NPI Portal NPI Lookup & Verification

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

Dr. Darren William Holowka, PH.D.

Clinical Psychologist in East Providence, RI · enumerated 2012 · practices at Trident Psychological Services.

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

National Provider Identifier

1104187251

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. Darren William Holowka
Credential PH.D.
Sex Male
Practice address East Providence, RI, 02914
Phone (401) 450-0729
Fax (401) 537-1830
Enumeration date Jun 6, 2012
Last updated in NPPES Nov 22, 2023

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

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PS01423 (RI) Primary
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
9490 Other MA PROFESSIONAL LICENSE
PS01423 Other RI PROFESSIONAL LICENSE

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 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 Darren Holowka?
Darren Holowka 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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-11-22.