Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark E Claycomb, LCSW

Psychologist in San Francisco, CA · enumerated 2006.

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

National Provider Identifier

1790791796

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Registry record

Entity type Individual (Type 1)

Name Mark E Claycomb

Credential LCSW

Sex Male

Practice address 55 New Montgomery St, #420, San Francisco, CA, 94105

Phone (415) 522-7400

Fax (445) 543-1932

Enumeration date Jul 31, 2006

Last updated in NPPES Sep 11, 2025

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License LCS135532 (CA) Primary

104100000X Social Worker Behavioral Health & Social Service Providers · License LCS13553 (CA) Secondary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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.

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Frequently asked questions

How do I verify Mark Claycomb's NPI record?

Cross-check NPI 1790791796 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1790791796 active?

Yes, as of the latest NPPES snapshot, NPI 1790791796 is active (record last updated 2025-09-11).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.