NPI Portal NPI Lookup & Verification

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Mr. John William Kniffin, L.C.S.W.

Social Worker in Oakland, CA · enumerated 2007 · practices at Alameda County.

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

National Provider Identifier

1336350008

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Registry record

Entity type Individual (Type 1)
Name Mr. John William Kniffin
Credential L.C.S.W.
Sex Male
Practice address 7200 Bancroft Ave Ste 125a, Oakland, CA, 94605
Phone (510) 777-3814
Fax (510) 777-3806
Enumeration date May 24, 2007
Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License LCS 20080 (CA) Primary
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

What specialty is John Kniffin?
John Kniffin is registered in NPPES with the primary taxonomy of Social Worker. 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 2007-07-08.