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

Susan Rotwein Zweig, M.A.

Q: What is the NPI number for Susan Zweig?

The National Provider Identifier (NPI) for Susan Zweig is 1619194651, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Social Worker in Los Altos, CA · enumerated 2007.

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

National Provider Identifier

1619194651

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Registry record

Entity type Individual (Type 1)

Name Susan Rotwein Zweig

Credential M.A.

Sex Female

Practice address Los Altos, CA, 94022

Phone (650) 949-4221

Enumeration date Apr 19, 2007

Last updated in NPPES Jul 8, 2007

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS 8031 (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 Susan Zweig practice?

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

What is the NPI number for Susan Zweig?

The National Provider Identifier (NPI) for Susan Zweig is 1619194651, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Sharon Levin Clinical Social Worker · Los Altos, CA NPI 1962925867

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.