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

Sidney Gene Stephens Jr., SUDRC

Addiction (Substance Use Disorder) Counselor in Castro Valley, CA · enumerated 2025 · practices at Horizon Services, Inc.

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

National Provider Identifier

1255129243

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Registry record

Entity type Individual (Type 1)

Name Sidney Gene Stephens Jr.

Credential SUDRC

Sex Male

Practice address Castro Valley, CA, 94578

Phone (510) 346-7836

Enumeration date Apr 29, 2025

Last updated in NPPES Apr 29, 2025

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

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 21270 (CA) Primary

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 Sidney Stephens practice?

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

What is the NPI number for Sidney Stephens?

The National Provider Identifier (NPI) for Sidney Stephens is 1255129243, 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 2025-04-29.