Phuong Nguyen, DO
NPI 1336609908 · Internal Medicine Physician · Sierra Madre, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Phuong Nguyen, DO is a Internal Medicine Physician provider in Sierra Madre, CA (NPI 1336609908).
Provider details
- NPI number
- 1336609908
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- 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 tenure25% of score
7 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
451 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 | 199 | $139 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 69 | $98 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 66 | $140 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 52 | $21 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 30 | $16 |
| Hemoglobin A1c Level83036 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 45 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 116 | 36 |
| Levothyroxine Sodium | 92 | 20 |
| Amlodipine Besylate | 65 | 18 |
| Rosuvastatin Calcium | 53 | 17 |
| Tamsulosin Hcl | 50 | — |
| Losartan Potassium | 46 | 14 |
| Metformin Hcl |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$428 across 18 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
- 2019-03-20
- Last updated
- 2023-02-02
- Certified
- 2023-02-02
Frequently asked questions
- What is Phuong Nguyen's NPI number?
- Phuong Nguyen's National Provider Identifier (NPI) is 1336609908, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Phuong Nguyen's specialty?
- Phuong Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Phuong Nguyen located?
- Phuong Nguyen's practice location on file with NPPES is 147 W Sierra Madre Blvd, Sierra Madre, CA 91024-2492.
- What is Phuong Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Phuong Nguyen is (626) 355-3443.
- Does Phuong Nguyen accept Medicare?
- Phuong Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Phuong Nguyen's NPI active?
- Yes — Phuong Nguyen's NPI (1336609908) is active in the NPPES registry as of the last update on 2023-02-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.