Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Marianna Singwi-Ferrono
School Social Worker in Oakland, CA · enumerated 2026.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1164389581
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Registry record
Entity type Individual (Type 1)
Name Marianna Singwi-Ferrono
Sex Female
Practice address 4521 Webster St, Oakland, CA, 94609
Phone (510) 879-1353
Enumeration date Jan 7, 2026
Last updated in NPPES Jan 7, 2026
Taxonomy & licenses
1041S0200X School Social Worker Behavioral Health & Social Service Providers · License 104367 (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 Marianna Singwi-Ferrono?
Marianna Singwi-Ferrono is registered in NPPES with the primary taxonomy of School 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 → Asian Community Mental Health Board Community/Behavioral Health Agency · Oakland, CA NPI 1669787735 Center for Empowering Refugees and Immigrants Community/Behavioral Health Agency · Oakland, CA NPI 1922306455 The Alliance for Community Wellness Community/Behavioral Health Agency · Oakland, CA NPI 1558807230 Jizabel Navarrete School Counselor · Oakland, CA NPI 1255298675 Lucinda Matias Mendoza Health & Wellness Coach · Oakland, CA NPI 1639008345 Rosa Ayala Health & Wellness Coach · Oakland, CA NPI 1205767514
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-07.