Gary L Horowitz, M.D.

Primary specialty

Chemical Pathology PhysicianTaxonomy code 207ZP0104X

License

44883 Issued in MA

Practice address

Beth Israel Hospital
Dept of Pathology
Boston, MA 02215

Phone

(617) 667-3648

NPI assigned

Jun 1, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MA

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Pathology

Education

Harvard Medical School, 1976

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Pratt Pathology Associates IncGroup PAC ID 0345131637, 24 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Tufts Medical Center Hospital, Boston, MA, CCN 220116
• Lowell General Hospital Hospital, Lowell, MA, CCN 220063
• Metrowest Medical Center Hospital, Framingham, MA, CCN 220175
• Melrosewakefield Healthcare Hospital, Melrose, MA, CCN 220070

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Pratt Pathology Associates, Inc

  dba Pratt Associates

  • Anatomic Pathology Physician
  • Boston, MA
  • NPI 1659312189
  Medicare reassignment Care Compare group NPD
• Beth Israel Deaconess Medical Center, Inc.

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1548202641
  Medicare reassignment NPD
• Beth Israel Deaconess Medical Center, Inc.

  • Ambulance
  • Boston, MA
  • NPI 1518600501
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Melrosewakefield Healthcare, Inc.

  • General Acute Care Hospital
  • Medford, MA
  • NPI 1841290467
  Care Compare affiliation
• The Lowell General Hospital

  dba Lowell General Hospital

  • General Acute Care Hospital
  • Lowell, MA
  • NPI 1407804669
  Care Compare affiliation
• Tufts Medical Center, Inc.

  dba Tufts Medical Center

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1730132515
  Care Compare affiliation
• VHS Acquisition Subsidiary Number 9 Inc

  dba MetroWest Medical Center

  • General Acute Care Hospital
  • Framingham, MA
  • NPI 1740252592
  Care Compare affiliation

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

{
    "created_epoch": "1149120000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1558308213",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "BROOKLINE AVENUE",
            "address_2": "BI DEACONESS MED. CTR - PATH",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02215",
            "telephone_number": "617-667-3648"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "BETH ISRAEL HOSPITAL",
            "address_2": "DEPT OF PATHOLOGY",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02215",
            "telephone_number": "617-667-3648"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HOROWITZ",
        "first_name": "GARY",
        "middle_name": "L",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-01",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207ZP0104X",
            "taxonomy_group": "",
            "desc": "Pathology, Chemical Pathology",
            "state": "MA",
            "license": "44883",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mark Donald Hornstein, MD
• Stefanie Veronica Horoho, RN, MSN, CPNP
• Sherri R Horonjeff, PA
• Brooke Eva Horowitch
• Deborah A Horowitz, LICSW
• Jaime Morgan Horowitz, AUD
• Neil Stuart Horowitz, MD
• Steven Howard Horowitz, MD
• Susan K Horrigan, MA
• Charles R Horsburgh, M.D.

• Chemical Pathology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Chemical Pathology 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.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.