Loren David Walensky, MD PHD

Primary specialty

Pediatric Hematology & Oncology PhysicianTaxonomy code 2080P0207X

License

204839 Issued in MA

Practice address

300 Longwood Ave
Boston, MA 02115-5724

Phone

(617) 355-6000

NPI assigned

Jul 3, 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 7

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, Doctor of Philosophy

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: walensky.loren.dfci@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.

• Children's Hospital Pediatric Associates, Inc

  • Pediatrics Physician
  • Boston, MA
  • NPI 1457306664

  Pediatric Hematology-Oncology

  Medicare reassignment NPD
• Dana-Farber Cancer Institute, Inc.

  dba Dana-Farber Cancer Institute

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1851333686
  Medicare reassignment NPD
• Dana-Farber Cancer Institute, Inc.

  dba Binney Medical Associates

  • Special Hospital
  • Boston, MA
  • NPI 1346433257
  NPD
• Dana-Farber Cancer Institute, Inc.

  dba The Friends' Place

  • Durable Medical Equipment & Medical Supplies
  • Chestnut Hill, MA
  • NPI 1497429237
  NPD
• Children's Hospital Corporation

  dba Boston Children's Hospital

  • Children's Hospital
  • Boston, MA
  • NPI 1710087127
  NPD (past)

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

{
    "created_epoch": "1151884800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1779062400000",
    "number": "1508896853",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "300 LONGWOOD AVE",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "021155724",
            "telephone_number": "617-355-6000"
        },
        {
            "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": "617-355-6000"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "450 Brookline Ave",
            "address_purpose": "LOCATION",
            "city": "Boston",
            "state": "MA",
            "postal_code": "022155450",
            "country_code": "US",
            "telephone_number": "617-632-3274",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "WALENSKY",
        "first_name": "LOREN",
        "middle_name": "DAVID",
        "name_prefix": "Dr.",
        "credential": "MD PHD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-03",
        "last_updated": "2026-05-18",
        "certification_date": "2026-05-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0207X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Hematology-Oncology",
            "state": "MA",
            "license": "204839",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "CIGNA",
            "identifier": "7493680",
            "state": null
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "FALLON COMMUNITY HEALTH",
            "identifier": "1160345",
            "state": null
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "2000971",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TUFTS",
            "identifier": "204839",
            "state": null
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BMC HEALTHNET",
            "identifier": "000000029367",
            "state": null
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS BLUE SHIELD OF",
            "identifier": "J25849",
            "state": "MA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HPHC",
            "identifier": "206434",
            "state": null
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Cheryl D Waldron, ACNP
• Elizabeth Mary Waldron, PHD
• Jamie Waldron, M.D.
• Jonathan Waldstreicher, MD
• Erin Walecka, MS, OTR/L
• Rochelle Walensky, MD
• Andrew Walfield, PA-C
• Geoffrey Andrew Walford, M.D.
• Michael Mel Walger, MD
• Walgreen Co (Walgreens #15468)

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

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 18, 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.