Quick answers
- Does Tien T. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Tien T. Nguyen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Tien T. Nguyen see?
- In 2024, CMS data shows 497 Original Medicare patients and 1,356 services for Tien T. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Tien T. Nguyen's NPI number?
- 1356385025. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Tien T. Nguyen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 497 |
|---|---|
| Services billed to Medicare | 1,356 |
| Different services or procedures | 60 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)440 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)221 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)195 services
- Critical care, first 30-74 minutes (99291)186 services
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes (99233)51 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis75%
- Diabetes54%
- Chronic kidney disease43%
- Ischemic heart disease41%
Hospitals where Tien T. Nguyen works
Medicare's Facility Affiliation Data lists Tien T. Nguyen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Memorialcare Orange Coast Medical CenterFountain Valley, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050678
- Orange County Global Medical CenterSanta Ana, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050746
- UCI Health-OrangeOrange, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050348
Practice locations
Addresses where Tien T. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 18035 Brookhurst St, Suite 1700Fountain Valley, CA 92708 (714) 433‑2000
Group practices
Medicare enrollment lists Tien T. Nguyen as a member of this group (CMS data updated October 2, 2026).
- Tien T Nguyen M.D. Inc.6 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Tien T Nguyen M.D. Inc.
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | New York Medical College |
| Graduation year | 1993 (33 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1356385025 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians