Alexander Nguyen, M.D., M.P.H.
NPI 1821330069 · Psychiatry Physician · Torrance, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Alexander Nguyen, M.D., M.P.H. is a Psychiatry Physician provider in Torrance, CA (NPI 1821330069).
Provider details
- NPI number
- 1821330069
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.P.H.
- Sex
- Male
- Sole proprietor
- No
- License
- A143656 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
115 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) |
|---|---|---|
| Subsequent Nursing Facility Care With Straightforward Level of Medical Decision Making, Per Day, If Using Time, at Least 10 Minutes99307 | 115 | $43 |
Typical Medicare-allowed amounts for these services range $43–$43 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Olanzapine | 95 |
| Paliperidone Palmitatebrand: Invega Sustenna | 66 |
| Buspirone Hcl | 51 |
| Haloperidol Decanoate | 48 |
| Benztropine Mesylate | 38 |
| Clozapine | 36 |
| Haloperidol | 30 |
| Divalproex Sodiumbrand: Divalproex Sodium Er | 21 |
| Divalproex Sodium | 20 |
| Quetiapine Fumarate | 19 |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-03-26
- Last updated
- 2018-07-13
Frequently asked questions
- What is Alexander Nguyen's NPI number?
- Alexander Nguyen's National Provider Identifier (NPI) is 1821330069, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Alexander Nguyen's specialty?
- Alexander Nguyen is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Alexander Nguyen located?
- Alexander Nguyen's practice location on file with NPPES is 1000 W Carson St # 8, Torrance, CA 90502.
- What is Alexander Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Alexander Nguyen is (310) 222-3137.
- Does Alexander Nguyen accept Medicare?
- Alexander Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Alexander Nguyen's NPI active?
- Yes — Alexander Nguyen's NPI (1821330069) is active in the NPPES registry as of the last update on 2018-07-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.