Dr. Eugene F. Yen, MD
Gastroenterology (Gastroenterology Physician)
2650 Ridge Ave, Suite G221
Evanston, IL 60201
Who else practices at this address →
Cook County includes primary care (3% of residents) and mental health (4% of residents) shortage areas. About shortage areas
- Medicare participating
At a glance
- Medical school
- Tufts University School of Medicine (2001)
- Years since graduation
- 25
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 278
Licensed in Illinois since 2007, according to the Illinois Department of Financial and Professional Regulation. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 2001Medical school: Tufts University School of Medicine
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Gastroenterology Physician primary
IL license 036-117818 (first issued 2007; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Northwestern Medicine Central Dupage Hospital Winfield, IL
- Northwestern Memorial Hospital Chicago, IL
- Northwestern Lake Forest Hospital Lake Forest, IL
Medical groups
- Northwestern Medical Faculty Foundation (4,503 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 278
- Services billed
- 452
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| Established patient office or other outpatient visit, 30-39 minutes | 104 | 77 |
| Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 58 | 58 |
| Biopsy of large bowel using a flexible endoscope | 34 | 32 |
| New patient office or other outpatient visit, 45-59 minutes | 31 | 31 |
| Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 28 | 27 |
| Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 21 | 17 |
| Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 20 | 19 |
| Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 20 | 15 |
| Established patient office or other outpatient visit, 20-29 minutes | 15 | 15 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Stelara (ustekinumab) | 83 |
| Budesonide Dr (budesonide) Other prescribers in Evanston, IL | 78 |
| Mesalamine Other prescribers in Evanston, IL | 49 |
| Clenpiq (sod picosulf/mag ox/citric ac) | 47 |
| Nortriptyline Hcl Other prescribers in Evanston, IL | 47 |
| Dicyclomine Hcl Other prescribers in Evanston, IL | 42 |
| Pantoprazole Sodium Other prescribers in Evanston, IL | 29 |
| Sod Sulf-Potass Sulf-Mag Sulf (sodium, potassium,mag sulfates) Other prescribers in Evanston, IL | 25 |
| Azathioprine Other prescribers in Evanston, IL | 25 |
| Cholestyramine (cholestyramine (with sugar)) Other prescribers in Evanston, IL | 25 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 7 companies reported 79 payments worth $59,840 in total to this clinician.
| Janssen Biotech, Inc. | $54,072 |
|---|---|
| Celltrion USA Inc. | $4,675 |
| AbbVie Inc. | $894 |
| Lilly USA, LLC | $158 |
| Takeda Pharmaceuticals U.S.A., Inc. | $17.66 |
| Janssen Scientific Affairs, LLC | $13.13 |
| Janssen Pharmaceuticals, Inc | $10.48 |
| Compensation for services other than consulting (speaking, faculty) | $48,059 |
|---|---|
| Consulting Fee | $5,225 |
| Travel and Lodging | $4,070 |
| Food and Beverage | $2,477 |
| Education | $10.48 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Janssen Biotech, Inc. May 17, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $7,700 |
| Janssen Biotech, Inc. Jul 24, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA; SIMPONI ARIA · Immunology | $5,075 |
| Janssen Biotech, Inc. Oct 18, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Oct 11, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Oct 18, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Mar 8, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,865 |
| Janssen Biotech, Inc. Mar 8, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,865 |
| Janssen Biotech, Inc. Mar 22, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $3,150 |
| Janssen Biotech, Inc. May 24, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $3,150 |
| Celltrion USA Inc. Apr 17, 2025 | Consulting Fee ZYMFENTRA · GASTROENTEROLOGY | $2,993 |
All 37 payments other than meals, newest first
| Company | What it was for | Amount |
|---|---|---|
| Janssen Biotech, Inc. Nov 20, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA; SIMPONI ARIA · Immunology | $1,400 |
| Janssen Biotech, Inc. Nov 6, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA; SIMPONI ARIA · Immunology | $1,400 |
| Celltrion USA Inc. Oct 30, 2025 | Consulting Fee ZYMFENTRA · GASTROENTEROLOGY | $1,532 |
| Janssen Biotech, Inc. Oct 18, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Oct 18, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Oct 13, 2025 | Travel and Lodging TREMFYA · Immunology · travel to IOWA CITY, IA | $332 |
| Janssen Biotech, Inc. Oct 13, 2025 | Travel and Lodging TREMFYA · Immunology · travel to CLEVELAND, OH | $32.20 |
| Janssen Biotech, Inc. Oct 13, 2025 | Travel and Lodging TREMFYA · Immunology · travel to CLEVELAND, OH | $30.00 |
| Janssen Biotech, Inc. Oct 11, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,900 |
| Janssen Biotech, Inc. Oct 11, 2025 | Travel and Lodging TREMFYA · Immunology · travel to CLEVELAND, OH · in-kind | $362 |
| Janssen Biotech, Inc. Oct 11, 2025 | Travel and Lodging TREMFYA · Immunology · travel to CLEVELAND, OH · in-kind | $251 |
| Janssen Biotech, Inc. Oct 11, 2025 | Travel and Lodging TREMFYA · Immunology · travel to CLEVELAND, OH · in-kind | $234 |
| Janssen Biotech, Inc. Oct 8, 2025 | Travel and Lodging TREMFYA · Immunology · travel to IOWA CITY, IA · in-kind | $234 |
| Janssen Biotech, Inc. Sep 26, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $284 |
| Janssen Biotech, Inc. Jul 24, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA; SIMPONI ARIA · Immunology | $5,075 |
| Janssen Biotech, Inc. Jul 24, 2025 | Travel and Lodging TREMFYA; SIMPONI ARIA · Immunology · travel to DETROIT, MI | $60.00 |
| Janssen Biotech, Inc. Jul 24, 2025 | Travel and Lodging TREMFYA; SIMPONI ARIA · Immunology · travel to DETROIT, MI | $21.00 |
| Janssen Biotech, Inc. Jul 19, 2025 | Compensation for services other than consulting (speaking, faculty) STELARA; TREMFYA · Immunology | $875 |
| Janssen Biotech, Inc. Jun 6, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $70.00 |
| Janssen Biotech, Inc. May 30, 2025 | Travel and Lodging TREMFYA; SIMPONI ARIA · Immunology · travel to DETROIT, MI · in-kind | $258 |
| Janssen Biotech, Inc. May 30, 2025 | Travel and Lodging TREMFYA; SIMPONI ARIA · Immunology · travel to DETROIT, MI · in-kind | $238 |
| Janssen Biotech, Inc. May 24, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $3,150 |
| Janssen Biotech, Inc. May 17, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $7,700 |
| AbbVie Inc. May 14, 2025 | Consulting Fee SKYRIZI · IMMUNOLOGY | $700 |
| Janssen Biotech, Inc. May 3, 2025 | Compensation for services other than consulting (speaking, faculty) STELARA; TREMFYA · Immunology | $525 |
| Celltrion USA Inc. Apr 17, 2025 | Consulting Fee ZYMFENTRA · GASTROENTEROLOGY | $2,993 |
| Celltrion USA Inc. Apr 17, 2025 | Travel and Lodging ZYMFENTRA · GASTROENTEROLOGY · travel to OAK BROOK, IL · in-kind | $151 |
| Janssen Biotech, Inc. Apr 10, 2025 | Travel and Lodging TREMFYA · Immunology · travel to DENVER, CO · in-kind | $335 |
| Janssen Biotech, Inc. Apr 10, 2025 | Travel and Lodging TREMFYA · Immunology · travel to DENVER, CO · in-kind | $289 |
| Janssen Pharmaceuticals, Inc Apr 7, 2025 | Education in-kind | $10.48 |
| Janssen Biotech, Inc. Mar 22, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $3,150 |
| Janssen Biotech, Inc. Mar 20, 2025 | Travel and Lodging TREMFYA · Immunology · travel to BROOKFIELD, WI | $144 |
| Janssen Biotech, Inc. Mar 20, 2025 | Travel and Lodging TREMFYA · Immunology · travel to NORTH AURORA, IL | $95.20 |
| Janssen Biotech, Inc. Mar 8, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,865 |
| Janssen Biotech, Inc. Mar 8, 2025 | Compensation for services other than consulting (speaking, faculty) TREMFYA · Immunology | $4,865 |
| Janssen Biotech, Inc. Mar 4, 2025 | Travel and Lodging TREMFYA · Immunology · travel to SUAMICO, WI · in-kind | $740 |
| Janssen Biotech, Inc. Mar 4, 2025 | Travel and Lodging TREMFYA · Immunology · travel to SUAMICO, WI · in-kind | $264 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.