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Dr. William F Tong, M.D.

General Practice Physician in Watsonville, CA · enumerated 2005 · practices at Watsonville Doctors on Duty.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1457354110

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Registry record

Entity type Individual (Type 1)
Name Dr. William F Tong
Credential M.D.
Sex Male
Practice address 1505 Main St, Watsonville, CA, 95076
Phone (831) 722-1444
Fax (831) 722-4414
Enumeration date May 24, 2005
Last updated in NPPES Feb 8, 2010

Taxonomy & licenses

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License G43285 (CA) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is William Tong?
William Tong is registered in NPPES with the primary taxonomy of General Practice Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-08.