Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Shannon F. Williamson, ASW

Counselor in San Francisco, CA · enumerated 2006.

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

National Provider Identifier

1235294471

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. Shannon F. Williamson

Credential ASW

Sex Male

Practice address 673 San Jose Ave, San Francisco, CA, 94110

Phone (415) 282-3789

Enumeration date Dec 27, 2006

Last updated in NPPES Jan 7, 2022

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 97075 (CA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 63933 (CA) Secondary

101Y00000X Counselor Behavioral Health & Social Service Providers · License 97075 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Shannon Williamson practice?

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

What is the NPI number for Shannon Williamson?

The National Provider Identifier (NPI) for Shannon Williamson is 1235294471, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-07.