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

Dr. Catherine Mary O'Sullivan, PSYD

Psychologist in Ridgewood, NJ · enumerated 2013.

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

National Provider Identifier

1427481027

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Catherine Mary O'Sullivan

Credential PSYD

Sex Female

Practice address Ridgewood, NJ, 07450

Phone (845) 416-7839

Enumeration date Aug 19, 2013

Last updated in NPPES Apr 5, 2016

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

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 35SI00550000 (NJ) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 35SI00550000 (NJ) Primary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 35SI00550000 (NJ) Secondary

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License 021138 (NY) Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License 021138 (NY) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 021138 (NY) Secondary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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 Catherine O'Sullivan practice?

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

What is the NPI number for Catherine O'Sullivan?

The National Provider Identifier (NPI) for Catherine O'Sullivan is 1427481027, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-04-05.