Leonard I Zon, MD

Primary specialty

Hematology & Oncology PhysicianTaxonomy code 207RH0003X

License

55881 Issued in MA

Practice address

300 Longwood Ave
Research Building Floor 7
Boston, MA 02115-5724

Phone

(617) 919-2069

NPI assigned

Mar 20, 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

Other identifiers 1

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

Hematology/Oncology

Education

Jefferson Medical College of Thomas Jefferson University, 1983

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: lzon25862@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 and National Provider Directory roles.

• Children'S Hospital Pediatric Associates, Inc

  • Pediatrics Physician
  • Boston, MA
  • NPI 1457306664
  Medicare reassignment NPD

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

{
    "created_epoch": "1142812800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1245299197",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "6 FROST CIR",
            "city": "WELLESLEY",
            "state": "MA",
            "postal_code": "024822336",
            "telephone_number": "781-431-9123"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "300 LONGWOOD AVE",
            "address_2": "RESEARCH BUILDING FLOOR 7",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021155724",
            "telephone_number": "617-919-2069"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "ZON",
        "first_name": "LEONARD",
        "middle_name": "I",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-20",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "MA",
            "license": "55881",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3069590",
            "state": "MA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Bence Adam Zolyomi, MD
• Katherine Zombeck, RN, CRNA
• Katherine I Zombik
• Kayla Zomlefer, MD
• Heidi Sue Zommer, PT
• Rebecca Zon, MD
• Lijia Zong
• Mary Elizabeth Zook, N.P.
• Ashley Harrington Zoppo, M.D.
• Arianne Zorn, FNP

• Hematology & Oncology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Hematology & Oncology 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.