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

Dr. Marc I Oster, PSY.D.

Psychologist in Deerfield, IL · enumerated 2007.

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

National Provider Identifier

1114069093

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Registry record

Entity type Individual (Type 1)
Name Dr. Marc I Oster
Credential PSY.D.
Sex Male
Practice address Deerfield, IL, 60015
Phone (847) 604-1593
Fax (847) 579-1055
Enumeration date Feb 13, 2007
Last updated in NPPES Sep 11, 2025

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 Secondary
103TH0100X Health Service Psychologist Behavioral Health & Social Service Providers Secondary
103T00000X Psychologist Behavioral Health & Social Service Providers Primary
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

Where does Marc Oster practice?
The practice location on file with NPPES is in Deerfield, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Marc Oster?
The National Provider Identifier (NPI) for Marc Oster is 1114069093, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.