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

Mr. William Lloyd Horejs Jr., CADP #1601

Addiction (Substance Use Disorder) Counselor in San Diego, CA · enumerated 2018 · practices at Vietnam Veterans of San Diego.

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

National Provider Identifier

1326519992

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Registry record

Entity type Individual (Type 1)

Name Mr. William Lloyd Horejs Jr.

Credential CADP #1601

Sex Male

Practice address San Diego, CA, 92110

Phone (619) 393-2002

Enumeration date Dec 7, 2018

Last updated in NPPES Dec 7, 2018

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 1601 (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

What specialty is William Horejs?

William Horejs is registered in NPPES with the primary taxonomy of Addiction (Substance Use Disorder) Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-12-07.