Medical emergency?Emergency? Call 911. Nearest emergency roomsNearest ERs

Español Near me My list Help
US Patient GuideUSA
Surprise me
Internal Medicine

Debra Greenfield, MD

Sees patients in Smithtown, NY · New York

Summary

Debra Greenfield, MD (Internal Medicine) is enrolled with Medicare at 1 practice location in Smithtown, NY. NPI 1558525964. Source: CMS National Downloadable File, updated 2026-10-02.

Call(631) 366‑2333 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Debra Greenfield, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

1Practice location
Internal MedicinePrimary specialty
May acceptAccepts Medicare assignment
44Years since medical school (graduated 1982)
Icahn School Of Medicine At Mount SinaiMedical school
FemaleGender (as listed)
Dr Michael Kaplan DO PCGroup practice

Quick answers

Where does Debra Greenfield see patients?
Medicare's clinician data lists 1 practice location in Smithtown, NY. Call before your visit to confirm the address.
What is Debra Greenfield's specialty?
Medicare lists Internal Medicine as the primary specialty.
Does Debra Greenfield accept Medicare assignment?
Medicare's clinician data says Debra Greenfield may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
What is the phone number for Debra Greenfield?
(631) 366-2333, as listed in official Medicare / NPI Registry data.
What is Debra Greenfield's NPI number?
1558525964. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Debra Greenfield is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

Medicare enrollment lists Debra Greenfield as a member of this group (CMS data updated 2026-10-02).

  • Dr Michael Kaplan DO PC2 clinicians in the group

Specialties

Find other Internal Medicine doctors in New York →

Other internal medicine doctors in Smithtown

Clinicians with the same Medicare primary specialty in Smithtown, NY — not a recommendation.

All internal medicine doctors in Smithtown →

Clinician information

CredentialMD
Medical schoolIcahn School Of Medicine At Mount Sinai
Graduation year1982
Gender (as listed)Female
Medicare assignmentMay accept for some services
NPI (National Provider Identifier)1558525964
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians