NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1528083664 M.D.
Verify on CMS → Hoa Nguyen, M.D.
Hematology (Internal Medicine) Physician in Marysville, 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 1,451 in Hematology (Internal Medicine) 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 · 134 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
MIPS score
90.9/100
▲ 7 pts above national avg 83.5 · Exceptional
Industry payments
$151.65
3 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Hoa Nguyen, M.D. reported a CMS MIPS final score of 90.9/100 - above the 83.5 national average - and filed 573 Medicare Part D claims in 2023.
- 90.9/100
- MIPS score · +7 vs avg
- 573
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥58th
- pct among measured MIPS (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.
Hoa Nguyen, M.D.'s MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
91 ≥ 58th percentile 58% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. 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 whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Hoa Nguyen, M.D. sits
This provider among hematology (internal medicine) physician peers
Across the 446 hematology (internal medicine) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Hoa Nguyen, M.D. writes more Part D claims than 64% of them and scores higher on MIPS quality than 56% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one hematology (internal medicine) physician peer from a representative sample of 60; the gold marker is Hoa Nguyen, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Hoa Nguyen, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Hoa Nguyen, M.D.?
High performer (top quartile)Primary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
573 17% vs specialty avg
MIPS final score
90.9/100 7.4 pts vs avg
Specialty distribution in California
How Hematology (Internal Medicine) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Hoa Nguyen, M.D.'s 2023 MIPS final score plotted against the Hematology (Internal Medicine) Physician national average
- MIPS Final Score
- 90.9/100
- vs 83.5 national avg · 2023 performance year
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).
Hoa Nguyen, M.D. appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding M.D. credentials at 618 5TH ST, Marysville, CA, 95901, with a listed phone of (530) 749-4400. NPI 1528083664 was issued on 07/12/2006.
Medicare Part D records for calendar year 2023 show 573 prescription claims written by this provider, covering 134 Medicare beneficiaries and totaling roughly $1.4 million in drug spend, with an opioid prescribing rate of 6.5%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 90.9/100 for the 2023 performance year (Quality 63.4), compared with the 83.5 average among clinicians with a measured score.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,451 enrolled providers across 50 states and an average of 693 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 | 1528083664 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/12/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
90.928
Final Score
Measured-score avg: 83.5
63.354
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Hoa Nguyen, M.D. 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.
Regents OF The University OF California
Marysville, 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 Hoa Nguyen, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$152
Largest payer
Teleflex LLC
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 Hoa Nguyen, M.D.. To verify Hoa Nguyen, M.D.'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.
573
Total Claims
$1.4M
Total Drug Cost
134
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 808
- Total Day Supply
- 21,194
- Generic Drug Cost
- $51K
- Opioid Claims
- 37 (6.5% rate)
Patient Demographics
- Average Patient Age
- 73.6 years
- Avg HCC Risk Score
- 1.89
- Gender Split
- 65% female / 35% male
- Age Distribution
- <65: 12, 65-74: 58, 75-84: 51, 85+: 13
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Hoa Nguyen, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Ondansetron Hcl
Ondansetron Hcl
77 claims
- Anastrozole
Anastrozole
62 claims
- Promethazine Hcl
Promethazine Hcl
40 claims
- Letrozole
Letrozole
31 claims
- Revlimid 24
Revlimid
24 claims
- Hydrocodone-Acetam… 21
Hydrocodone-Acetaminophen
21 claims
- Dexamethasone 20
Dexamethasone
20 claims
- Eliquis 17
Eliquis
17 claims
| Drug | Claims |
|---|---|
| Ondansetron Hcl | 77 |
| Anastrozole | 62 |
| Promethazine Hcl | 40 |
| Letrozole | 31 |
| Revlimid Lenalidomide | 24 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 21 |
| Dexamethasone | 20 |
| Eliquis Apixaban | 17 |
| Naloxone Hcl | 17 |
| Allopurinol | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in CA →
All providers in California →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How Hoa Nguyen, M.D. fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,451
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
Hoa Nguyen, M.D.'s 573 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) 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 125 Hematology (Internal Medicine) Physician providers enrolled in California, 5 are shown here.
Dr. Haifaa Abdulhaq
MD
Fresno, CA
Dr. John Adamson
MD
San Diego, CA
Dr. Idoroenyi Amanam
M.D.
Duarte, CA
Dr. Ian Anderson
M.D.
Santa Rosa, CA
Dr. Sally Arai
MD
Stanford, CA
Compare Hematology (Internal Medicine) 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 Hematology (Internal Medicine) 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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Frequently Asked Questions
What is Hoa Nguyen, M.D.'s specialty? ▼
Hoa Nguyen, M.D. specializes in Hematology (Internal Medicine) Physician and practices in Marysville, California. Credentials: M.D..
How much does Hoa Nguyen, M.D. prescribe under Medicare Part D? ▼
In 2023, Hoa Nguyen, M.D. wrote 573 Medicare Part D claims totaling $1.4M in drug costs for 134 beneficiaries.
What is Hoa Nguyen, M.D.'s Medicare quality score? ▼
Hoa Nguyen, M.D. has a CMS MIPS Final Score of 90.9/100 (Quality: 63.4). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Hoa Nguyen, M.D. located? ▼
Hoa Nguyen, M.D. is located at 618 5TH ST, Marysville, CA, 95901. Phone: (530) 749-4400.
What is Hoa Nguyen, M.D.'s NPI number? ▼
Hoa Nguyen, M.D.'s National Provider Identifier (NPI) is 1528083664, issued on 07/12/2006.
Does Hoa Nguyen, M.D. prescribe opioids? ▼
Yes, Hoa Nguyen, M.D. had 37 opioid claims in 2023 with an opioid prescribing rate of 6.5%.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,451 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does Hoa Nguyen, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Hoa Nguyen, M.D.'s most frequently prescribed drugs include Ondansetron Hcl, Anastrozole, Promethazine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Hoa Nguyen, M.D. accept Medicare? ▼
Hoa Nguyen, M.D. appears in CMS Medicare data with 573 Part D claims and 134 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Hoa Nguyen, M.D.'s credentials? ▼
Hoa Nguyen, M.D.'s NPI is 1528083664 with credentials M.D.. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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.