Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Cesar Mardones

Clinical Social Worker in Fairfield, CA · enumerated 2007.

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

National Provider Identifier

1578760914

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Cesar Mardones

Sex Male

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

Phone (707) 771-6543

Fax (707) 439-8765

Enumeration date Jun 29, 2007

Last updated in NPPES May 22, 2024

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers · License 26735 (CA) Secondary

104100000X Social Worker Behavioral Health & Social Service Providers Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 6554 (CA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 65554 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Cesar Mardones?

Cesar Mardones 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.

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.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-22.