Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Tien Trong Nguyen, MD

Individual provider Orthopaedic Surgery Physician · NPI 1356385025

Tien Trong Nguyen, MD practises Neurosurgery in Fountain Valley, California. Graduated from New York Medical College in 1993, 33 years ago. Practices with Tien T Nguyen MD Inc, a 6-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
33
Trained at
New York Medical College
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

11190 Warner Ave Ste 305
Fountain Valley, CA 92708-4019 Not confirmed with CMS for 13 years — call before visiting
Phone: (714) 433-2000
Fax: (714) 433-2901
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence G81962 (CA)
Orthopaedic Surgery Physician Taxonomy 207X00000X · Licence G81962 (CA)

Record details

NPI number1356385025
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 15, 2006
Last updated in NPPESFebruary 28, 2013

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEUROSURGERY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1993 (33 years in practice)
Group practice Tien T Nguyen M.D. Inc. — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Spinal fusion 225 times · 92nd percentile
Laminectomy or laminotomy (partial removal of spine bones) 37 times · 67th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients497
Services billed 1,356 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Royalty or License $27,409 13 payments · paid for the use of something the clinician owns or invented, such as a patent; not a fee for care or for time
Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $15,378 9 payments
Consulting Fee $4,725 1 payment
Travel and Lodging $1,475 7 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $1,333 16 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Tien T Nguyen MD Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 6 clinicians in the practice; 3 are shown here.

Other providers in Fountain Valley