TIEN T NGUYEN M.D. INC.
NPI 1063534204
Neurological Surgery in Fountain Valley, CA

Active since April 06, 2007
11190 WARNER AVE, SUITE 305, FOUNTAIN VALLEY, CA 92708(714) 433-2000(714) 433-2901 Get Directions Write a Review

NPPES record last updated: January 28, 2013. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Tien T Nguyen M.d. Inc. NPPES

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

TIEN T NGUYEN M.D. INC. (NPI 1063534204) is a healthcare organization registered as a neurological surgery in Fountain Valley, California and active in the NPI registry since April 2007. The organization lists Tien T Nguyen, President, as its authorized official.

NPPES Registry Identity

NPI1063534204
Entity TypeOrganization
Primary Taxonomy207T00000X
Legal Business NameTIEN T NGUYEN M.D. INC.
Location Address11190 WARNER AVE, SUITE 305Fountain Valley, CA 92708-4019
Mailing Address11190 Warner Ave, Suite 305Fountain Valley, CA 92708-4019 · (714) 433-2000 · Fax (714) 433-2901
Fax(714) 433-2901
Organization SubpartNo
Authorized OfficialTien T NguyenPresident · (714) 433-2000
Enumeration DateApril 6, 2007
Last NPPES UpdateJanuary 28, 2013
✔ NPI 1063534204 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNeurological SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code207T00000X
License✔ Licensed in CA · G81962
Definition
A neurological surgeon provides the operative and non-operative management (i.e., prevention, diagnosis, evaluation, treatment, critical care, and rehabilitation) of disorders of the central, peripheral, and autonomic nervous systems, including their supporting structures and vascular supply; the evaluation and treatment of pathological processes which modify function or activity of the nervous system; and the operative and non-operative management of pain. A neurological surgeon treats patients with disorders of the nervous system; disorders of the brain, meninges, skull, and their blood supply, including the extracranial carotid and vertebral arteries; disorders of the pituitary gland; disorders of the spinal cord, meninges, and vertebral column, including those which may require treatment by spinal fusion or instrumentation; and disorders of the cranial and spinal nerves throughout their distribution.
11190 WARNER AVE, Fountain Valley, CA 92708

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)

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

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to Tien T Nguyen M.D. Inc., which bills Medicare for the services they deliver. Of these, 2 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Neurosurgery
NPI 1881838662
11190 WARNER AVE SUITE 305
Fountain Valley, CA 92708
(714) 433-2000
✔ PECOS✔ Accepts Medicare0.2 mi
Neurosurgery
NPI 1356385025
11190 WARNER AVE SUITE 305
Fountain Valley, CA 92708
(714) 433-2000
✔ PECOS✔ Accepts Medicare0.2 mi

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

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 Tien T Nguyen M.D. Inc.'s NPI number?

The NPI number for Tien T Nguyen M.D. Inc. is 1063534204. It was assigned to this organization in the NPPES registry on April 6, 2007.

Where is Tien T Nguyen M.D. Inc. located?

Tien T Nguyen M.D. Inc. is located at 11190 Warner Ave Suite 305, Fountain Valley, CA 92708. The listed phone number is (714) 433-2000.

What is Tien T Nguyen M.D. Inc.'s specialty?

The primary specialty registered for this NPI is Neurological Surgery with taxonomy code 207T00000X.

Is Tien T Nguyen M.D. Inc. enrolled in Medicare?

Yes. Tien T Nguyen M.D. Inc. is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Tien T Nguyen M.D. Inc.?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Neurosurgery, reassign their Medicare billing to Tien T 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. Of these, 2 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Tien T Nguyen M.D. Inc. was last updated on January 28, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.