Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Maria Carmen Castillo, MSW

Clinical Social Worker in Georgetown, DE · enumerated 2006.

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

National Provider Identifier

1790892701

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Registry record

Entity type Individual (Type 1)

Name Ms. Maria Carmen Castillo

Credential MSW

Sex Female

Practice address 21444 Carmean Way, Georgetown, DE, 19947

Phone (302) 855-1233

Enumeration date Aug 24, 2006

Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 002629 (CT) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License Q1-0001532 (DE) Primary

Other identifiers

Identifier	Type	State	Issuer
Q1-0001532	Other	DE	LCSW

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 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 Maria Castillo?

Maria Castillo is registered in NPPES with the primary taxonomy of Clinical 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 2018-03-17.