Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Chelsey Mills

School Social Worker in San Marcos, CA · enumerated 2026.

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

National Provider Identifier

1609735729

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Registry record

Entity type Individual (Type 1)

Name Chelsey Mills

Sex Female

Practice address 1615 Schoolhouse Way, San Marcos, CA, 92078

Phone (760) 290-2600

Enumeration date Jan 16, 2026

Last updated in NPPES Jan 16, 2026

Taxonomy & licenses

1041S0200X School Social Worker Behavioral Health & Social Service Providers 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

Where does Chelsey Mills practice?

The practice location on file with NPPES is in San Marcos, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Chelsey Mills?

The National Provider Identifier (NPI) for Chelsey Mills is 1609735729, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-01-16.