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

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
Show map & directions

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
Mailing address450 Brookline Ave, D-1608, Boston, MA 02215-5418

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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