Dr. John Thomas Greenfield , MD
General Practice β’ Bronx, NY
700 White Plains Rd
Bronx, NY 104732634
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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Dr. John Greenfield is listed in NPPES under General Practice.
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NPI assigned on October 9, 2023; this date does not establish years in practice.
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Published CMS data list 36 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Diltiazem 24hr Er (Diltiazem Hcl) β 14 prescription fills, including refills.
- Quetiapine Fumarate β 11 prescription fills, including refills.
- Repaglinide β 11 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See the full table Β· Guide: How to read Medicare Part D prescriber data
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Fewer Part D prescriptions than 75% of clinicians listed under General Practice in Bronx, NY (2024, 24 clinicians with data). Median for this group: 703. Middle half: 49 to 3,699.
Fewer Part D prescriptions than 75% of clinicians listed under General Practice in New York (2024, 186 clinicians with data). Median for this group: 462. Middle half: 50 to 2,510.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
Practice Location & Contact Primary Location
700 White Plains Rd
Bronx, NY 104732634
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
What Public CMS Data Show
General Practice: NPPES taxonomy is a reported classification, not proof of board certification.
30-day fills
36 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$1,445 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers β by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $18.15 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
NPI first issued
2023
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Medicare assignment not listed
CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, βDoes your provider accept Medicare as full payment?β
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Compared with the same specialty in Bronx and New York
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
Fewer Part D prescriptions than 75% of clinicians listed under General Practice in Bronx, NY (2024, 24 clinicians with data). Median for this group: 703. Middle half: 49 to 3,699.
Fewer Part D prescriptions than 75% of clinicians listed under General Practice in New York (2024, 186 clinicians with data). Median for this group: 462. Middle half: 50 to 2,510.
Part D drug cost
A lower Part D drug cost than 70% of clinicians listed under General Practice in Bronx, NY (2024, 24 clinicians with data). Median for this group: $71,036. Middle half: $1,226 to $240,700.
A lower Part D drug cost than 70% of clinicians listed under General Practice in New York (2024, 186 clinicians with data). Median for this group: $29,331. Middle half: $1,020 to $209,203.
79 active clinicians are listed under General Practice with a practice address in Bronx, NY (682 in New York).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Bronx
8.9% of these 79 clinicians have the CMS telehealth indicator.
25.3% of these 79 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part D prescriptions
CMS data for Part D prescriptions are available for 2024 only.
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30-day fills
CMS data for 30-day fills are available for 2024 only.
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Part D drug cost
CMS data for Part D drug cost are available for 2024 only.
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Industry payments (Open Payments)
CMS data for industry payments (Open Payments) are available for 2024 only.
Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo Β· Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 β December 31, 2024): fewer than 11 records totaling $18.15.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Smith+Nephew, Inc. |
Food and Beverage
In-kind items and services
|
COLLAGENASE SANTYL | General | $18.15 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Diltiazem 24hr Er | Diltiazem Hcl | 14 | 196 | $169.26 | β |
| Quetiapine Fumarate | Quetiapine Fumarate | 11 | 289 | $449.76 | β |
| Repaglinide | Repaglinide | 11 | 330 | $826.19 | β |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2023-10-09NUCC Taxonomy Code: 208D00000X
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions.
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
General Practice
Doctor of Medicine (M.D.)
Nurse Practitioner - Family
Nurse Practitioner
Internal Medicine
Nurse Practitioner - Psychiatric/Mental Health
Registered Nurse
Nurse Practitioner - Psychiatric/Mental Health
Nurse Practitioner
Internal Medicine
Career & Practice History
NPI enumerated October 09, 2023.
No changes to the name, practice address, taxonomy or NPI status in this record have been observed in the monthly NPPES data files from November 2023 to August 2026.
NPI Administrative Meta
Other General Practices in Bronx
- Dr. Benjamin Awad, MD
- Dr. Nirav Shah, MD
- Dr. Jennifer Genuardi, MD
- Dr. Keith Fratta, MD
- Dr. Ronald Gross, MD
- Dr. Leila Mahdavian, MD
Mailing Address
2626 Halperin Ave
Bronx, NY 104612631
Phone: 7186180401