Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Eric I Marks, MD

Individual provider Internal Medicine Physician · NPI 1952729717

Dr. Eric I Marks, MD is an Internal Medicine Physician in Boston, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2014.

Licensed in
MA
In the registry since
2014
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

830 Harrison Ave 3rd Fl Moakley Hematology/oncology
Boston, MA 02118-2905
Phone: (617) 638-6428
Fax: (617) 638-5756
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 282064 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 282064 (MA)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 282064 (MA)

Record details

NPI number1952729717
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 30, 2014
Last updated in NPPESJune 23, 2023
Certification dateJune 23, 2023

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 patients53
Services billed 199 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

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.

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