Nancy C Haff, MD

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

269993 Issued in MA

Practice address

70 Hastings St Ste 200
Wellesley, MA 02481-5439

Phone

(781) 772-8600

Fax

(781) 772-5600

NPI assigned

Jun 9, 2014

Last updated

Jan 9, 2026By the provider in NPPES

Sex

Female

Sole proprietor

No

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

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: haff.nancy.mgh@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, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• Massachusetts General Physicians Organization Inc

  • Dermatology Physician
  • Boston, MA
  • NPI 1801874573

  Internal Medicine

  Medicare reassignment NPD
• Private Health Care Group, LLC

  • Internal Medicine Physician
  • Wellesley, MA
  • NPI 1053680108
  Medicare reassignment NPD
• The General Hospital Corporation

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1023049236
  Medicare reassignment NPD
• General Hospital Corp

  dba Massachusetts General Hospital Outpatient Pharmacy

  • General Acute Care Hospital
  • Boston, MA
  • NPI 1508390014
  NPD

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

{
    "created_epoch": "1402272000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767916800000",
    "number": "1922411867",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "70 HASTINGS ST STE 200",
            "city": "WELLESLEY",
            "state": "MA",
            "postal_code": "024815439",
            "telephone_number": "781-772-8600",
            "fax_number": "781-772-5600"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "70 HASTINGS ST STE 200",
            "city": "WELLESLEY",
            "state": "MA",
            "postal_code": "024815439",
            "telephone_number": "781-772-8600",
            "fax_number": "781-772-5600"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HAFF",
        "first_name": "NANCY",
        "middle_name": "C",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2014-06-09",
        "last_updated": "2026-01-09",
        "certification_date": "2026-01-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MA",
            "license": "269993",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Guan Yin Healing Home
• Carl Gustafson, PT
• Jeanned'Arc Haddad, RD
• Jameila Y Haddawi, M.D.
• Deborah Hadley, M.D.
• Claudia Haime, CCC-A
• Burt Whitney Hall, MD
• Jamie Hall
• Kathryn E Hall, NP
• Elizabeth Ham, NP

• Internal Medicine Physician in Wellesley, MA
• Providers in Wellesley, MA by specialty
• Internal Medicine Physician in Massachusetts

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 9, 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.