WON K YU, MD, MPH DIGESTIVE DISEASES
NPI 1538334289
Internal Medicine - Gastroenterology in Tustin, CA

Q: What is Won K Yu MD Mph Inc's NPI number?

The NPI number for Won K Yu MD Mph Inc is 1538334289. It was assigned to this organization in the NPPES registry on April 24, 2008. The provider is doing business as Won K Yu, MD, Mph Digestive Diseases.

Q: What is Won K Yu MD Mph Inc's specialty?

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

Active since April 24, 2008CLIA 05D2168636 · Certificate of Compliance

17400 IRVINE BLVD STE F, TUSTIN, CA 92780(714) 937-9400(714) 937-9404 Get Directions Write a Review

NPPES record last updated: August 4, 2023. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Won K Yu, Md, Mph Digestive Diseases NPPES

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

WON K YU, MD, MPH DIGESTIVE DISEASES (NPI 1538334289) is a healthcare organization registered as a gastroenterology in Tustin, California and active in the NPI registry since April 2008. The organization holds a CLIA Certificate of Compliance certificate valid through January 27, 2027 and lists Won Kye Yu, Owner, as its authorized official.

NPPES Registry Identity

NPI1538334289

Entity TypeOrganization

Primary Taxonomy207RG0100X

Legal Business NameWON K YU MD MPH INC

Location Address17400 IRVINE BLVD STE FTustin, CA 92780-3030

Mailing Address230 S Main St, Ste 215Orange, CA 92868-3851 · (714) 937-9400 · Fax (714) 937-9404

Phone(714) 937-9400

Fax(714) 937-9404

Organization SubpartNo

Authorized OfficialWon Kye YuOwner · (714) 937-9400

Enumeration DateApril 24, 2008

Last NPPES UpdateAugust 4, 2023

NPPES CertifiedAugust 4, 2023

✔ NPI 1538334289 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 CA · A77275

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.

17400 IRVINE BLVD STE F, Tustin, CA 92780

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Other Names 1

Doing Business AsWon K Yu, Md, Mph Digestive Diseases

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Won K Yu, Md, Mph Digestive Diseases is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Won K Yu, MD, Mph Digestive Diseases, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 2 within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Won Yu, M.D.

Gastroenterology

NPI 1720065303

17400 IRVINE BLVD STE F
Tustin, CA 92780

(714) 937-9400

✔ PECOS✔ Accepts MedicareSame address

Cindy An, AGPCNP-BC

Nurse Practitioner

NPI 1801579420

100 N STATE COLLEGE BLVD STE H
Fullerton, CA 92831

(714) 824-6565

✔ PECOS✔ Accepts Medicare9.2 mi

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

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Compliance 05D2168636

Won K Yu MD Inc · Tustin, CA

Active · expires Jan 27, 2027

CLIA Number05D2168636

Laboratory TypePhysician Office

Certificate Effective DateJanuary 28, 2025

Certificate Expiration DateJanuary 27, 2027

Laboratory DirectorDr. Richeh Rana MD

Laboratory Phone(714) 937-9400

Laboratory LocationWon K Yu MD Inc17400 Irvine Blvd, Ste F, Tustin, CA 92780

CLIA data matches this NPI record on: Address Name Phone

This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

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 Won K Yu MD Mph Inc's NPI number?

The NPI number for Won K Yu MD Mph Inc is 1538334289. It was assigned to this organization in the NPPES registry on April 24, 2008. The provider is doing business as Won K Yu, MD, Mph Digestive Diseases.

Where is Won K Yu MD Mph Inc located?

Won K Yu MD Mph Inc is located at 17400 Irvine Blvd Ste F, Tustin, CA 92780. The listed phone number is (714) 937-9400.

What is Won K Yu MD Mph Inc's specialty?

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

Is Won K Yu MD Mph Inc enrolled in Medicare?

Yes. Won K Yu MD Mph Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Won K Yu MD Mph Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians reassign their Medicare billing to Won K Yu MD Mph Inc, in Gastroenterology and Nurse Practitioner. A 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 the clinician's services. Of these, 1 practice at this address and 2 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Won K Yu MD Mph Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Compliance (number 05D2168636) is associated with this NPI, valid through January 27, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Won K Yu MD Mph Inc was last updated on August 4, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.