DR. ROBERT PAUL HASSERJIAN (MD) – Hematology (Pathology) Physician, NPI 1285625574
Hematology (Pathology) Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
799 PATHOLOGY in MA
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Provider Addresses for DR. ROBERT PAUL HASSERJIAN (MD)
Charlestown Post Office (mobile), Pattern Close, St Austell Bay, Charlestown, Cornwall, England, PL25 3FQ, United Kingdom
CHARLESTOWN, MA 021299142
Phone: (617) 724-0287
Fax: (617) 726-2894
Type: Mailing
Massachusetts General Hospital, 55, Fruit Street, Beacon Hill, Boston, Suffolk County, Massachusetts, 02114, United States
WRN 225
BOSTON, MA 021142696
Phone: (617) 724-1445
Fax: (617) 726-7474
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 8 Open Payments records for all available years, with a total value of $14,892.
Total Amount is formed as General ($10,335) + Research ($4,557) + Ownership ($0) = $14,892.
Last reported payment date: 2024-05-17 • Largest payer in this snapshot: bluebird bio, Inc. ($6,300).
Total Amount
$14,892
General + Research + Ownership
Payments
8
Total payment records
General Amount
$10,335
General payments
Research Amount
$4,557
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-05-17
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| bluebird bio, Inc. | $6,300 |
| F. Hoffmann-La Roche AG | $4,557 |
| SERVIER PHARMACEUTICALS LLC | $2,835 |
| JAZZ PHARMACEUTICALS INC. | $1,200 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-07-12
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040712000532 | I | Pathology | MA | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 88341 | Special stained specimen slides to examine tissue, each additional procedure | 701 | 137 | $0 |
| 88305 | Pathology examination of tissue using a microscope, intermediate complexity | 281 | 211 | $0 |
| 88313 | Special stained specimen slides to examine tissue including interpretation and report | 243 | 176 | $0 |
| 88311 | Preparation of tissue for examination by removing any calcium present | 210 | 187 | $0 |
| 85097 | Bone marrow, smear interpretation | 199 | 176 | $0 |
Insurance plans in this area (ZIP 02129)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| N E U R O S U R G E R Y | MD | |
| - | MA | |
| Critical Care (Intensivists), Pulmonary Disease | FL | |
| Physician Assistant | MA | |
| N E U R O L O G Y | MA | |
| Nurse Practitioner | MA | |
| Orthopedic Surgery | MA | |
| Physician Assistant | NH | |
| Nurse Practitioner | MA | |
| P A T H O L O G Y | MA |
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