Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1306887302 Individual Practitioner Male Practitioner

Dr. Robert Sackstein , MD PHD

Internal Medicine • Boston, MA

Professional Overview & Biography Verified Profile Summary

Dr. Robert Sackstein, MD PHD is a registered healthcare professional specializing in Internal Medicine in Boston, MA. Practice services are available at 100 BLOSSOM STREET under active NPI credentials.

Practice Location & Contact Primary Location

Practice Address

100 Blossom Street
Hematology Oncology Associates Cox6

Boston, MA 021142617

Telephone 6177241124
Fax 6177241126
Associated Practice Facility / Clinic

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Boston, MA

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 17.4 Yrs
State Avg: 29.3 Yrs
Regional Practice Density
2379 Specialists

Practicing in Boston, MA (7127 Statewide)

Telehealth Adoption Rate
24.8% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License MA 155205

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

Internal Medicine - Hematology

NUCC Taxonomy Code: 207RH0000X

State License MA 155205

An internist with additional training who specializes in diseases of the blood, spleen and lymph. This specialist treats conditions such as anemia, clotting disorders, sickle cell disease, hemophilia, leukemia and lymphoma.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID
3186768 (MA)
Commercial Insurance / Payer ID Tufts Health Plan
155205 (MA)
Commercial Insurance / Payer ID Bcbs Ma
J19433 (MA)

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

8 Associated Practitioners
Cathleen Poliquin , NP

Nurse Practitioner - Adult Health

NPI 1235357955

Nurse Practitioner

Dr. Gabriela Hobbs , MD

Internal Medicine - Hematology & Oncology

NPI 1285893453

Doctor of Medicine (M.D.)

Dr. Thomas Spitzer , MD

Internal Medicine - Hematology

NPI 1477543783

Doctor of Medicine (M.D.)

Dr. Amir Fathi , MD

Internal Medicine - Hematology & Oncology

NPI 1548358476

Doctor of Medicine (M.D.)

Dr. Steven Mcafee , MD

Internal Medicine - Medical Oncology

NPI 1588647945

Doctor of Medicine (M.D.)

Jessica Driscoll , NP

Nurse Practitioner

NPI 1629308986

Nurse Practitioner

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events
NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

📍
Updated Practice Location July 08, 2007

Registered at 100 BLOSSOM STREET, HEMATOLOGY ONCOLOGY ASSOCIATES COX6, BOSTON, MA 021142617 (Tel: 6177241124)

📍
Updated Business Mailing Address July 08, 2007

Registered at PO BOX 9142, MASS GENERAL PHYSICIAN ORGANIZATION, CHARLESTOWN, MA 021299142 (Tel: 6177240287)

👤
Provider Name / Credentials Updated July 08, 2007

Recorded as ROBERT SACKSTEIN, MD PHD

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Internal Medicine (License #155205 in MA)

🟢
Initial NPI Registration & Enumeration June 09, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1306887302
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: June 09, 2006
Last Update: July 13, 2026
Sole Proprietor: No

Mailing Address

Po Box 9142, Mass General Physician Organization

Charlestown, MA 021299142

Phone: 6177240287

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.