Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Lina Sierra Castillo

Social Worker in Gaithersburg, MD · enumerated 2021.

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

National Provider Identifier

1598425449

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Registry record

Entity type Individual (Type 1)

Name Lina Sierra Castillo

Sex Female

Practice address 620 E Diamond Ave Ste H, Gaithersburg, MD, 20877

Phone (301) 840-3200

Enumeration date Dec 20, 2021

Last updated in NPPES Jan 11, 2022

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.

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Frequently asked questions

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.

What specialty is Lina Sierra Castillo?

Lina Sierra Castillo 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-11.