Cassandra R Duffy, M.D. M.P.H.

Primary specialty

Maternal & Fetal Medicine PhysicianTaxonomy code 207VM0101X

License

278272 Issued in MA

Practice address

330 Brookline Ave
Boston, MA 02215-5400

Phone

(617) 667-2636

NPI assigned

Apr 20, 2012

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

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

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: cduffy251947@direct.bilh.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.

• Beth Israel Deaconess Medical Center, Inc.

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1548202641

  Single Specialty

  Medicare reassignment NPD
• CHMC Surgical Foundation Inc

  • Pediatric Surgery Physician
  • Boston, MA
  • NPI 1902977515

  Single Specialty

  Medicare reassignment NPD
• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

  • Internal Medicine Physician
  • Boston, MA
  • NPI 1194765438

  Single Specialty

  Medicare reassignment NPD
• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

  • Obstetrics & Gynecology Physician
  • Boston, MA
  • NPI 1518908136

  Single Specialty

  Medicare reassignment NPD
• Beth Israel Deaconess Medical Center, Inc.

  • Ambulance
  • Boston, MA
  • NPI 1518600501
  NPD
• Harvard Medical Faculty Phys at Beth Israel Deaconess Med Ctr Inc

  • Emergency Medicine Physician
  • Boston, MA
  • NPI 1316987993

  Single Specialty

  NPD
• Childrens Hospital Boston

  • Children's Hospital
  • Boston, MA
  • NPI 1770741530
  NPD (past)

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

{
    "created_epoch": "1334880000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1763510400000",
    "number": "1770840274",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "8 BELMORE TER APT 1",
            "city": "JAMAICA PLAIN",
            "state": "MA",
            "postal_code": "021304900",
            "telephone_number": "314-703-8759"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "330 BROOKLINE AVE",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "022155400",
            "telephone_number": "617-667-2636"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DUFFY",
        "first_name": "CASSANDRA",
        "middle_name": "R",
        "credential": "M.D. M.P.H.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2012-04-20",
        "last_updated": "2025-11-19",
        "certification_date": "2025-11-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207VM0101X",
            "taxonomy_group": "193400000X SINGLE SPECIALTY  GROUP",
            "desc": "Obstetrics & Gynecology, Maternal & Fetal Medicine",
            "state": "MA",
            "license": "278272",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• David M. Dudzinski, M.D.
• Emily Duff, PHARMD
• Meghan Weake Duffany
• Jeremy Stuart Duffield, M.D. PH.D.
• Alisha M Duffy, NP
• Colette Duffy, LCSW
• Frank H Duffy, MD
• Gerald Duffy Jr.
• Jeanne Frances Duffy, PHD
• Jillian Britt Duffy, MD

• Maternal & Fetal Medicine Physician in Boston, MA
• Providers in Boston, MA by specialty
• Maternal & Fetal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 19, 2025; 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.