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

Dr. William John Ernst, PSY.D.

Clinical Neuropsychologist in Freehold, NJ · enumerated 2007.

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

National Provider Identifier

1780892166

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Registry record

Entity type Individual (Type 1)
Name Dr. William John Ernst
Credential PSY.D.
Sex Male
Practice address Freehold, NJ, 07728
Phone (215) 262-0741
Fax (609) 424-3164
Enumeration date May 18, 2007
Last updated in NPPES Dec 28, 2010

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 35SI00409100 (NJ) Primary
103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License PS015223 (PA) 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.

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Frequently asked questions

How do I verify William Ernst's NPI record?
Cross-check NPI 1780892166 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1780892166 active?
Yes, as of the latest NPPES snapshot, NPI 1780892166 is active (record last updated 2010-12-28).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-28.