Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Ronald Earl Offenstein, PHD

Psychologist in Riverside, CA · enumerated 2006.

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

National Provider Identifier

1811091978

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Registry record

Entity type Individual (Type 1)

Name Mr. Ronald Earl Offenstein

Credential PHD

Sex Male

Practice address 5887 Brockton Ave, Suite A Riverside Psychiatric Medical Group, Riverside, CA, 92506

Phone (951) 275-8500

Fax (951) 275-8560

Enumeration date Sep 11, 2006

Last updated in NPPES Aug 30, 2012

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY6287 (CA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 Ronald Offenstein?

The National Provider Identifier (NPI) for Ronald Offenstein is 1811091978, a Type 1 (individual) record in the CMS NPPES registry.

Where does Ronald Offenstein practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-08-30.