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

Theresa Treadwell, NP

Family Nurse Practitioner in Azusa, CA · enumerated 2014.

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

National Provider Identifier

1437551462

Verified

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Registry record

Entity type Individual (Type 1)

Name Theresa Treadwell

Credential NP

Sex Female

Practice address Azusa, CA, 91702

Phone (626) 234-6172

Enumeration date Sep 22, 2014

Last updated in NPPES Sep 22, 2014

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

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95001373 (CA) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP 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 Theresa Treadwell?

The National Provider Identifier (NPI) for Theresa Treadwell is 1437551462, a Type 1 (individual) record in the CMS NPPES registry.

Where does Theresa Treadwell practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-09-22.