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

Dr. Robert Paul Hasserjian, MD

Individual provider Hematology (Pathology) Physician · NPI 1285625574

Dr. Robert Paul Hasserjian, MD is a Pathology in Boston, Massachusetts. Graduated from Harvard Medical School in 1990, 36 years ago. Practices with Massachusetts General Physicians Organization Inc, a 3,484-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
36
Trained at
Harvard Medical School
Licensed in
MA
In the registry since
2005
Specialties on file
2
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

55 Fruit St Wrn 225
Boston, MA 02114-2696
Phone: (617) 724-1445
Fax: (617) 726-7474
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology (Pathology) Physician (primary) Taxonomy 207ZH0000X · Licence 80560 (MA)
Anatomic Pathology Physician Taxonomy 207ZP0101X · Licence 80560 (MA)

Record details

NPI number1285625574
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 4, 2005
Last updated in NPPESJuly 13, 2026

Medicare enrollment

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

Medicare specialtyPATHOLOGY
Medical schoolHARVARD MEDICAL SCHOOL
Graduated 1990 (36 years in practice)
Group practice Massachusetts General Physicians Organization Inc — 3484 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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