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

Dr. Mark Blaine Geyer, MD

Individual provider Hematology & Oncology Physician · NPI 1831482561

Dr. Mark Blaine Geyer, MD practises Hematology/Oncology in New York, New York. Graduated from Columbia University College of Physicians and Surgeons in 2011, 15 years ago. Practices with Memorial Hematology Lymphoma Group, a 216-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
15
Trained at
Columbia University College of Physicians and Surgeons
Licensed in
NY
In the registry since
2011
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

1275 York Ave
New York, NY 10065-6007
Phone: (212) 639-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 274263 (NY)

Record details

NPI number1831482561
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 27, 2011
Last updated in NPPESMay 8, 2020
Certification dateMay 8, 2020

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolCOLUMBIA UNIVERSITY COLLEGE OF PHYSICIANS AND SURGEONS
Graduated 2011 (15 years in practice)
Group practice Memorial Hematology Lymphoma Group — 216 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 patients204
Services billed 767 a service is one billed item, such as a visit, a test or a procedure
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.

Compensation for services other than consulting , including serving as faculty or as a speaker at a venue other than a continuing education program $4,250 1 payment
Consulting Fee $1,372 1 payment
Food and Beverage $121 2 payments · a meal or drink at a meeting or visit, not a fee
Education $8 1 payment · educational material or training, 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.

  • Vns Of Ny Home Care Chha Home health agency · New York, NY

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at Memorial Hematology Lymphoma Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 216 clinicians in the practice; 12 are shown here.

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