Thomas Jonathan Malcolm, PH.D.

Thomas Jonathan Malcolm is a Clinical Psychologist provider (Psychologist) practicing in Glendora, CA, registered in the NPPES registry with NPI 1528083953 since 2006. The credential PHD stands for Doctor of Philosophy. Practices at Vrabel Psychological Services Inc. (listed at the same practice address in NPPES).

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1528083953
Entity type	Individual (Type 1)
Name	Thomas Jonathan Malcolm
Credential	PH.D.
Sex	Male
Practice address	Glendora, CA, 91741
Phone	6263352466
Fax	6263359686
Enumeration date	2006-07-13
Last updated in NPPES	2009-01-14

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

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
103TC0700X	Clinical Psychologist	Primary	PSY4156	CA

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
00PL41560	Medicaid	CA	—

Copy-ready billing details

Provider: Thomas Malcolm, PH.D.
NPI: 1528083953
Taxonomy: 103TC0700X (Clinical Psychologist)
Address: Glendora, CA, 91741

Other providers at this practice address

NPI	Name	Type	Specialty	Location
1235162652	Vrabel Psychological Services Inc.	Organization	Clinical Psychologist	Glendora, CA

Verify this record

Cross-check NPI 1528083953 against the authoritative CMS record: view Thomas Jonathan Malcolm on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Thomas Malcolm?

Thomas Malcolm is registered in NPPES with the primary taxonomy of Clinical Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2009-01-14.