Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. WILLIAM ALIAN WALKER MD
NPI 1144209446
Pediatrics - Pediatric Gastroenterology in Boston, MA

Q: What is William Walker's NPI number?

The NPI number for William Walker is 1144209446. It was assigned to this individual provider in the NPPES registry on January 13, 2006.

Q: What is William Walker's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.

Q: When was this NPI record last updated?

The NPPES record for William Walker was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 44 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since January 13, 2006

55 FRUIT STREET B114 3501, MASSACHUSETTS GENERAL HOSPITAL, BOSTON, MA 02114(617) 726-7988(617) 724-1731 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 23, 2026.

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About Dr. William Alian Walker Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM ALIAN WALKER MD (NPI 1144209446) is an individual pediatric gastroenterology provider in Boston, Massachusetts, licensed in Massachusetts (31989) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1144209446

Entity TypeIndividualMale

Primary Taxonomy2080P0206X

Provider Legal NameDR. WILLIAM ALIAN WALKERCredential: MD

Location Address55 FRUIT STREET B114 3501, MASSACHUSETTS GENERAL HOSPITALBoston, MA 02114

Mailing AddressPo Box 9142, Mass General Physician OrganizationCharlestown, MA 02129-9142 · (617) 724-0287 · Fax (917) 726-2894

Phone(617) 726-7988

Fax(617) 724-1731

Sole ProprietorNo

Enumeration DateJanuary 13, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1144209446 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric GastroenterologyAllopathic & Osteopathic Physicians

Taxonomy Code2080P0206X

License✔ Licensed in MA · 31989

Definition

A pediatrician who specializes in the diagnosis and treatment of diseases of the digestive systems of infants, children and adolescents. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using lighted scopes to see internal organs.

55 FRUIT STREET B114 3501, Boston, MA 02114

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Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Walker's NPI number?

The NPI number for William Walker is 1144209446. It was assigned to this individual provider in the NPPES registry on January 13, 2006.

Where is William Walker located?

William Walker practices at 55 Fruit Street B114 3501 Massachusetts General Hospital, Boston, MA 02114. The listed phone number is (617) 726-7988.

What is William Walker's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Gastroenterology, with taxonomy code 2080P0206X.

When was this NPI record last updated?

The NPPES record for William Walker was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 44 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.