NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. John Martin Walter, LCSW

Clinical Social Worker in Oakland, CA · enumerated 2007.

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

National Provider Identifier

1629197215

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Mr. John Martin Walter
Credential LCSW
Sex Male
Practice address 1301 Clay St, 270s, Oakland, CA, 94612
Phone (510) 587-5002
Fax (510) 287-2417
Enumeration date Mar 28, 2007
Last updated in NPPES Apr 19, 2012

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License ASW17307 (CA) Secondary
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS 25652 (CA) 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
5830 Other - SFGH INTERNAL USE ONLY
5830 Other - CBHS INTERNAL USE ONLY-COMMERCIAL NUMBER

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

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 John Walter?
John Walter 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 →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-04-19.