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

Dr. Barbara M Maxwell, PHD

Health Service Psychologist in Phoenix, AZ · enumerated 2007.

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

National Provider Identifier

1528109139

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Registry record

Entity type Individual (Type 1)

Name Dr. Barbara M Maxwell

Credential PHD

Sex Female

Practice address Phoenix, AZ, 85020

Phone (480) 246-7332

Fax (602) 262-2223

Enumeration date Feb 8, 2007

Last updated in NPPES May 19, 2015

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

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3540 (AZ) Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 3540 (AZ) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 3540 (AZ) Secondary

103TH0100X Health Service Psychologist Behavioral Health & Social Service Providers · License 3540 (AZ) Primary

103TR0400X Rehabilitation Psychologist Behavioral Health & Social Service Providers · License 3540 (AZ) Secondary

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

Other identifiers

Identifier	Type	State	Issuer
876732	Medicaid	AZ	-

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

Is NPI 1528109139 active?

Yes, as of the latest NPPES snapshot, NPI 1528109139 is active (record last updated 2015-05-19).

How do I verify Barbara Maxwell's NPI record?

Cross-check NPI 1528109139 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-05-19.