EUGENE F. YEN MD
NPI 1508944018
Internal Medicine - Gastroenterology in Evanston, IL

Q: What is Eugene Yen's NPI number?

The NPI number for Eugene Yen is 1508944018. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Q: What is Eugene Yen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Q: When was this NPI record last updated?

The NPPES record for Eugene Yen was last updated on February 1, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since November 01, 2006PECOS EnrolledAccepts Medicare Assignment

94.1/100

CMS Quality Rating

2650 RIDGE AVE, SUITE G221, EVANSTON, IL 60201(847) 657-1900(847) 733-5041 Get Directions Write a Review

NPPES record last updated: February 1, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

On this page

About Eugene F. Yen Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

EUGENE F. YEN MD (NPI 1508944018) is an individual gastroenterology provider in Evanston, Illinois, licensed in Illinois (036-117818) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS, is affiliated with Northwestern Lake Forest Hospital, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1508944018

Entity TypeIndividualMale

Primary Taxonomy207RG0100X

Provider Legal NameEUGENE F. YENCredential: MD

Location Address2650 RIDGE AVE, SUITE G221Evanston, IL 60201-1718

Mailing Address2650 Ridge Ave, Suite G221Evanston, IL 60201-1718 · (847) 657-1900 · Fax (847) 733-5041

Phone(847) 657-1900

Fax(847) 733-5041

Sole ProprietorNo

Medical School CMSTufts University School Of MedicineGraduated 2001

Enumeration DateNovember 1, 2006

Last NPPES UpdateFebruary 1, 2024

NPPES CertifiedFebruary 1, 2024

✔ NPI 1508944018 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code207RG0100X

License✔ Licensed in IL · 036-117818

Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

2650 RIDGE AVE, Evanston, IL 60201

Open in Google Maps ↗

Secondary Practice Location 1

Location 1259 E Erie St Ste 1600Chicago, IL 60611-3111 · Phone (312) 695-5620 · Fax (312) 695-2310

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Eugene F. Yen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID244337079

PECOS Enrollment IDI20070514000049

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Eugene Yen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Endeavor Health Medical Group

Same address

Anesthesiology

2650 RIDGE AVE, ANESTHESIOLOGY ROOM 3905
Evanston, IL 60201

Reassigned Medicare billing, Illinois enrollment
4,841 clinicians in this Medicare group

NPI 1265695944 (847) 570-2760

Northwestern Medical Faculty Foundation

29 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 13

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

78 services62 patients

Removal of polyps or growths of large bowel using an endoscope with mechanical snare 45385

This procedure involves using a thin, flexible tube called an endoscope to examine the large bowel. If any abnormal growths or polyps are found, a tool called a mechanical snare is used to remove them. This is a common method to prevent potential health issues.

55 services55 patients

Biopsy of large bowel using a flexible endoscope 45380

A biopsy of the large bowel using a flexible endoscope is a procedure where a thin, flexible tube with a camera is inserted through the rectum to examine the bowel. If abnormal tissue is found, a small sample is taken for further examination. This helps in diagnosing conditions like inflammation, polyps, or cancer.

41 services40 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

39 services31 patients

Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope 43239

This procedure involves using a thin, flexible tube with a light and camera, known as an endoscope, to examine the esophagus, stomach, and upper part of the small intestine. Small tissue samples are taken for further examination to help diagnose various conditions.

30 services28 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

27 services18 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

22 services22 patients

Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222

Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.

22 services22 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

16 services14 patients

Colorectal cancer screening; colonoscopy on individual at high risk G0105

Colorectal cancer screening, specifically a colonoscopy, is a preventive measure for those at high risk. A thin, flexible tube with a camera inspects the colon to spot any abnormal growths. This test helps detect potential issues early, enhancing the effectiveness of treatment.

15 services15 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

14 services11 patients

Limited ultrasound scan of abdomen 76705

A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.

12 services11 patients

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204

12 services12 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northwestern Lake Forest Hospital

Acute Care Hospitals · Lake Forest, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140130

Location1000 N Westmoreland RoadLake Forest, IL 60045 · Lake County

Emergency services Birthing friendly

Northwestern Medicine Central Dupage Hospital

Acute Care Hospitals · Winfield, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140242

Location25 North Winfield RoadWinfield, IL 60190 · Du Page County

Emergency services Birthing friendly

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140281

Location251 E Huron StChicago, IL 60611 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60201 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.1/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored through an Alternative Payment Model

Quality

82.59

Promoting Interoperability

100

Improvement Activities

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. THOMAS LEE CIBULL M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

2650 RIDGE AVE, EVANSTON HOSPITAL
EVANSTON, IL 60201

Cook County (847) 570-2040

LAUREN ANDERSON MD

Hospitalist

2650 RIDGE AVE
EVANSTON, IL 60201

Cook County (847) 570-1027

DR. DANIEL K. WEST MD

Radiology (Diagnostic Radiology)

2650 RIDGE AVE, DEPARTMENT OF RADIOLOGY, G507
EVANSTON, IL 60201

Cook County (847) 570-2475

JOEL BERNSTEIN M.D.

Radiology (Diagnostic Radiology)

2650 RIDGE AVE, EVANSTON HOSPITAL
EVANSTON, IL 60201

Cook County (847) 570-1206

MATTHEW R. SHERWOOD MD

Internal Medicine

2650 RIDGE AVE, DIVISION OF INTERNAL MEDICINE RM 4324
EVANSTON, IL 60201

Cook County (847) 570-1010

MICHAEL T. GILLAM M.D.

Emergency Medicine

2650 RIDGE AVE, EMERGENCY MEDICINE RM G909
EVANSTON, IL 60201

Cook County (847) 570-2114

MARLENE ANGELICO CNP

Nurse Practitioner (Acute Care)

2650 RIDGE AVE, EMERGENCY MEDICINE, RM G903C
EVANSTON, IL 60201

Cook County (847) 570-1355

MINA KEROLOS MD

Hospitalist

2650 RIDGE AVE
EVANSTON, IL 60201

Cook County (847) 570-1010

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Eugene Yen's NPI number?

The NPI number for Eugene Yen is 1508944018. It was assigned to this individual provider in the NPPES registry on November 1, 2006.

Where is Eugene Yen located?

Eugene Yen practices at 2650 Ridge Ave Suite G221, Evanston, IL 60201. The listed phone number is (847) 657-1900.

What is Eugene Yen's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Eugene Yen enrolled in Medicare?

Yes. Eugene Yen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Eugene Yen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Eugene Yen reassigns Medicare benefits to 2 organizations: Endeavor Health Medical Group (Evanston, IL) and Northwestern Medical Faculty Foundation (Carol Stream, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Eugene Yen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Eugene Yen affiliated with any hospitals?

According to CMS data, Eugene Yen is affiliated with Northwestern Lake Forest Hospital, Northwestern Medicine Central Dupage Hospital and Northwestern Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Eugene Yen was last updated on February 1, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.