NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1952842221
Verify on CMS → Stefan Nguyen
Hospitalist Physician 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 16,938 in Hospitalist Physician, 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
427
Medicare Part D claims · 208 beneficiaries · Hospitalist Physician avg: 888
Industry payments
$138.58
1 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Stefan Nguyen filed 427 Medicare Part D claims in 2023 as a Hospitalist Physician in Los Angeles, California.
- 427
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Stefan Nguyen's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
427 Top 38% higher than 62% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Stefan Nguyen practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Stefan Nguyen?
Quality data not reportedPrimary specialty
Hospitalist Physician
Medicare Part D claims
427 52% vs specialty avg
Specialty distribution in California
How Hospitalist Physician 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 Hospitalist Physician. 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).
Stefan Nguyen appears in the CMS NPPES registry as a Hospitalist Physician provider at 1500 SAN PABLO ST, Los Angeles, CA, 90033, with a listed phone of (323) 442-5100. NPI 1952842221 was issued on 03/20/2017.
Medicare Part D records for calendar year 2023 show 427 prescription claims written by this provider, covering 208 Medicare beneficiaries and totaling roughly $25K in drug spend, with an opioid prescribing rate of 9.6%.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,938 enrolled providers across 54 states and an average of 888 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1952842221 |
|---|---|
| Specialty | Hospitalist Physician |
| Gender | Male |
| NPI Issued | 03/20/2017 |
Hospital and facility affiliations
Facilities where Stefan Nguyen bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Southern California Permanente Medical Group
Downey, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Stefan Nguyen. Source: openpaymentsdata.cms.gov.
Total received
$139
Largest payer
Edwards Lifesciences Corporation
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
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 Stefan Nguyen. To verify Stefan Nguyen'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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
427
Total Claims
$25K
Total Drug Cost
208
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 465
- Total Day Supply
- 8,482
- Generic Drug Cost
- $12K
- Opioid Claims
- 41 (9.6% rate)
- Antibiotic Claims
- 114
Patient Demographics
- Average Patient Age
- 77.0 years
- Avg HCC Risk Score
- 2.11
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 17, 65-74: 60, 75-84: 85, 85+: 46
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Stefan Nguyen prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cefuroxime
Cefuroxime
28 claims
- Ondansetron Odt
Ondansetron Odt
24 claims
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
23 claims
- Atorvastatin Calcium
Atorvastatin Calcium
17 claims
- Amoxicillin-Clavul… 11
Amoxicillin-Clavulanate Potass
11 claims
- Furosemide 11
Furosemide
11 claims
- Naloxone Hcl 11
Naloxone Hcl
11 claims
| Drug | Claims |
|---|---|
| Cefuroxime Cefuroxime Axetil | 28 |
| Ondansetron Odt Ondansetron | 24 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 23 |
| Atorvastatin Calcium | 17 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 11 |
| Furosemide | 11 |
| Naloxone Hcl | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How Stefan Nguyen fits within the Hospitalist Physician landscape nationally.
16,938
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
Stefan Nguyen's 427 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
Dr. Zina Abbas
M.D.
Chula Vista, CA
Dr. Mehrdad Abbasi
MD
Rancho Mirage, CA
Dr. Abdul Abdali
M.D.
French Camp, CA
Dr. Anwar Abdelhadi
M.D.
Orange, CA
Dr. Farid Abdelmalak
M.D.
Santa Monica, CA
Compare Hospitalist Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Medical Specialties Explained
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Frequently Asked Questions
What is Stefan Nguyen's specialty? ▼
Stefan Nguyen specializes in Hospitalist Physician and practices in Los Angeles, California.
How much does Stefan Nguyen prescribe under Medicare Part D? ▼
In 2023, Stefan Nguyen wrote 427 Medicare Part D claims totaling $25K in drug costs for 208 beneficiaries.
Where is Stefan Nguyen located? ▼
Stefan Nguyen is located at 1500 SAN PABLO ST, Los Angeles, CA, 90033. Phone: (323) 442-5100.
What is Stefan Nguyen's NPI number? ▼
Stefan Nguyen's National Provider Identifier (NPI) is 1952842221, issued on 03/20/2017.
Does Stefan Nguyen prescribe opioids? ▼
Yes, Stefan Nguyen had 41 opioid claims in 2023 with an opioid prescribing rate of 9.6%.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,938 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does Stefan Nguyen prescribe most often? ▼
Based on 2023 Medicare Part D data, Stefan Nguyen's most frequently prescribed drugs include Cefuroxime, Ondansetron Odt, Hydrocodone-Acetaminophen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Stefan Nguyen accept Medicare? ▼
Stefan Nguyen appears in CMS Medicare data with 427 Part D claims and 208 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Stefan Nguyen's credentials? ▼
Stefan Nguyen's NPI is 1952842221. 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.