Dat Nguyen, M.D.
NPI 1871730895 · Internal Medicine Physician · Westminster, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Dat Nguyen, M.D. is a Internal Medicine Physician provider in Westminster, CA (NPI 1871730895).
Provider details
- NPI number
- 1871730895
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A36056 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
17 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,367 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 1,082 | $132 |
| Application of Ultrasound, Each 15 Minutes97035 | 238 | $11 |
| Therapy Procedure Using Manual Technique, Each 15 Minutes97140 | 238 | $24 |
| Application of Electrical Stimulation With Therapist Present, Each 15 Minutes97032 | 234 | $11 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 181 | $94 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 58 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 180 | 71 |
| Amlodipine Besylate | 121 | 45 |
| Losartan Potassium | 83 | 33 |
| Triamcinolone Acetonide | 71 | 44 |
| Montelukast Sodium | 67 | 37 |
| Metoprolol Succinate | 58 | 22 |
| Meloxicam | 57 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$146 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2009-01-13
- Last updated
- 2009-01-13
Frequently asked questions
- What is Dat Nguyen's NPI number?
- Dat Nguyen's National Provider Identifier (NPI) is 1871730895, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Dat Nguyen's specialty?
- Dat Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Dat Nguyen located?
- Dat Nguyen's practice location on file with NPPES is 14536 Brookhurst St, Westminster, CA 92683-5787.
- What is Dat Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Dat Nguyen is (714) 531-2548.
- Does Dat Nguyen accept Medicare?
- Dat Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Dat Nguyen's NPI active?
- Yes — Dat Nguyen's NPI (1871730895) is active in the NPPES registry as of the last update on 2009-01-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.