William Alian Walker, MD

Primary specialty

Pediatric Gastroenterology PhysicianTaxonomy code 2080P0206X

License

31989 Issued in MA

Practice address

55 Fruit Street B114 3501
Massachusetts General Hospital
Boston, MA 02114

Phone

(617) 726-7988

Fax

(617) 724-1731

NPI assigned

Jan 13, 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

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

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

{
    "created_epoch": "1137110400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1144209446",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 9142",
            "address_2": "MASS GENERAL PHYSICIAN ORGANIZATION",
            "city": "CHARLESTOWN",
            "state": "MA",
            "postal_code": "021299142",
            "telephone_number": "617-724-0287",
            "fax_number": "917-726-2894"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "55 FRUIT STREET B114 3501",
            "address_2": "MASSACHUSETTS GENERAL HOSPITAL",
            "city": "BOSTON",
            "state": "MA",
            "postal_code": "02114",
            "telephone_number": "617-726-7988",
            "fax_number": "617-724-1731"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WALKER",
        "first_name": "WILLIAM",
        "middle_name": "ALIAN",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-01-13",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2080P0206X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Pediatric Gastroenterology",
            "state": "MA",
            "license": "31989",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Robert Leo Walker III, MD
• Shyne T Walker, CNA
• Suzanne Levy Walker, MSW
• Thomas Gregory Walker, M.D.
• Tiana Walker, MD
• Zachary Wendell Walker
• Stacey Walketr
• Jenifer Lin Walkowiak, PH.D.
• Stephanie Ann Walkup, AU.D.
• Alexandra N Wall, FNP

• Pediatric Gastroenterology Physician in Boston, MA
• Providers in Boston, MA by specialty
• Pediatric Gastroenterology 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.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.