Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Mariela Castellano-Arredondo

School Counselor in San Marcos, CA · enumerated 2026.

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

National Provider Identifier

1306705223

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Registry record

Entity type Individual (Type 1)

Name Mrs. Mariela Castellano-Arredondo

Sex Female

Practice address 255 Pico Ave Ste 250, San Marcos, CA, 92069

Phone (760) 290-2512

Enumeration date Jan 16, 2026

Last updated in NPPES Jan 16, 2026

Taxonomy & licenses

101YS0200X School Counselor Behavioral Health & Social Service Providers · License 230119541 (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

Is NPI 1306705223 active?

Yes, as of the latest NPPES snapshot, NPI 1306705223 is active (record last updated 2026-01-16).

How do I verify Mariela Castellano-Arredondo's NPI record?

Cross-check NPI 1306705223 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

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Michelle Atkins School Social Worker · San Marcos, CA NPI 1881901221 Rosa Felix School Counselor · San Marcos, CA NPI 1508724782 Cara Mclean Licensed Vocational Nurse · San Marcos, CA NPI 1699624395 Rachel Sterner School Registered Nurse · San Marcos, CA NPI 1366395063 Claudia Hernandez Health & Wellness Coach · San Marcos, CA NPI 1649127291 Traci Molloy Health & Wellness Coach · San Marcos, CA NPI 1720935372 Elisabeth Lawson-Abreu School Registered Nurse · San Marcos, CA NPI 1396679189

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