Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William V Cheslock, OD

Optometrist in Longview, WA · enumerated 2006.

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

National Provider Identifier

1649368200

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Registry record

Entity type Individual (Type 1)

Name Dr. William V Cheslock

Credential OD

Sex Male

Practice address 950 11th Ave, Longview, WA, 98632

Phone (360) 577-1500

Fax (360) 577-0735

Enumeration date Oct 10, 2006

Last updated in NPPES Jul 15, 2009

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OD00001352 (WA) Primary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

Other identifiers

Identifier	Type	State	Issuer
1010262	Other	WA	COMMUNITY HEALTH PLAN
410047498	Other	WA	RAILROAD MEDICARE
CH3006	Other	WA	REGENCE BLUE CROSS
0117286	Other	WA	LABOR & INDUSTRIES
2010593	Medicaid	WA	-
410047498	Other	WA	MEDICARE RAILROAD CARRIER
020490001	Other	WA	OREGON REGENCE

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.

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Frequently asked questions

What specialty is William Cheslock?

William Cheslock is registered in NPPES with the primary taxonomy of Optometrist. 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 2009-07-15.