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

Dr. Mark Nathan Stein, MD

Individual provider Hematology (Internal Medicine) Physician · NPI 1568549319

Dr. Mark Nathan Stein, MD practises Medical Oncology in New York, New York. Graduated from New York Medical College in 1998, 28 years ago. Practices with Trustees of Columbia University in the City of New York, a 2,250-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in New Jersey and New York.

Years since qualifying
28
Trained at
New York Medical College
Licensed in
NJ, 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

161 Fort Washington Ave Fl 9
New York, NY 10032-3729
Phone: (212) 305-5874
Fax: (212) 305-6762
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 195 Little Albany St, New Brunswick, NJ 08901-1914 — (732) 235-2465

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 215813 (NY)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 215813 (NY)
Medical Oncology Physician Taxonomy 207RX0202X · Licence 25MA07779100 (NJ)

Record details

NPI number1568549319
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 1, 2006
Last updated in NPPESMarch 1, 2023
Certification dateMarch 1, 2023

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1998 (28 years in practice)
Group practice Trustees Of Columbia University In The City Of New York — 2250 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 patients226
Services billed 955 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Consulting Fee $7,410 4 payments
Honoraria $2,310 1 payment
Travel and Lodging $1,548 7 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $403 3 payments · 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.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Trustees of Columbia University in the City of New York

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2250 clinicians in the practice; 12 are shown here.

Other providers in New York