenpiq | 47 | 47 |
| Dicyclomine Hcl | 42 | 19 |
| Pantoprazole Sodium | 29 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$70,450 across 83 records (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)
- 259 E Erie St Ste 1600Chicago, IL 60611-3111Phone: (312) 695-5620Fax: (312) 695-2310
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2024-02-01
- Certified
- 2024-02-01
Frequently asked questions
- What is Eugene Yen's NPI number?
- Eugene Yen's National Provider Identifier (NPI) is 1508944018, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Eugene Yen's specialty?
- Eugene Yen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Eugene Yen located?
- Eugene Yen's practice location on file with NPPES is 2650 Ridge Ave, Evanston, IL 60201-1718.
- What is Eugene Yen's phone number?
- The practice phone number listed in the NPPES registry for Eugene Yen is (847) 657-1900.
- Does Eugene Yen accept Medicare?
- Eugene Yen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Eugene Yen's NPI active?
- Yes — Eugene Yen's NPI (1508944018) is active in the NPPES registry as of the last update on 2024-02-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.