Robert Sackstein, MD PHD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

155205 Issued in MA

Practice address

100 Blossom Street
Hematology Oncology Associates Cox6
Boston, MA 02114-2617

Phone

(617) 724-1124

Fax

(617) 724-1126

NPI assigned

Jun 9, 2006

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Other identifiers 3

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Doctor of Philosophy

State licenses

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1149811200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1306887302",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 9142",
            "address_2": "MASS GENERAL PHYSICIAN ORGANIZATION",
            "city": "CHARLESTOWN",
            "state": "MA",
            "postal_code": "021299142",
            "telephone_number": "617-724-0287",
            "fax_number": "617-726-2894"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 BLOSSOM STREET",
            "address_2": "HEMATOLOGY ONCOLOGY ASSOCIATES COX6",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021142617",
            "telephone_number": "617-724-1124",
            "fax_number": "617-724-1126"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "SACKSTEIN",
        "first_name": "ROBERT",
        "name_prefix": "Dr.",
        "credential": "MD PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-09",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "155205",
            "primary": true
        },
        {
            "code": "207RH0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology",
            "state": "MA",
            "license": "155205",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TUFTS HEALTH PLAN",
            "identifier": "155205",
            "state": "MA"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3186768",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS MA",
            "identifier": "J19433",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Chana A. Sacks, MD
• David B Sacks, M.D.
• Frank M Sacks, MD
• Nathan Joseph Sacks
• Rachel Sacks
• Kesavan Sadacharam, M.D
• Gouri Sadananda, MD
• Abdollah Sadeghi-Nejad, MD
• Nakisa Sadeghi
• George Sadek, MD

• Internal Medicine Physician in Boston, MA
• Providers in Boston, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.