NPI Portal NPI Lookup & Verification

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

Mr. Lewis Paul Oleson, LCSW

Clinical Social Worker in Davis, CA · enumerated 2007.

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

National Provider Identifier

1558587790

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Registry record

Entity type Individual (Type 1)
Name Mr. Lewis Paul Oleson
Credential LCSW
Sex Male
Practice address Davis, CA, 95616
Phone (530) 756-0555
Fax (530) 756-1368
Enumeration date Apr 17, 2007
Last updated in NPPES Jul 9, 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 LCS13710 (CA) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

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.

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Frequently asked questions

How do I verify Lewis Oleson's NPI record?
Cross-check NPI 1558587790 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1558587790 active?
Yes, as of the latest NPPES snapshot, NPI 1558587790 is active (record last updated 2007-07-09).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.