Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Robert Cecil Williams, PT

Physical Therapist in Corralitos, CA · enumerated 2023.

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

National Provider Identifier

1801678651

Verified

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Registry record

Entity type Individual (Type 1)

Name Robert Cecil Williams

Credential PT

Sex Male

Practice address Corralitos, CA, 95076

Phone (831) 234-6968

Enumeration date Oct 17, 2023

Last updated in NPPES Oct 17, 2023

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

225100000X Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 7228 (CA) Primary

PT · Physical Therapist: A licensed movement specialist treating injury and disability through exercise and rehabilitation. About the PT 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

Where does Robert Williams practice?

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

What is the NPI number for Robert Williams?

The National Provider Identifier (NPI) for Robert Williams is 1801678651, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-10-17.