Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Robert S. Weiss
Clinical Social Worker in Napa, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1841480233
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Registry record
Entity type Individual (Type 1)
Name Robert S. Weiss
Sex Male
Practice address 1272 Hayes St, Napa, CA, 94559
Phone (707) 346-4294
Fax (707) 710-9511
Enumeration date Jul 31, 2007
Last updated in NPPES Mar 6, 2025
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS 19316 (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.
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 Robert Weiss?
Robert Weiss 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.
Other providers at this practice address
Browse all → Adriana Martinez-Chavez Clinical Social Worker · Napa, CA NPI 1386794238 Ann Tommaney Psychologist · Napa, CA NPI 1922217496 Monica Haigh Marriage & Family Therapist · Napa, CA NPI 1336446277 Arlene Dunkelberger Marriage & Family Therapist · Napa, CA NPI 1588072920 Karina Arias Marriage & Family Therapist · Napa, CA NPI 1972058220 Maria Avina Ramos Marriage & Family Therapist · Napa, CA NPI 1679071708 Lisa Davison Mental Health Counselor · Napa, CA NPI 1154823714 Mackenzie Lovie Clinical Social Worker · Napa, CA NPI 1427550102
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-06.