NPI registry status
Active
2026 NPPES data Nephrology Physician NPI 1558344382 MD
Verify on CMS → Vo Nguyen, MD
Nephrology Physician in Olympia, Washington.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 10,806 in Nephrology 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
573
Medicare Part D claims · 83 beneficiaries · Nephrology Physician avg: 2K
Generic prescribing
94%
generic claims · 6% 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
Vo Nguyen, MD filed 573 Medicare Part D claims in 2024 as a Nephrology Physician in Olympia, Washington, prescribing 94% generic.
- 573
- Part D claims, 2024
- 94%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥65th
- 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 Vo Nguyen, MD
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 1558344382), first enumerated 11/25/2005.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 573 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
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Washington statewide board action statistics are published annually — these figures describe aggregate state activity, not Vo Nguyen, MD's individual license status. Verify directly with the state medical board.
Source: WMC 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 1558344382 · Nephrology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1558344382
- ENUM-LEGACY 2005
- TAX-MID 11K Nephrology Physician
- RX-LIGHT 573
- BOOK-THIN 206 in Washington
- PHOTO-ENUM Christopher Cosgrove… · 2005
Vo Nguyen, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
573 ≥ 65th percentile 65% 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 certification likely (heuristic, not verified)
Vo Nguyen, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations - 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 Vo Nguyen, MD?
Quality data not reportedPrimary specialty
Nephrology Physician
Medicare Part D claims
573 62% vs specialty avg
Specialty distribution in Washington
How Nephrology Physician compares to other specialties among Washington 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 Nephrology 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 | 1558344382 |
|---|---|
| Specialty | Nephrology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/25/2005 |
Hospital and facility affiliations
Facilities where Vo Nguyen, MD 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.
Hawaii Permanente Medical Group Inc
Wailuku, HI
Memorial Nephrology Associates PLLC
Olympia, WA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
License & disciplinary context - Washington WMC 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 ~34K Washington medical licensees in 2023 - they are NOT specific to Vo Nguyen, MD. To verify Vo Nguyen, MD's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases
WMC 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 Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Generic-heavy
Vo Nguyen, MD - brand share 6.0%
Nephrology Physician average
6% brand-name claims vs 94% generic, on 573 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.
573
Total Claims
$64K
Total Drug Cost
83
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,178.167
- Total Day Supply
- 34,896
- Brand vs Generic
- 6% brand / 94% generic
- Brand Drug Cost
- $26K
- Generic Drug Cost
- $38K
Patient Demographics
- Average Patient Age
- 65.9 years
- Avg HCC Risk Score
- 5.77
- Gender Split
- 41% female / 59% male
- Age Distribution
- <65: 36, 65-74: 26, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Vo Nguyen, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Cinacalcet Hcl
Cinacalcet Hcl
36 claims
- Sevelamer Carbonate
Sevelamer Carbonate
35 claims
- Calcium Acetate
Calcium Acetate
31 claims
- Furosemide
Furosemide
30 claims
- Prednisone
Prednisone
27 claims
- Carvedilol
Carvedilol
26 claims
- Calcitriol
Calcitriol
24 claims
- Amlodipine Besylate
Amlodipine Besylate
21 claims
| Drug | Claims |
|---|---|
| Cinacalcet Hcl | 36 |
| Sevelamer Carbonate | 35 |
| Calcium Acetate | 31 |
| Furosemide | 30 |
| Prednisone | 27 |
| Carvedilol | 26 |
| Calcitriol | 24 |
| Amlodipine Besylate | 21 |
| Losartan Potassium | 18 |
| Metoprolol Succinate | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Nephrology Physician Overview
How Vo Nguyen, MD fits within the Nephrology Physician landscape nationally.
10,806
Nephrology Physician Providers in US
55
States with Nephrology Physician
1,511
Avg Claims per Provider
Vo Nguyen, MD's 573 claims are below the specialty average of 1,511.
Nationwide Nephrology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nguyen, both outside Washington so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Nephrology Physician Providers in Washington
Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as Nguyen.
One of 206 Nephrology Physician providers enrolled in Washington, 5 are shown here.
Dr. Samer Abdulkhalek
MD
Spokane, WA
Dr. Christine Abrass
MD
Mercer Island, WA
Suhail Ahmad
Seattle, WA
Dr. Razan Al Kudsi
MD
Burien, WA
Dr. Astier Alem
MD
Kirkland, WA
Compare Nephrology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Vo Nguyen, MD's specialty? ▼
Vo Nguyen, MD specializes in Nephrology Physician and practices in Olympia, Washington. Credentials: MD.
How much does Vo Nguyen, MD prescribe under Medicare Part D? ▼
In 2024, Vo Nguyen, MD wrote 573 Medicare Part D claims totaling $64K in drug costs for 83 beneficiaries.
Where is Vo Nguyen, MD located? ▼
Vo Nguyen, MD is located at 3525 ENSIGN RD NE, Olympia, WA, 98506. Phone: (360) 413-8121.
What is Vo Nguyen, MD's NPI number? ▼
Vo Nguyen, MD's National Provider Identifier (NPI) is 1558344382, issued on 11/25/2005.
Does Vo Nguyen, MD prescribe more brand-name or generic drugs? ▼
Vo Nguyen, MD's prescribing is 6% brand-name and 94% generic drugs by claim count, with $26K in brand drug costs.
How many Nephrology Physician providers are there in the US? ▼
There are 10,806 Nephrology Physician providers across 55 states in the US. The average Nephrology Physician provider writes 1,511 Medicare Part D claims per year.
What drugs does Vo Nguyen, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Vo Nguyen, MD's most frequently prescribed drugs include Cinacalcet Hcl, Sevelamer Carbonate, Calcium Acetate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Vo Nguyen, MD accept Medicare? ▼
Vo Nguyen, MD appears in CMS Medicare data with 573 Part D claims and 83 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Vo Nguyen, MD's credentials? ▼
Vo Nguyen, MD's NPI is 1558344382 with credentials MD. 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.