Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Lester Howard Wielstein, CCSW
Social Worker in Fair Oaks, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1568565539
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Mr. Lester Howard Wielstein
Credential CCSW
Sex Male
Practice address 5150 Sunrise Blvd Ste G5g6, Fair Oaks, CA, 95628
Phone (916) 607-6108
Fax (916) 638-1734
Enumeration date Sep 6, 2006
Last updated in NPPES Jun 7, 2020
Taxonomy & licenses
104100000X Social Worker Behavioral Health & Social Service Providers · License LCS11320 (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 Lester Wielstein?
Lester Wielstein is registered in NPPES with the primary taxonomy of 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 2020-06-07.