Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William G Stone, MD

Surgery Physician in Sonora, CA · enumerated 2008.

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

National Provider Identifier

1255505764

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Registry record

Entity type Individual (Type 1)

Name William G Stone

Credential MD

Sex Male

Practice address 900 Greenley Rd, Sonora, CA, 95370

Phone (605) 593-3688

Enumeration date Apr 15, 2008

Last updated in NPPES Apr 30, 2022

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 8495 (SD) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License C167208 (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 Stone?

William Stone is registered in NPPES with the primary taxonomy of Surgery 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 2022-04-30.