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

Katharine Ruth Diaz, PT

Physical Medicine & Rehabilitation Physician in Amarillo, TX · enumerated 2018.

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

National Provider Identifier

1336622042

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Registry record

Entity type Individual (Type 1)

Name Katharine Ruth Diaz

Credential PT

Sex Female

Practice address Amarillo, TX, 79106

Phone (806) 354-1000

Enumeration date Sep 9, 2018

Last updated in NPPES Sep 9, 2018

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

Taxonomy & licenses

208100000X Physical Medicine & Rehabilitation Physician Allopathic & Osteopathic Physicians · License 1037778 (TX) 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

What is the NPI number for Katharine Diaz?

The National Provider Identifier (NPI) for Katharine Diaz is 1336622042, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katharine Diaz practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-09.