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

Dr. Eric John Niemeyer, PSY. D.

Clinical Psychologist in Vacaville, CA · enumerated 2008.

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

National Provider Identifier

1154584894

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Registry record

Entity type Individual (Type 1)

Name Dr. Eric John Niemeyer

Credential PSY. D.

Sex Male

Practice address Vacaville, CA, 95688

Phone (707) 624-7500

Fax (707) 624-7501

Enumeration date Jul 2, 2008

Last updated in NPPES Dec 8, 2022

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

Taxonomy & licenses

103TA0400X Addiction (Substance Use Disorder) Psychologist Behavioral Health & Social Service Providers Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 25842 (CA) Primary

103TH0100X Health Service Psychologist Behavioral Health & Social Service Providers 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

What is the NPI number for Eric Niemeyer?

The National Provider Identifier (NPI) for Eric Niemeyer is 1154584894, a Type 1 (individual) record in the CMS NPPES registry.

Where does Eric Niemeyer practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-08.