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Internal Medicine

Mark Grand, MD

Sees patients in Brooklyn, NY · New York

Summary

Mark Grand, MD (Internal Medicine) is enrolled with Medicare at 1 practice location in Brooklyn, NY. NPI 1487696514. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(631) 751‑3000 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Mark Grand, 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
YesAccepts Medicare assignment
48Years since medical school (graduated 1978)
New York Medical CollegeMedical school
MaleGender (as listed)
North Shore Hematology Oncology Associates PCGroup practice

Quick answers

Where does Mark Grand see patients?
Medicare's clinician data lists 1 practice location in Brooklyn, NY. Call before your visit to confirm the address.
What is Mark Grand's specialty?
Medicare lists Internal Medicine as the primary specialty, and also Hematology/Oncology.
Does Mark Grand accept Medicare assignment?
Yes. Medicare's clinician data says Mark Grand accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for Mark Grand?
(631) 751-3000, as listed in official Medicare / NPI Registry data.
What is Mark Grand's NPI number?
1487696514. 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 Mark Grand is enrolled with Medicare (CMS data updated 2026-10-02).

Group practices

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

  • North Shore Hematology Oncology Associates PC479 clinicians in the group

Specialties

Find other Internal Medicine doctors in New York →

Other internal medicine doctors in Brooklyn

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

All internal medicine doctors in Brooklyn →

Clinician information

CredentialMD
Medical schoolNew York Medical College
Graduation year1978
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1487696514
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