Doan Nguyen, MD
NPI 1336503838 · Psychiatry Physician · Westminster, CA
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Doan Nguyen, MD is a Psychiatry Physician provider in Westminster, CA (NPI 1336503838).
Provider details
- NPI number
- 1336503838
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A153320 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
10 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
21 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) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 21 | $176 |
Typical Medicare-allowed amounts for these services range $176–$176 (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 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Risperidone | 70 | — |
| Divalproex Sodium | 65 | — |
| Olanzapine | 64 | 13 |
| Duloxetine Hcl | 54 | — |
| Trazodone Hcl | 50 | 13 |
| Escitalopram Oxalate | 46 | — |
| Lamotrigine | 28 | — |
| Aripiprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-04-11
- Last updated
- 2020-07-28
- Certified
- 2020-07-28
Frequently asked questions
- What is Doan Nguyen's NPI number?
- Doan Nguyen's National Provider Identifier (NPI) is 1336503838, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Doan Nguyen's specialty?
- Doan Nguyen is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Doan Nguyen located?
- Doan Nguyen's practice location on file with NPPES is 14140 Beach Blvd Ste 223, Westminster, CA 92683-4453.
- What is Doan Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Doan Nguyen is (714) 896-7566.
- Does Doan Nguyen accept Medicare?
- Doan Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Doan Nguyen's NPI active?
- Yes — Doan Nguyen's NPI (1336503838) is active in the NPPES registry as of the last update on 2020-07-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.