Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gary Knowles, OD

Optometrist in Dallas, OR · enumerated 2006 · practices at Polk Vision Clinics Inc..

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

National Provider Identifier

1154364743

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Registry record

Entity type Individual (Type 1)

Name Gary Knowles

Credential OD

Sex Male

Practice address 506 Main St, Dallas, OR, 97338

Phone (503) 623-9233

Fax (503) 623-9233

Enumeration date Jun 13, 2006

Last updated in NPPES Dec 4, 2008

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 1547T (OR) 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
279018	Medicaid	OR	-
0310568863	Other	OR	EYE MED
022775000	Other	OR	BLUE CROSS
7072090	Other	OR	AETNA
93093	Other	OR	LIFEWISE
002118501001	Other	OR	CATERPILLAR
93082710497338	Other	OR	TRICARE
31107	Other	OR	UNITED MEDICAL RESOURCES
93029	Other	OR	PACIFIC SOURCE
O000790187	Other	OR	MUTUAL OF OMAHA

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

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.

What specialty is Gary Knowles?

Gary Knowles 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.

Other providers at this practice address

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Polk Vision Clinics Inc. Optometrist · Dallas, OR NPI 1760669733 Geoffrey Knowles Optometrist · Dallas, OR NPI 1285986513

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-12-04.