Gerald Ross Marx, MD

Primary specialty

Pediatric Cardiology PhysicianTaxonomy code 2080P0202X

License

W7367 Issued in TX

Practice address

300 Longwood Ave
Boston, MA 02115-5724

Phone

(617) 355-0039

NPI assigned

Nov 4, 2005

Last updated

Jun 29, 2026By the provider in NPPES

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 2

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

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Interoperability endpoints

• Direct secure messaging: gmarx26177@direct.bostonchildrens.org

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

• Boston Childrens Heart Foundation Inc

  • Pediatric Cardiology Physician
  • Boston, MA
  • NPI 1982680922
  Medicare reassignment

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

{
    "created_epoch": "1131062400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1782691200000",
    "number": "1063403384",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 9135",
            "address_2": "ATT:SHARON SILVA",
            "city": "BROOKLINE",
            "state": "MA",
            "postal_code": "024469135",
            "telephone_number": "800-927-0002"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "300 LONGWOOD AVE",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021155724",
            "telephone_number": "617-355-0039"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "333 N Santa Rosa",
            "address_purpose": "LOCATION",
            "city": "San Antonio",
            "state": "TX",
            "postal_code": "782073108",
            "country_code": "US",
            "telephone_number": "210-704-3030",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MARX",
        "first_name": "GERALD",
        "middle_name": "ROSS",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-04",
        "last_updated": "2026-06-29",
        "certification_date": "2026-06-29",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0202X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Cardiology",
            "state": "MA",
            "license": "60399",
            "primary": false
        },
        {
            "code": "2080P0202X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Cardiology",
            "state": "TX",
            "license": "W7367",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "GM27010",
            "state": "RI"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3038831",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Marissa Lynn Marvel
• Marvin Behavioral Health Ma PC
• Harleen Kaur Marwah
• Beth S. Marx, LICSW
• Brian Paul Marx, PH.D.
• Mary Nichols, LMHC, LLC
• Paige Catherine Marze
• Charles O Masaki, MBCHB
• Shamik Mascharak, MD
• Nicola Maschietto, MD, PHD

• Pediatric Cardiology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Pediatric Cardiology Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 29, 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.