Phong Nguyen, MD
NPI 1346268778 · Family Medicine Physician · Winchester, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Phong Nguyen, MD is a Family Medicine Physician provider in Winchester, CA (NPI 1346268778).
Provider details
- NPI number
- 1346268778
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A95447 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 56 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Quetiapine Fumarate | 121 | 22 |
| Sertraline Hcl | 88 | 27 |
| Lisinopril | 82 | 27 |
| Levothyroxine Sodium | 82 | 22 |
| Gabapentin | 73 | 21 |
| Omeprazole | 53 | — |
| Atorvastatin Calcium |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$64 across 1 record (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
- 2006-07-17
- Last updated
- 2021-12-16
Frequently asked questions
- What is Phong Nguyen's NPI number?
- Phong Nguyen's National Provider Identifier (NPI) is 1346268778, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Phong Nguyen's specialty?
- Phong Nguyen is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Phong Nguyen located?
- Phong Nguyen's practice location on file with NPPES is 31895 Opal Dr, Winchester, CA 92596-9081.
- What is Phong Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Phong Nguyen is (858) 472-1800.
- Does Phong Nguyen accept Medicare?
- Phong Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Phong Nguyen's NPI active?
- Yes — Phong Nguyen's NPI (1346268778) is active in the NPPES registry as of the last update on 2021-12-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.