DR. ROBERT PAUL HASSERJIAN MD
NPI 1285625574
Pathology - Hematology in Boston, MA
About Dr. Robert Paul Hasserjian Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ROBERT PAUL HASSERJIAN MD (NPI 1285625574) is an individual hematology provider in Boston, Massachusetts, licensed in Massachusetts (80560) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Cooley Dickinson Hospital Inc,the, and is a graduate of Harvard Medical School (1990).
NPPES Registry Identity
Specialties & Licenses 2
Other Identifiers 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Robert Paul Hasserjian Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 16
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cooley Dickinson Hospital Inc,the
Acute Care Hospitals · Northampton, MAMassachusetts General Hospital
Acute Care Hospitals · Boston, MAMassachusetts Eye And Ear Infirmary -
Acute Care Hospitals · Boston, MABrigham And Women's Hospital
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02114 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Robert Hasserjian's NPI number?
The NPI number for Robert Hasserjian is 1285625574. It was assigned to this individual provider in the NPPES registry on November 4, 2005.
Where is Robert Hasserjian located?
Robert Hasserjian practices at 55 Fruit St Wrn 225, Boston, MA 02114. The listed phone number is (617) 724-1445.
What is Robert Hasserjian's specialty?
The primary specialty registered for this NPI is Pathology, specializing in Hematology, with taxonomy code 207ZH0000X.
Is Robert Hasserjian enrolled in Medicare?
Yes. Robert Hasserjian is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Is Robert Hasserjian affiliated with any hospitals?
According to CMS data, Robert Hasserjian is affiliated with Cooley Dickinson Hospital Inc,the, Massachusetts General Hospital, Massachusetts Eye And Ear Infirmary - and Brigham And Women's Hospital.
When was this NPI record last updated?
The NPPES record for Robert Hasserjian was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.