NPI registry status
Active
2026 NPPES data Urology Physician NPI 1477188696
Verify on CMS → Charles Nguyen
Urology Physician in San Jose, 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 13,606 in Urology 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
210
Medicare Part D claims · 91 beneficiaries · Urology Physician avg: 1K
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Charles Nguyen filed 210 Medicare Part D claims in 2024 as a Urology Physician in San Jose, California, prescribing 89% generic.
- 210
- Part D claims, 2024
- 89%
- generic prescribing
- ≥48th
- 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.
Federal trust snapshot
What official records show about Charles Nguyen
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1477188696), first enumerated 03/09/2020.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 210 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Practices in an ABMS-board-eligible specialty; board certification not confirmed in federal records.
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Charles Nguyen's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1477188696 · Urology Physician
NPI-10 · ENUM-RECENT · TAX-MID · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1477188696
- ENUM-RECENT 2020
- TAX-MID 14K Urology Physician
- RX-LIGHT 210
- BOOK-LIGHT 1,421 in California
- PHOTO-ENUM Matthew Murtha · 2020
Charles Nguyen's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
210 ≥ 48th percentile 48% of 1,416,883 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 · 2024
◑
Board-eligible specialty (heuristic, not verified)
Charles Nguyen practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Charles Nguyen?
Quality data not reportedPrimary specialty
Urology Physician
Medicare Part D claims
210 84% vs specialty avg
Specialty distribution in California
How Urology 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 Urology 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).
Practice Address
Provider Details
| NPI | 1477188696 |
|---|---|
| Specialty | Urology Physician |
| Gender | Male |
| NPI Issued | 03/09/2020 |
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 Charles Nguyen. To verify Charles 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.
Brand vs generic prescribing mix · Typical
Charles Nguyen - brand share 11.0%
Urology Physician average
11% brand-name claims vs 89% generic, on 210 2024 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 2024.
210
Total Claims
$66K
Total Drug Cost
91
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 357.833
- Total Day Supply
- 9,079
- Brand vs Generic
- 11% brand / 89% generic
- Brand Drug Cost
- $62K
- Generic Drug Cost
- $4K
- Opioid Claims
- 14 (6.7% rate)
- Antibiotic Claims
- 37
Patient Demographics
- Average Patient Age
- 74.0 years
- Avg HCC Risk Score
- 1.88
- Gender Split
- 26% female / 74% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Charles Nguyen prescribes most
Top Medicare Part D drugs by claim count, 2024
- Tamsulosin Hcl
Tamsulosin Hcl
52 claims
- Finasteride
Finasteride
23 claims
- Cephalexin 20
Cephalexin
20 claims
- Myrbetriq 15
Myrbetriq
15 claims
- Trospium Chloride 13
Trospium Chloride
13 claims
- Oxycodone-Acetamin… 12
Oxycodone-Acetaminophen
12 claims
- Solifenacin Succin… 12
Solifenacin Succinate
12 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 52 |
| Finasteride | 23 |
| Cephalexin | 20 |
| Myrbetriq Mirabegron | 15 |
| Trospium Chloride | 13 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 12 |
| Solifenacin Succinate | 12 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Urology Physician Overview
How Charles Nguyen fits within the Urology Physician landscape nationally.
13,606
Urology Physician Providers in US
54
States with Urology Physician
1,354
Avg Claims per Provider
Charles Nguyen's 210 claims are below the specialty average of 1,354.
Nationwide Urology Physician 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 (2020)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Urology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
One of 1,421 Urology Physician providers enrolled in California, 5 are shown here.
Dr. David Aaronson
MD
Oakland, CA
Dr. Jason Abber
MD
Panorama City, CA
Dr. Marc Abboud
MD
Los Alamitos, CA
George Abdelsayed
Anaheim, CA
Garen Abedi
Downey, CA
Compare Urology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Charles Nguyen's specialty? ▼
Charles Nguyen specializes in Urology Physician and practices in San Jose, California.
How much does Charles Nguyen prescribe under Medicare Part D? ▼
In 2024, Charles Nguyen wrote 210 Medicare Part D claims totaling $66K in drug costs for 91 beneficiaries.
Where is Charles Nguyen located? ▼
Charles Nguyen is located at 2460 SAMARITAN DR, San Jose, CA, 95124. Phone: (408) 871-5220.
What is Charles Nguyen's NPI number? ▼
Charles Nguyen's National Provider Identifier (NPI) is 1477188696, issued on 03/09/2020.
Does Charles Nguyen prescribe more brand-name or generic drugs? ▼
Charles Nguyen's prescribing is 11% brand-name and 89% generic drugs by claim count, with $62K in brand drug costs.
Does Charles Nguyen prescribe opioids? ▼
Yes, Charles Nguyen had 14 opioid claims in 2024 with an opioid prescribing rate of 6.7%.
How many Urology Physician providers are there in the US? ▼
There are 13,606 Urology Physician providers across 54 states in the US. The average Urology Physician provider writes 1,354 Medicare Part D claims per year.
What drugs does Charles Nguyen prescribe most often? ▼
Based on 2024 Medicare Part D data, Charles Nguyen's most frequently prescribed drugs include Tamsulosin Hcl, Finasteride, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Nguyen accept Medicare? ▼
Charles Nguyen appears in CMS Medicare data with 210 Part D claims and 91 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Nguyen's credentials? ▼
Charles Nguyen's NPI is 1477188696. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.