Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Efren Monterroso Jr.

Social Worker in Sylmar, CA · enumerated 2014.

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

National Provider Identifier

1982002044

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Registry record

Entity type Individual (Type 1)

Name Efren Monterroso Jr.

Sex Male

Practice address 11300 Foothill Blvd Unit 78, Sylmar, CA, 91342

Phone (818) 899-4954

Enumeration date Dec 5, 2014

Last updated in NPPES Dec 5, 2014

Taxonomy & licenses

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 Efren Monterroso?

Efren Monterroso 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-12-05.