NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1952721490 M.D.
Verify on CMS → William Fuller, M.D.
Internal Medicine Physician in New York, New York.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in 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
6K
Medicare Part D claims · 360 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
79%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
100/100
▲ 17 pts above national avg 83.5 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
William Fuller, M.D. reported a CMS MIPS final score of 100/100 - above the 83.5 national average - and filed 6,338 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 6K
- Part D claims, 2023
- 79%
- generic prescribing
- 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.
William Fuller, 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.
100 ≥ 92nd percentile 92% 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 William Fuller, M.D. sits
This provider among internal medicine physician peers
Across the 34,612 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, William Fuller, M.D. writes more Part D claims than 85% of them and scores higher on MIPS quality than 93% - placing this provider in the high-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 internal medicine physician peer from a representative sample of 60; the gold marker is William Fuller, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
William Fuller, 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 William Fuller, M.D.?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
6,338 133% vs specialty avg
MIPS final score
100/100 16.5 pts vs avg
Specialty distribution in New York
How Internal Medicine Physician compares to other specialties among New York providers
Medicare quality performance, MIPS
William Fuller, M.D.'s 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 100/100
- vs 83.5 national avg · 2023 performance year
MIPS final score (Internal Medicine Physician) - 100/100 vs national avg 83.5
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).
William Fuller, M.D. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding M.D. credentials at 622 W 168TH ST, New York, NY, 10032, with a listed phone of (212) 305-9379. NPI 1952721490 was issued on 04/23/2014.
Medicare Part D records for calendar year 2023 show 6,338 prescription claims written by this provider, covering 360 Medicare beneficiaries and totaling roughly $1.2 million in drug spend, split 19% brand-name and 79% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year (Quality 86.8), compared with the 83.5 average among clinicians with a measured score.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1952721490 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/23/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Measured-score avg: 83.5
86.8066
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where William Fuller, 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.
Montefiore Medical Center
★★★☆☆ 3/5
Bronx, NY
Acute Care Hospitals
CMS CCN: 330059
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 - New York NYSBPMC 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 ~100K New York medical licensees in 2023 - they are NOT specific to William Fuller, M.D.. To verify William Fuller, M.D.'s current license status, search the NYSBPMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
312
Total board actions, New York 2023
Across 302 cases
3.12
Actions per 1,000 licensees
New York statewide rate
probation
Most common action type
89 cases
NYSBPMC 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 New York disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
William Fuller, M.D. - brand share 19.0%
Internal Medicine Physician average
19% brand-name claims vs 79% generic, on 6,338 2023 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 2023.
6,338
Total Claims
$1.2M
Total Drug Cost
360
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 13,093
- Total Day Supply
- 387,445
- Brand vs Generic
- 19% brand / 79% generic
- Brand Drug Cost
- $1.0M
- Generic Drug Cost
- $123K
- Antibiotic Claims
- 16
Patient Demographics
- Average Patient Age
- 71.6 years
- Avg HCC Risk Score
- 1.62
- Gender Split
- 66% female / 34% male
- Age Distribution
- <65: 58, 65-74: 158, 75-84: 107, 85+: 37
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Fuller, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
501 claims
- Amlodipine Besylate
Amlodipine Besylate
249 claims
- Gabapentin
Gabapentin
203 claims
- Omeprazole 191
Omeprazole
191 claims
- Metformin Hcl 174
Metformin Hcl
174 claims
- Diclofenac Sodium 171
Diclofenac Sodium
171 claims
- Albuterol Sulfate … 162
Albuterol Sulfate Hfa
162 claims
- Metoprolol Succinate 162
Metoprolol Succinate
162 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 501 |
| Amlodipine Besylate | 249 |
| Gabapentin | 203 |
| Omeprazole | 191 |
| Metformin Hcl | 174 |
| Diclofenac Sodium | 171 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 162 |
| Metoprolol Succinate | 162 |
| Famotidine | 158 |
| Fluticasone Propionate | 145 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How William Fuller, M.D. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
William Fuller, M.D.'s 6,338 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Fuller.
Dr. Deborah Aanonsen
D.O.
Staten Island, NY
Dr. Nivedita Aanur
M.D.
New York, NY
Dr. Jay Aaron
MD
Great Neck, NY
Dr. Justin Aaron
MD
New York, NY
Ahmad Abadi
Poughkeepsie, NY
Compare 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 New York medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore New York
Frequently Asked Questions
What is William Fuller, M.D.'s specialty? ▼
William Fuller, M.D. specializes in Internal Medicine Physician and practices in New York, New York. Credentials: M.D..
How much does William Fuller, M.D. prescribe under Medicare Part D? ▼
In 2023, William Fuller, M.D. wrote 6,338 Medicare Part D claims totaling $1.2M in drug costs for 360 beneficiaries.
What is William Fuller, M.D.'s Medicare quality score? ▼
William Fuller, M.D. has a CMS MIPS Final Score of 100/100 (Quality: 86.8). 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 William Fuller, M.D. located? ▼
William Fuller, M.D. is located at 622 W 168TH ST, New York, NY, 10032. Phone: (212) 305-9379.
What is William Fuller, M.D.'s NPI number? ▼
William Fuller, M.D.'s National Provider Identifier (NPI) is 1952721490, issued on 04/23/2014.
Does William Fuller, M.D. prescribe more brand-name or generic drugs? ▼
William Fuller, M.D.'s prescribing is 19% brand-name and 79% generic drugs by claim count, with $1.0M in brand drug costs.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does William Fuller, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, William Fuller, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Fuller, M.D. accept Medicare? ▼
William Fuller, M.D. appears in CMS Medicare data with 6,338 Part D claims and 360 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Fuller, M.D.'s credentials? ▼
William Fuller, M.D.'s NPI is 1952721490 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.