Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

John Joseph Costello, LCSW

Clinical Social Worker in New Milford, CT · enumerated 2024.

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

National Provider Identifier

1942020045

Verified

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Registry record

Entity type Individual (Type 1)

Name John Joseph Costello

Credential LCSW

Sex Male

Practice address New Milford, CT, 06776

Phone (707) 738-0298

Enumeration date Oct 14, 2024

Last updated in NPPES Oct 14, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 096713 (NY) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 14502 (CT) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

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

Where does John Costello practice?

The practice location on file with NPPES is in New Milford, CT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for John Costello?

The National Provider Identifier (NPI) for John Costello is 1942020045, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-10-14.