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

Dr. Robert James Mayer, MD

Individual provider Internal Medicine Physician · NPI 1659361327

Dr. Robert James Mayer, MD is a Medical Oncology in Boston, Massachusetts. Graduated from Harvard Medical School in 1969, 57 years ago. Practices with Dana-Farber Cancer Institute, Inc, a 668-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
57
Trained at
Harvard Medical School
Licensed in
MA
In the registry since
2005
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

450 Brookline Ave Dana Farber Cancer Institute D-1608
Boston, MA 02215-5418
Phone: (617) 632-3474
Fax: (617) 632-2260
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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 36776 (MA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 36776 (MA)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 36776 (MA)

Record details

NPI number1659361327
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedOctober 25, 2005
Last updated in NPPESDecember 7, 2011

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1969 (57 years in practice)
Group practice Dana-Farber Cancer Institute, Inc. — 668 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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