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

Janet Kass, LCSW

Clinical Social Worker in Mill Valley, CA · enumerated 2006.

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

National Provider Identifier

1013018647

Verified

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Registry record

Entity type Individual (Type 1)

Name Janet Kass

Credential LCSW

Sex Female

Practice address Mill Valley, CA, 94941

Phone (510) 417-6732

Fax (888) 965-0584

Enumeration date Sep 26, 2006

Last updated in NPPES Jan 16, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License R032617-1 (NY) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Primary

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

Other identifiers

Identifier	Type	State	Issuer
7482980	Other	NY	EMPIRE PLAN
000135468	Other	NY	EXCELLUS BLUE CROSS

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

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.

What specialty is Janet Kass?

Janet Kass is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-16.