Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Alejandra Montserrat Sebastian, ASW

Social Worker in Oxnard, CA · enumerated 2015.

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

National Provider Identifier

1861878944

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Registry record

Entity type Individual (Type 1)

Name Mrs. Alejandra Montserrat Sebastian

Credential ASW

Sex Female

Practice address 1911 Williams Dr Ste 210, Oxnard, CA, 93036

Phone (805) 981-4200

Enumeration date Jul 30, 2015

Last updated in NPPES Dec 31, 2024

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

104100000X 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

What specialty is Alejandra Sebastian?

Alejandra Sebastian is registered in NPPES with the primary taxonomy of 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

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Alfredo Bimbela Psychiatric/Mental Health Nurse Practitioner · Oxnard, CA NPI 1982746749 Dina Olivas Clinical Social Worker · Oxnard, CA NPI 1922123710 Cindy Simental Marriage & Family Therapist · Oxnard, CA NPI 1851419535 Chris Castro Marriage & Family Therapist · Oxnard, CA NPI 1619175320 Megan Wright Clinical Social Worker · Oxnard, CA NPI 1356506679 Joni Mahon Clinical Social Worker · Oxnard, CA NPI 1801129069 Germeen Duplessis Social Worker · Oxnard, CA NPI 1740601459 Rosalina Rosales Student in an Organized Health Care Education/Training Program · Oxnard, CA NPI 1194240861

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-12-31.