NPI registry status
Active
2026 NPPES data Neurology with Special Qualifications in Child Neurology Physician NPI 1851396865 MD
Verify on CMS → Jack Greenwood, MD
Neurology with Special Qualifications in Child Neurology Physician in Port Jefferson, 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 1,803 in Neurology with Special Qualifications in Child Neurology 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
389
Medicare Part D claims · 62 beneficiaries · Neurology with Special Qualifications in Child Neurology Physician avg: 359
Generic prescribing
89%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$29.69
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Jack Greenwood, MD filed 389 Medicare Part D claims in 2023 as a Neurology with Special Qualifications in Child Neurology Physician in Port Jefferson, New York, prescribing 89% generic.
- 389
- Part D claims, 2023
- 89%
- generic prescribing
- $29.69
- industry payments (Sunshine Act)
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.
Jack Greenwood, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
389 Top 43% higher than 57% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Jack Greenwood, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Jack Greenwood, MD?
Quality data not reportedPrimary specialty
Neurology with Special Qualifications in Child Neurology Physician
Medicare Part D claims
389 8% vs specialty avg
Specialty distribution in New York
How Neurology with Special Qualifications in Child Neurology Physician compares to other specialties among New York 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 Neurology with Special Qualifications in Child Neurology 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).
Jack Greenwood, MD appears in the CMS NPPES registry as a Neurology with Special Qualifications in Child Neurology Physician provider holding MD credentials at 120 N COUNTRY RD, Port Jefferson, NY, 11777, with a listed phone of (631) 474-0444. NPI 1851396865 was issued on 06/16/2005.
Medicare Part D records for calendar year 2023 show 389 prescription claims written by this provider, covering 62 Medicare beneficiaries and totaling roughly $143K in drug spend, split 11% brand-name and 89% generic by claim count.
Neurology with Special Qualifications in Child Neurology Physician is a narrow specialty nationwide, with 1,803 enrolled providers across 51 states and an average of 359 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 | 1851396865 |
|---|---|
| Specialty | Neurology with Special Qualifications in Child Neurology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/16/2005 |
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 Jack Greenwood, MD. Source: openpaymentsdata.cms.gov.
Total received
$30
Largest payer
ABBVIE INC.
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 - 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 Jack Greenwood, MD. To verify Jack Greenwood, MD'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
Jack Greenwood, MD - brand share 11.0%
Neurology with Special Qualifications in Child Neurology Physician average
11% brand-name claims vs 89% generic, on 389 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.
389
Total Claims
$143K
Total Drug Cost
62
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 706
- Total Day Supply
- 21,094
- Brand vs Generic
- 11% brand / 89% generic
- Brand Drug Cost
- $118K
- Generic Drug Cost
- $25K
Patient Demographics
- Average Patient Age
- 73.0 years
- Avg HCC Risk Score
- 1.27
- Gender Split
- 47% female / 53% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Jack Greenwood, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Donepezil Hcl
Donepezil Hcl
77 claims
- Topiramate
Topiramate
38 claims
- Gabapentin
Gabapentin
33 claims
- Lacosamide
Lacosamide
31 claims
- Carbidopa-Levodopa 22
Carbidopa-Levodopa
22 claims
- Dilantin 16
Dilantin
16 claims
- Levetiracetam 15
Levetiracetam
15 claims
- Rizatriptan 14
Rizatriptan
14 claims
| Drug | Claims |
|---|---|
| Donepezil Hcl | 77 |
| Topiramate | 38 |
| Gabapentin | 33 |
| Lacosamide | 31 |
| Carbidopa-Levodopa Carbidopa/Levodopa | 22 |
| Dilantin Phenytoin Sodium Extended | 16 |
| Levetiracetam | 15 |
| Rizatriptan Rizatriptan Benzoate | 14 |
| Avonex Pen Interferon Beta-1a | 13 |
| Tegretol Carbamazepine | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Neurology with Special Qualifications in Child Neurology Physician in NY →
All providers in New York →
Compare specialties →
Neurology with Special Qualifications in Child Neurology Physician Overview
How Jack Greenwood, MD fits within the Neurology with Special Qualifications in Child Neurology Physician landscape nationally.
1,803
Neurology with Special Qualifications in Child Neurology Physician Providers in US
51
States with Neurology with Special Qualifications in Child Neurology Physician
359
Avg Claims per Provider
Jack Greenwood, MD's 389 claims are above the specialty average of 359.
Nearby Neurology with Special Qualifications in Child Neurology Physician Providers in New York
Other clinicians with the same primary specialty enrolled in New York, drawn from the same CMS NPPES roster as Greenwood.
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 Neurology with Special Qualifications in Child Neurology 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 Jack Greenwood, MD's specialty? ▼
Jack Greenwood, MD specializes in Neurology with Special Qualifications in Child Neurology Physician and practices in Port Jefferson, New York. Credentials: MD.
How much does Jack Greenwood, MD prescribe under Medicare Part D? ▼
In 2023, Jack Greenwood, MD wrote 389 Medicare Part D claims totaling $143K in drug costs for 62 beneficiaries.
Where is Jack Greenwood, MD located? ▼
Jack Greenwood, MD is located at 120 N COUNTRY RD, Port Jefferson, NY, 11777. Phone: (631) 474-0444.
What is Jack Greenwood, MD's NPI number? ▼
Jack Greenwood, MD's National Provider Identifier (NPI) is 1851396865, issued on 06/16/2005.
Does Jack Greenwood, MD prescribe more brand-name or generic drugs? ▼
Jack Greenwood, MD's prescribing is 11% brand-name and 89% generic drugs by claim count, with $118K in brand drug costs.
How many Neurology with Special Qualifications in Child Neurology Physician providers are there in the US? ▼
There are 1,803 Neurology with Special Qualifications in Child Neurology Physician providers across 51 states in the US. The average Neurology with Special Qualifications in Child Neurology Physician provider writes 359 Medicare Part D claims per year.
What drugs does Jack Greenwood, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Jack Greenwood, MD's most frequently prescribed drugs include Donepezil Hcl, Topiramate, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Jack Greenwood, MD accept Medicare? ▼
Jack Greenwood, MD appears in CMS Medicare data with 389 Part D claims and 62 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Jack Greenwood, MD's credentials? ▼
Jack Greenwood, MD's NPI is 1851396865 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 (2023). 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 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.