NPI registry status
Active
2026 NPPES data Medical Physician Assistant NPI 1750665444 PA-C
Verify on CMS → Nancy Hsieh, PA-C
Medical Physician Assistant in Menlo Park, 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 40,580 in Medical Physician Assistant, 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
267
Medicare Part D claims · 186 beneficiaries · Medical Physician Assistant avg: 1K
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Nancy Hsieh, PA-C reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 267 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 267
- Part D claims, 2023
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.
Nancy Hsieh, PA-C's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Nancy Hsieh, PA-C sits
This provider among medical physician assistant peers
Across the 7,339 medical physician assistant providers who report both Medicare Part D prescribing and a MIPS quality score, Nancy Hsieh, PA-C writes more Part D claims than 43% of them and scores higher on MIPS quality than 94% - placing this provider in the lower-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one medical physician assistant peer from a representative sample of 60; the gold marker is Nancy Hsieh, PA-C. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
What does the federal data show about Nancy Hsieh, PA-C?
High performer (top quartile)Primary specialty
Medical Physician Assistant
Medicare Part D claims
267 75% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in California
How Medical Physician Assistant compares to other specialties among California providers
Medicare quality performance, MIPS
Nancy Hsieh, PA-C's 2023 MIPS final score plotted against the Medical Physician Assistant national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Medical Physician Assistant) - 100/100 vs national avg 83.1
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).
Nancy Hsieh, PA-C appears in the CMS NPPES registry as a Medical Physician Assistant provider holding PA-C credentials at 321 MIDDLEFIELD RD, Menlo Park, CA, 94025, with a listed phone of (650) 326-7222. NPI 1750665444 was issued on 09/29/2011.
Medicare Part D records for calendar year 2023 show 267 prescription claims written by this provider, covering 186 Medicare beneficiaries and totaling roughly $4K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year, compared with the national average of 83.1.
Medical Physician Assistant is a mid-sized specialty nationwide, with 40,580 enrolled providers across 55 states and an average of 1,077 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 | 1750665444 |
|---|---|
| Specialty | Medical Physician Assistant |
| Credentials | PA-C |
| Gender | Female |
| NPI Issued | 09/29/2011 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
100
Promoting Interoperability
Reporting: Individual
Hospital and facility affiliations
Facilities where Nancy Hsieh, PA-C 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.
Peninsula Dermatologic Surgery Inc
Menlo Park, 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).
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 Nancy Hsieh, PA-C. To verify Nancy Hsieh, PA-C'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.
267
Total Claims
$4K
Total Drug Cost
186
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 272
- Total Day Supply
- 3,544
- Generic Drug Cost
- $4K
- Antibiotic Claims
- 137
Patient Demographics
- Average Patient Age
- 80.8 years
- Avg HCC Risk Score
- 1.15
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 0, 65-74: 34, 75-84: 90, 85+: 62
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Nancy Hsieh, PA-C prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cephalexin
Cephalexin
96 claims
- Gentamicin Sulfate
Gentamicin Sulfate
73 claims
- Doxycycline Hyclate 17
Doxycycline Hyclate
17 claims
- Triamcinolone Acet… 14
Triamcinolone Acetonide
14 claims
- Mupirocin 13
Mupirocin
13 claims
| Drug | Claims |
|---|---|
| Cephalexin | 96 |
| Gentamicin Sulfate | 73 |
| Doxycycline Hyclate | 17 |
| Triamcinolone Acetonide | 14 |
| Mupirocin | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Medical Physician Assistant Overview
How Nancy Hsieh, PA-C fits within the Medical Physician Assistant landscape nationally.
40,580
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider
Nancy Hsieh, PA-C's 267 claims are below the specialty average of 1,077.
Nearby Medical Physician Assistant Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Hsieh.
Dr. Bridget Abajian
PA-C
Los Angeles, CA
Dr. Crispin Abbott
PHYSICIAN ASSISTANT
Thousand Oaks, CA
Dr. Abdol Hamid Abdali Hajiabadi
P.A.
Santa Ana, CA
Dr. Jilbert Abnoosian
PA
Lynwood, CA
Dr. Sakina Abowath
P.A.
Diamond Bar, CA
Compare Medical Physician Assistant 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 Medical Physician Assistant 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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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Nancy Hsieh, PA-C's specialty? ▼
Nancy Hsieh, PA-C specializes in Medical Physician Assistant and practices in Menlo Park, California. Credentials: PA-C.
How much does Nancy Hsieh, PA-C prescribe under Medicare Part D? ▼
In 2023, Nancy Hsieh, PA-C wrote 267 Medicare Part D claims totaling $4K in drug costs for 186 beneficiaries.
What is Nancy Hsieh, PA-C's Medicare quality score? ▼
Nancy Hsieh, PA-C has a CMS MIPS Final Score of 100/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Nancy Hsieh, PA-C located? ▼
Nancy Hsieh, PA-C is located at 321 MIDDLEFIELD RD, Menlo Park, CA, 94025. Phone: (650) 326-7222.
What is Nancy Hsieh, PA-C's NPI number? ▼
Nancy Hsieh, PA-C's National Provider Identifier (NPI) is 1750665444, issued on 09/29/2011.
How many Medical Physician Assistant providers are there in the US? ▼
There are 40,580 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does Nancy Hsieh, PA-C prescribe most often? ▼
Based on 2023 Medicare Part D data, Nancy Hsieh, PA-C's most frequently prescribed drugs include Cephalexin, Gentamicin Sulfate, Doxycycline Hyclate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Nancy Hsieh, PA-C accept Medicare? ▼
Nancy Hsieh, PA-C appears in CMS Medicare data with 267 Part D claims and 186 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Nancy Hsieh, PA-C's credentials? ▼
Nancy Hsieh, PA-C's NPI is 1750665444 with credentials PA-C. 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
Compiled from official public sources by the PlainDoctor editorial team.
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.