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MR. WILLIAM TAN NGUYEN M.D.
NPI 1043424575
Internal Medicine in Orange, CA

Active since May 10, 2007PECOS EnrolledAccepts Medicare Assignment
101 THE CITY DR S BLDG 200, SUITE 720 RT. 1, ORANGE, CA 92868(408) 826-2362 Get Directions Write a Review

NPPES record last updated: November 4, 2021. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mr. William Tan Nguyen M.d. NPPES

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

MR. WILLIAM TAN NGUYEN M.D. (NPI 1043424575) is an individual internal medicine provider in Orange, California, licensed in California (A98370) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2005).

NPPES Registry Identity

NPI1043424575
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMR. WILLIAM TAN NGUYENCredential: M.D.
Location Address101 THE CITY DR S BLDG 200, SUITE 720 RT. 1Orange, CA 92868-3201
Mailing Address3460 East La Palma AvenueAnaheim, CA 92806 · (714) 644-2000
Phone(408) 826-2362
Sole ProprietorYes
Medical School CMSOtherGraduated 2005
Enumeration DateMay 10, 2007
Last NPPES UpdateNovember 4, 2021
NPPES CertifiedNovember 4, 2021
✔ NPI 1043424575 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A98370
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
101 THE CITY DR S BLDG 200, Orange, CA 92868
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mr. William Tan Nguyen M.d. 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 ID9133290653
PECOS Enrollment IDI20160407001623
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92868 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

Other Providers at the Same Location NPPES

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

KENNETH KIM M.D
Emergency Medicine
101 THE CITY DR S BLDG 200
ORANGE, CA 92868
Orange County (714) 456-5922

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 William Nguyen's NPI number?

The NPI number for William Nguyen is 1043424575. It was assigned to this individual provider in the NPPES registry on May 10, 2007.

Where is William Nguyen located?

William Nguyen practices at 101 The City Dr S Bldg 200 Suite 720 Rt. 1, Orange, CA 92868. The listed phone number is (408) 826-2362.

What is William Nguyen's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is William Nguyen enrolled in Medicare?

Yes. William Nguyen 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.

When was this NPI record last updated?

The NPPES record for William Nguyen was last updated on November 4, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.