Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Rene S. Mesa, MSW

Social Worker in Fairfield, CA · enumerated 2013.

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

National Provider Identifier

1861838898

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Registry record

Entity type Individual (Type 1)

Name Mr. Rene S. Mesa

Credential MSW

Sex Male

Practice address 2420 Martin Rd Ste 200, Fairfield, CA, 94534

Phone (707) 399-4520

Fax (707) 399-4521

Enumeration date May 16, 2013

Last updated in NPPES Jun 5, 2024

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers · License 116835 (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.

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Frequently asked questions

How do I verify Rene Mesa's NPI record?

Cross-check NPI 1861838898 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1861838898 active?

Yes, as of the latest NPPES snapshot, NPI 1861838898 is active (record last updated 2024-06-05).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-06-05.