Catherine Helen Horwitz, MD

Primary specialty

Emergency Medicine PhysicianTaxonomy code 207P00000X

License

232442 Issued in MA

Practice address

55 Fogg Rd
Weymouth, MA 02190-2432

Phone

(781) 624-8000

NPI assigned

Jul 23, 2007

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Other identifiers 3

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

Emergency Medicine

Education

Tufts University School of Medicine, 2004

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Emergency Physician Associates of Massachusetts PCGroup PAC ID 4981069580, 44 clinicians

Coastal Medical AssociatesGroup PAC ID 7113029257, 443 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Newton-Wellesley Hospital Hospital, Newton, MA, CCN 220101
• South Shore Hospital Hospital, South Weymouth, MA, CCN 220100
• Metrowest Medical Center Hospital, Framingham, MA, CCN 220175

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: horwitz.catherine.nwh@direct.partners.masshiway.net

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.

• Coastal Medical Associates

  • Anesthesiology Physician
  • Weymouth, MA
  • NPI 1932175684
  Medicare reassignment Care Compare group NPD
• Emergency Physician Associates of Massachusetts PC

  • Emergency Medicine Physician
  • Worcester, MA
  • NPI 1730885252
  Medicare reassignment Care Compare group NPD
• Newton Wellesley Emergency Medicine Specialist, P .C.

  • Emergency Medicine Physician
  • Newton, MA
  • NPI 1346355526
  Medicare reassignment NPD
• Steward Emergency Physicians, Inc

  • Emergency Medicine Physician
  • Ayer, MA
  • NPI 1780971275
  Medicare reassignment NPD
• Mass General Brigham Medical Group, Inc.

  • Internal Medicine Physician
  • Salem, NH
  • NPI 1083360200

  MA

  Medicare reassignment NPD
• Newton Wellesley Hospital

  • General Acute Care Hospital
  • Newton, MA
  • NPI 1952845521
  NPD
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  • Multi-Specialty Clinic/Center
  • Boston, MA
  • NPI 1861216038
  NPD (past)
• Associated Physicians of Harvard Medical Faculty Physicians at Beth Is

  • Emergency Medical Services (Emergency Medicine) Physician
  • Boston, MA
  • NPI 1952358533
  NPD (past)
• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

  • Emergency Medicine Physician
  • Boston, MA
  • NPI 1316987993
  NPD (past)

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

• Newton-Wellesley Hospital

  • General Acute Care Hospital
  • Newton, MA
  • NPI 1992737761
  Care Compare affiliation
• South Shore Hospital Inc.

  • General Acute Care Hospital
  • South Weymouth, MA
  • NPI 1134227606
  Care Compare affiliation
• VHS Acquisition Subsidiary Number 9 Inc

  • 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": "1185148800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785888000000",
    "number": "1073713632",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "44 E PLAIN ST",
            "city": "WAYLAND",
            "state": "MA",
            "postal_code": "017784934",
            "telephone_number": "917-626-0377"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FOGG RD",
            "city": "WEYMOUTH",
            "state": "MA",
            "postal_code": "021902432",
            "telephone_number": "781-624-8000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "115 Lincoln St",
            "address_purpose": "LOCATION",
            "city": "Framingham",
            "state": "MA",
            "postal_code": "017026358",
            "country_code": "US",
            "telephone_number": "508-383-1000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HORWITZ",
        "first_name": "CATHERINE",
        "middle_name": "HELEN",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2007-07-23",
        "last_updated": "2026-08-05",
        "certification_date": "2026-08-05",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "MA",
            "license": "232442",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2138760",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HARVARD PILGRIM",
            "identifier": "AA956655",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS",
            "identifier": "J41772",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Phuong Hoang, PA
• Kaci Hoey
• Israela Holtzman, LMHC
• Hopkins Medical Group, LLC
• Patricia T Hopkins, M.D.
• Christine Howe
• Alexa Howell, MS OTR/L
• Lisa Howes
• Kimberly Hsu, M.D.
• Sally Hua, D.M.D

• Emergency Medicine Physician in Weymouth, MA
• Providers in Weymouth, MA by specialty
• Emergency Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 5, 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.