Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Phyllis Louise Stewart, PH.D.

Clinical Psychologist in Norwalk, CA · enumerated 2006 · practices at Los Angeles County Dept. of Mental Health.

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

National Provider Identifier

1720169873

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Registry record

Entity type Individual (Type 1)

Name Dr. Phyllis Louise Stewart

Credential PH.D.

Sex Female

Practice address 12440 Imperial Hwy, Suite 116, Norwalk, CA, 90650

Phone (626) 229-3587

Enumeration date Oct 17, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PSY8927 (CA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 Phyllis Stewart practice?

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

What is the NPI number for Phyllis Stewart?

The National Provider Identifier (NPI) for Phyllis Stewart is 1720169873, a Type 1 (individual) record in the CMS NPPES registry.

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