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

Martha Fair Williams, P.T.

Physical Therapist in Vacaville, CA · enumerated 2006 · practices at Precision Orthotic Prosthetic Solutions.

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

National Provider Identifier

1689748451

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Registry record

Entity type Individual (Type 1)

Name Martha Fair Williams

Credential P.T.

Sex Female

Practice address Vacaville, CA, 95688

Phone (707) 447-9750

Fax (707) 447-9220

Enumeration date Nov 20, 2006

Last updated in NPPES Jul 8, 2007

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 PT9761 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
PT0097610	Medicaid	CA	-

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 NPI 1689748451 active?

Yes, as of the latest NPPES snapshot, NPI 1689748451 is active (record last updated 2007-07-08).

How do I verify Martha Williams's NPI record?

Cross-check NPI 1689748451 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Laurie Salvi Physical Therapist · Vacaville, CA NPI 1487715769 Precision Orthotic Prosthetic Solutions Specialist · Vacaville, CA NPI 1730222498 Leanna Aho Physical Therapist · Vacaville, CA NPI 1699959056 Joan Case Orthopedic Physical Therapist · Vacaville, CA NPI 1467694232 Meghann Oakes Physical Therapist · Vacaville, CA NPI 1528312063 Katherine Voepel Ward Physical Therapist · Vacaville, CA NPI 1558775965 Drew Thompson Orthopedic Physical Therapist · Vacaville, CA NPI 1083019236 Nicole Armstrong Physical Therapist · Vacaville, CA NPI 1881087880

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.