Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William D Horton, PSY D

Psychologist in San Francisco, CA · enumerated 2011.

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

National Provider Identifier

1215205547

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Registry record

Entity type Individual (Type 1)

Name William D Horton

Credential PSY D

Sex Male

Practice address 580 California St Fl 12, San Francisco, CA, 94104

Phone (941) 408-8551

Fax (941) 408-8552

Enumeration date Dec 1, 2011

Last updated in NPPES Jul 18, 2024

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License LPY11 (FL) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY16088 (CA) 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1215205547 active?

Yes, as of the latest NPPES snapshot, NPI 1215205547 is active (record last updated 2024-07-18).

How do I verify William Horton's NPI record?

Cross-check NPI 1215205547 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-07-18.