Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Viviane Geraldine Winthrop, DDS

Dentist in Atascadero, CA · enumerated 2006.

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

National Provider Identifier

1538185186

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Registry record

Entity type Individual (Type 1)

Name Dr. Viviane Geraldine Winthrop

Credential DDS

Sex Female

Practice address 10333 El Camino Real, Atascadero, CA, 93422

Phone (805) 468-2000

Enumeration date Jul 15, 2006

Last updated in NPPES Jun 18, 2019

Taxonomy & licenses

122300000X Dentist Dental Providers · License D5839 (AZ) Secondary

122300000X Dentist Dental Providers · License 44641 (CA) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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 is the NPI number for Viviane Winthrop?

The National Provider Identifier (NPI) for Viviane Winthrop is 1538185186, a Type 1 (individual) record in the CMS NPPES registry.

Where does Viviane Winthrop practice?

The practice location on file with NPPES is in Atascadero, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-18.