Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Dennis John Ritchie, MSW, PH.D.

Clinical Social Worker in Cathedral City, CA · enumerated 2025.

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

National Provider Identifier

1851106561

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Registry record

Entity type Individual (Type 1)

Name Dr. Dennis John Ritchie

Credential MSW, PH.D.

Sex Male

Practice address 34462 Paseo Real, Cathedral City, CA, 92234

Phone (703) 944-1673

Enumeration date Feb 10, 2025

Last updated in NPPES Feb 10, 2025

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 121177 (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

Where does Dennis Ritchie practice?

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

What is the NPI number for Dennis Ritchie?

The National Provider Identifier (NPI) for Dennis Ritchie is 1851106561, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-10.