NPI registry status
Active
2026 NPPES data Specialist NPI 1346582335 M.D., M.P.H.
Verify on CMS → Viet Nguyen, M.D., M.P.H.
Specialist in Los Angeles, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 69,608 in Specialist, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
96
Medicare Part D claims · Specialist avg: 1K
Generic prescribing
63%
generic claims · 38% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Viet Nguyen, M.D., M.P.H. filed 96 Medicare Part D claims in 2023 as a Specialist in Los Angeles, California, prescribing 63% generic.
- 96
- Part D claims, 2023
- 63%
- generic prescribing
- ≥0th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
CMS NPPES provider registry desk
NPI 1346582335 · Specialist
NPI-10 · ENUM-MID · TAX-MEGA · RX-TRACE · BOOK-MID · PHOTO-ENUM
- NPI-10 1346582335
- ENUM-MID 2013
- TAX-MEGA 70K Specialist
- RX-TRACE 96
- BOOK-MID 6,672 in California
- PHOTO-ENUM Gary Kao · 2013
Viet Nguyen, M.D., M.P.H.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
96 ≥ 0th percentile 0% of 1,370,886 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
What does the federal data show about Viet Nguyen, M.D., M.P.H.?
Quality data not reportedPrimary specialty
Specialist
Medicare Part D claims
96 93% vs specialty avg
Specialty distribution in California
How Specialist compares to other specialties among California providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Specialist. Verify directly:
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1346582335 |
|---|---|
| Specialty | Specialist |
| Credentials | M.D., M.P.H. |
| Gender | Female |
| NPI Issued | 03/18/2013 |
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Viet Nguyen, M.D., M.P.H.. To verify Viet Nguyen, M.D., M.P.H.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Above average
Viet Nguyen, M.D., M.P.H. - brand share 38.0%
Specialist average
38% brand-name claims vs 63% generic, on 96 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
96
Total Claims
$94K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 96
- Total Day Supply
- 2,585
- Brand vs Generic
- 38% brand / 63% generic
- Brand Drug Cost
- $89K
- Generic Drug Cost
- $5K
Patient Demographics
- Average Patient Age
- 54.9 years
- Avg HCC Risk Score
- 1.32
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Invega Sustenna Paliperidone Palmitate | 15 |
| Aripiprazole | 14 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Specialist Overview
How Viet Nguyen, M.D., M.P.H. fits within the Specialist landscape nationally.
69,608
Specialist Providers in US
55
States with Specialist
1,474
Avg Claims per Provider
Viet Nguyen, M.D., M.P.H.'s 96 claims are below the specialty average of 1,474.
Nationwide Specialist peers with similar MIPS or enrollment year
Two federal-record peer sets for Nguyen, both outside California so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2013)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Specialist Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
One of 6,672 Specialist providers enrolled in California, 5 are shown here.
Adrienne Abad Santos
San Francisco, CA
Dr. Brenda Abarca
MD
Torrance, CA
Dr. Fatemeh Abbasi
PT
Van Nuys, CA
Dr. Erlinda Abcede
M.D.
Cudahy, CA
Dr. Maher Abdallah
M.D.
Palm Springs, CA
Compare Specialist nationally: see state-by-state distribution →
Frequently Asked Questions
What is Viet Nguyen, M.D., M.P.H.'s specialty? ▼
Viet Nguyen, M.D., M.P.H. specializes in Specialist and practices in Los Angeles, California. Credentials: M.D., M.P.H..
How much does Viet Nguyen, M.D., M.P.H. prescribe under Medicare Part D? ▼
In 2023, Viet Nguyen, M.D., M.P.H. wrote 96 Medicare Part D claims totaling $94K in drug costs for N/A beneficiaries.
Where is Viet Nguyen, M.D., M.P.H. located? ▼
Viet Nguyen, M.D., M.P.H. is located at 313 N FIGUEROA ST RM 132, Los Angeles, CA, 90012. Phone: (323) 768-2787.
What is Viet Nguyen, M.D., M.P.H.'s NPI number? ▼
Viet Nguyen, M.D., M.P.H.'s National Provider Identifier (NPI) is 1346582335, issued on 03/18/2013.
Does Viet Nguyen, M.D., M.P.H. prescribe more brand-name or generic drugs? ▼
Viet Nguyen, M.D., M.P.H.'s prescribing is 38% brand-name and 63% generic drugs by claim count, with $89K in brand drug costs.
How many Specialist providers are there in the US? ▼
There are 69,608 Specialist providers across 55 states in the US. The average Specialist provider writes 1,474 Medicare Part D claims per year.
What drugs does Viet Nguyen, M.D., M.P.H. prescribe most often? ▼
Based on 2023 Medicare Part D data, Viet Nguyen, M.D., M.P.H.'s most frequently prescribed drugs include Invega Sustenna, Aripiprazole. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Viet Nguyen, M.D., M.P.H. accept Medicare? ▼
Viet Nguyen, M.D., M.P.H. appears in CMS Medicare data with 96 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Viet Nguyen, M.D., M.P.H.'s credentials? ▼
Viet Nguyen, M.D., M.P.H.'s NPI is 1346582335 with credentials M.D., M.P.H.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.