Jack Greenwood, MD
NPI 1851396865 · Neurology with Special Qualifications in Child Neurology Physician · Port Jefferson, NY
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jack Greenwood, MD is a Neurology with Special Qualifications in Child Neurology Physician provider in Port Jefferson, NY (NPI 1851396865).
Provider details
- NPI number
- 1851396865
- Entity type
- Individual
- Primary specialty
- Neurology with Special Qualifications in Child Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 124686 (NY)
Specialties & taxonomies
- Neurology with Special Qualifications in Child Neurology PhysicianPrimary2084N0402XLicense 124686 (NY)
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
334 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 92 | $146 |
| Test to Assess Balance During Warm and Cool Irrigation in Both Ears92537 | 53 | $30 |
| Evaluation and Testing for Balance With Recording92540 | 53 | $76 |
| Test for Abnormal Eye Movement Using a Rotating Chair92546 | 53 | $35 |
| Test for Balance and Posture92548 | 53 | $33 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 18 | $246 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Donepezil Hcl | 54 | 11 |
| Gabapentin | 40 | 12 |
| Topiramate | 30 | — |
| Lacosamide | 24 | — |
| Levetiracetam | 14 | — |
| Interferon Beta-1abrand: Avonex Pen (4 Pack) | 13 | — |
| Primidone | 13 | — |
| Phenytoin Sodium Extended |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$30 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-16
- Last updated
- 2008-04-02
Frequently asked questions
- What is Jack Greenwood's NPI number?
- Jack Greenwood's National Provider Identifier (NPI) is 1851396865, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jack Greenwood's specialty?
- Jack Greenwood is listed in the NPPES registry with a primary specialty of Neurology with Special Qualifications in Child Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Jack Greenwood located?
- Jack Greenwood's practice location on file with NPPES is 120 N Country Rd, Port Jefferson, NY 11777-2604.
- What is Jack Greenwood's phone number?
- The practice phone number listed in the NPPES registry for Jack Greenwood is (631) 474-0444.
- Does Jack Greenwood accept Medicare?
- Jack Greenwood is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jack Greenwood's NPI active?
- Yes — Jack Greenwood's NPI (1851396865) is active in the NPPES registry as of the last update on 2008-04-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.