DR. EUGENE YOUNG LEE MD
NPI 1023049590
Specialist in San Mateo, CA

Q: What is Eugene Lee's NPI number?

The NPI number for Eugene Lee is 1023049590. It was assigned to this individual provider in the NPPES registry on July 5, 2006.

Q: What is Eugene Lee's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Q: When was this NPI record last updated?

The NPPES record for Eugene Lee was last updated on February 21, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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 July 05, 2006PECOS EnrolledAccepts Medicare Assignment

90.89/100

CMS Quality Rating

100 SOUTH ELLSWORTH AVENUE, SUITE 507, SAN MATEO, CA 94401(650) 342-7432(650) 342-3239 Get Directions Write a Review

NPPES record last updated: February 21, 2008. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About Dr. Eugene Young Lee Md NPPES

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

DR. EUGENE YOUNG LEE MD (NPI 1023049590) is an individual specialist in San Mateo, California, licensed in California (A87261) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS and is a graduate of New York University School Of Medicine (1998).

NPPES Registry Identity

NPI1023049590

Entity TypeIndividualMale

Primary Taxonomy174400000X

Provider Legal NameDR. EUGENE YOUNG LEECredential: MD

Location Address100 SOUTH ELLSWORTH AVENUE, SUITE 507San Mateo, CA 94401-2708

Mailing Address100 S Ellsworth Ave Ste 507San Mateo, CA 94401-3929 · (650) 342-7432 · Fax (650) 342-3239

Phone(650) 342-7432

Fax(650) 342-3239

Sole ProprietorNo

Medical School CMSNew York University School Of MedicineGraduated 1998

Enumeration DateJuly 5, 2006

Last NPPES UpdateFebruary 21, 2008

✔ NPI 1023049590 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers

Taxonomy Code174400000X

License✔ Licensed in CA · A87261

Definition

An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

100 SOUTH ELLSWORTH AVENUE, San Mateo, CA 94401

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Other Identifiers 1

Medicare ID-Type Unspecified00A872615CA

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

Dr. Eugene Young Lee 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 ID2163402603

PECOS Enrollment IDI20040723000882

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 Reassignment

Medicare enrollment records show Eugene Lee reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Peninsula Gastrointestinal

0.2 mi

Gastroenterology

100 S ELLSWORTH AVE, SUITE 507
San Mateo, CA 94401

Reassigned Medicare billing, California enrollment
3 clinicians in this Medicare group

NPI 1306144209 (650) 342-7432

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 12

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.

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.

117 services117 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.

98 services98 patients

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.

98 services90 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.

85 services85 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.

69 services45 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.

66 services66 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

51 services50 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

50 services50 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.

35 services35 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

27 services25 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.

21 services21 patients

Telephone medical discussion with physician, 11-20 minutes 99442

This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.

20 services19 patients

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.

90.89/100

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

Scored as part of a group practice

Quality

100

Promoting Interoperability

100

Improvement Activities

Cost

69.65

Other Providers at the Same Location NPPES 3

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

ONUMA AND LEE MD'S

Internal Medicine (Gastroenterology)

100 SOUTH ELLSWORTH AVENUE, SUITE 507
SAN MATEO, CA 94401

San Mateo County (650) 342-7432

DR. EDWARD K ONUMA M.D.,PHD

Specialist

100 SOUTH ELLSWORTH AVENUE, SUITE 507
SAN MATEO, CA 94401

San Mateo County (650) 342-7432

PAUL E HUGHES MD

Orthopaedic Surgery (Sports Medicine)

100 SOUTH ELLSWORTH AVENUE, SUITE 504
SAN MATEO, CA 94401

San Mateo County (650) 343-5633

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 Lee's NPI number?

The NPI number for Eugene Lee is 1023049590. It was assigned to this individual provider in the NPPES registry on July 5, 2006.

Where is Eugene Lee located?

Eugene Lee practices at 100 South Ellsworth Avenue Suite 507, San Mateo, CA 94401. The listed phone number is (650) 342-7432.

What is Eugene Lee's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Eugene Lee enrolled in Medicare?

Yes. Eugene Lee 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 organization bills Medicare for Eugene Lee's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Eugene Lee reassigns Medicare benefits to Peninsula Gastrointestinal (San Mateo, CA). The 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 Lee's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Eugene Lee was last updated on February 21, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.