Stanley Nguyen
NPI 1164954145 · Internal Medicine Physician · Fountain Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stanley Nguyen is a Internal Medicine Physician provider in Fountain Valley, CA (NPI 1164954145).
Provider details
- NPI number
- 1164954145
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 yrs in NPPES registry
- Profile completeness28% of score
83% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
236 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 145 | $135 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 61 | $179 |
| Initial Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 40 Minutes99221 | 30 | $85 |
Typical Medicare-allowed amounts for these services range $85–$179 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-03-30
- Last updated
- 2021-08-16
- Certified
- 2021-08-16
Frequently asked questions
- What is Stanley Nguyen's NPI number?
- Stanley Nguyen's National Provider Identifier (NPI) is 1164954145, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stanley Nguyen's specialty?
- Stanley Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stanley Nguyen located?
- Stanley Nguyen's practice location on file with NPPES is 17360 Brookhurst St, Fountain Valley, CA 92708-3720.
- What is Stanley Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Stanley Nguyen is (949) 340-9530.
- Does Stanley Nguyen accept Medicare?
- Stanley Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stanley Nguyen's NPI active?
- Yes — Stanley Nguyen's NPI (1164954145) is active in the NPPES registry as of the last update on 2021-08-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.