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TUAN NGUYEN, M.D., INC
NPI 1154569986
Internal Medicine - Gastroenterology in San Diego, CA

Active since February 02, 2009CLIA 05D0951169 · Waiver
4141 FAIRMOUNT AVE, SUITE #201, SAN DIEGO, CA 92105(619) 563-4040(619) 563-1204 Get Directions Write a Review

NPPES record last updated: February 2, 2009. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Tuan Nguyen, M.d., Inc NPPES

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

TUAN NGUYEN, M.D., INC (NPI 1154569986) is a healthcare organization registered as a gastroenterology in San Diego, California and active in the NPI registry since February 2009. The organization holds a CLIA Waiver certificate valid through October 19, 2028 and lists Tuan Nguyen, President, as its authorized official.

NPPES Registry Identity

NPI1154569986
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameTUAN NGUYEN, M.D., INC
Location Address4141 FAIRMOUNT AVE, SUITE #201San Diego, CA 92105-1609
Mailing AddressPo Box 420988San Diego, CA 92142-0988 · (619) 563-4040 · Fax (619) 563-1204
Phone(619) 563-4040
Fax(619) 563-1204
Organization SubpartNo
Authorized OfficialTuan NguyenPresident · (619) 563-4040
Enumeration DateFebruary 2, 2009
✔ NPI 1154569986 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 · G68761
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.
4141 FAIRMOUNT AVE, San Diego, CA 92105
Open in Google Maps ↗

Other Identifiers 1

Medicare PING68761CA

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)

Tuan Nguyen, M.d., Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Tuan Nguyen, M.D., Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Tuan Nguyen, MD
Internal Medicine
NPI 1730270380
4141 FAIRMOUNT AVE SUITE #201
San Diego, CA 92105
(858) 278-5293
✔ PECOS✔ Accepts MedicareSame address

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 Waiver 05D0951169

Tuan T Nguyen MD, Inc · San Diego, CA
Active · expires Oct 19, 2028
CLIA Number05D0951169
Laboratory TypePhysician Office
Certificate Effective DateOctober 20, 2026
Certificate Expiration DateOctober 19, 2028
Laboratory DirectorTuan T. Nguyen MD
Laboratory Phone(619) 563-4040
Laboratory LocationTuan T Nguyen MD, Inc4141 Fairmount Avenue #201, San Diego, CA 92105
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

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 Tuan Nguyen, M.D., Inc's NPI number?

The NPI number for Tuan Nguyen, M.D., Inc is 1154569986. It was assigned to this organization in the NPPES registry on February 2, 2009.

Where is Tuan Nguyen, M.D., Inc located?

Tuan Nguyen, M.D., Inc is located at 4141 Fairmount Ave Suite #201, San Diego, CA 92105. The listed phone number is (619) 563-4040.

What is Tuan Nguyen, M.D., Inc's specialty?

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

Is Tuan Nguyen, M.D., Inc enrolled in Medicare?

Yes. Tuan Nguyen, M.D., Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Tuan Nguyen, M.D., Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Tuan Nguyen, M.D., Inc. 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. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Tuan Nguyen, M.D., Inc hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 05D0951169) is associated with this NPI, valid through October 19, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

When was this NPI record last updated?

The NPPES record for Tuan Nguyen, M.D., Inc was last updated on February 2, 2009. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.