Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Mark Alan Grand, MD

Individual provider Internal Medicine Physician · NPI 1487696514

Mark Alan Grand, MD practises Internal Medicine in Brooklyn, New York. Graduated from New York Medical College in 1978, 48 years ago. Practices with North Shore Hematology Oncology Associates PC, a 473-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
48
Trained at
New York Medical College
Licensed in
NY
In the registry since
2006
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

447 Atlantic Ave
Brooklyn, NY 11217-1702
Phone: (718) 858-6300
Fax: (718) 858-0145
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 101 Pennsylvania Avenue, Brooklyn, NY 11207-2428 — (718) 240-2000

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 153933 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence 1539331 (NY)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 153933 (NY)

Record details

NPI number1487696514
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 12, 2006
Last updated in NPPESSeptember 12, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesHEMATOLOGY/ONCOLOGY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1978 (48 years in practice)
Group practice North Shore Hematology Oncology Associates Pc — 473 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients131
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $121 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Colleagues at North Shore Hematology Oncology Associates PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 473 clinicians in the practice; 12 are shown here.

Other providers in Brooklyn