NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1043244130 M.D.
Verify on CMS → Stuart Greenberg, M.D.
Internal Medicine Physician in West Islip, 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
1K
Medicare Part D claims · 485 beneficiaries · Internal Medicine Physician avg: 3K
MIPS score
75/100
CMS neutral threshold · no category scores published
What the federal data shows
Stuart Greenberg, M.D. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 1,089 Medicare Part D claims in 2023.
- 75/100
- CMS neutral score · not measured
- 1K
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥76th
- 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.
Stuart Greenberg, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,089 ≥ 76th percentile 76% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Stuart Greenberg, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Stuart Greenberg, M.D.?
CMS neutral score, not measuredPrimary specialty
Internal Medicine Physician
Medicare Part D claims
1,089 60% vs specialty avg
MIPS final score
75/100
Specialty distribution in New York
How Internal Medicine Physician compares to other specialties among New York providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
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).
Stuart Greenberg, M.D. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding M.D. credentials at 434 SUNRISE HWY, West Islip, NY, 11795, with a listed phone of (631) 376-1499. NPI 1043244130 was issued on 07/11/2006.
Medicare Part D records for calendar year 2023 show 1,089 prescription claims written by this provider, covering 485 Medicare beneficiaries and totaling roughly $50K in drug spend, with an opioid prescribing rate of 6.4%. On the CMS Merit-based Incentive Payment System, this provider carries a Final Score of 75/100 for the 2023 performance year, but CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score: this is the neutral performance threshold CMS assigns where nothing was scored, so it is not comparable with clinicians whose score was measured.
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 | 1043244130 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 07/11/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Individual
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 Stuart Greenberg, M.D.. To verify Stuart Greenberg, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
1,089
Total Claims
$50K
Total Drug Cost
485
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,120
- Total Day Supply
- 23,366
- Generic Drug Cost
- $15K
- Opioid Claims
- 70 (6.4% rate)
- Antibiotic Claims
- 234
Patient Demographics
- Average Patient Age
- 77.0 years
- Avg HCC Risk Score
- 2.06
- Gender Split
- 44% female / 56% male
- Age Distribution
- <65: 42, 65-74: 142, 75-84: 187, 85+: 114
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Stuart Greenberg, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Cefdinir
Cefdinir
61 claims
- Metoprolol Succinate
Metoprolol Succinate
47 claims
- Cephalexin
Cephalexin
44 claims
- Prednisone
Prednisone
44 claims
- Clopidogrel
Clopidogrel
36 claims
- Diltiazem 24hr Er …
Diltiazem 24hr Er (Cd)
30 claims
- Eliquis
Eliquis
30 claims
- Amoxicillin-Clavul…
Amoxicillin-Clavulanate Potass
29 claims
| Drug | Claims |
|---|---|
| Cefdinir | 61 |
| Metoprolol Succinate | 47 |
| Cephalexin | 44 |
| Prednisone | 44 |
| Clopidogrel Clopidogrel Bisulfate | 36 |
| Diltiazem 24hr Er (Cd) Diltiazem Hcl | 30 |
| Eliquis Apixaban | 30 |
| Amoxicillin-Clavulanate Potass Amoxicillin/Potassium Clav | 29 |
| Atorvastatin Calcium | 29 |
| Potassium Chloride | 28 |
* 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 Stuart Greenberg, 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
Stuart Greenberg, M.D.'s 1,089 claims are below 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 Greenberg.
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.
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Frequently Asked Questions
What is Stuart Greenberg, M.D.'s specialty? ▼
Stuart Greenberg, M.D. specializes in Internal Medicine Physician and practices in West Islip, New York. Credentials: M.D..
How much does Stuart Greenberg, M.D. prescribe under Medicare Part D? ▼
In 2023, Stuart Greenberg, M.D. wrote 1,089 Medicare Part D claims totaling $50K in drug costs for 485 beneficiaries.
What is Stuart Greenberg, M.D.'s Medicare quality score? ▼
Stuart Greenberg, M.D. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. 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 Stuart Greenberg, M.D. located? ▼
Stuart Greenberg, M.D. is located at 434 SUNRISE HWY, West Islip, NY, 11795. Phone: (631) 376-1499.
What is Stuart Greenberg, M.D.'s NPI number? ▼
Stuart Greenberg, M.D.'s National Provider Identifier (NPI) is 1043244130, issued on 07/11/2006.
Does Stuart Greenberg, M.D. prescribe opioids? ▼
Yes, Stuart Greenberg, M.D. had 70 opioid claims in 2023 with an opioid prescribing rate of 6.4%.
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 Stuart Greenberg, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Stuart Greenberg, M.D.'s most frequently prescribed drugs include Cefdinir, Metoprolol Succinate, Cephalexin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Stuart Greenberg, M.D. accept Medicare? ▼
Stuart Greenberg, M.D. appears in CMS Medicare data with 1,089 Part D claims and 485 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Stuart Greenberg, M.D.'s credentials? ▼
Stuart Greenberg, M.D.'s NPI is 1043244130 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.