Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory Scott Wingren, O.D.

Optometrist in Napa, CA · enumerated 2013.

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

National Provider Identifier

1164857140

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Scott Wingren

Credential O.D.

Sex Male

Practice address 895 Trancas St, Napa, CA, 94558

Phone (707) 252-2020

Fax (707) 252-0329

Enumeration date Sep 9, 2013

Last updated in NPPES Feb 24, 2014

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 14767 (CA) Primary

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

Gregory Wingren 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 2014-02-24.