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

Mrs. Barbara B Markowitz, LCSW

Clinical Social Worker in Merrick, NY · enumerated 2007 · practices at Counseling & Psychological Services for the Individual, Family, Group,.

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

National Provider Identifier

1255452504

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Registry record

Entity type Individual (Type 1)

Name Mrs. Barbara B Markowitz

Credential LCSW

Sex Female

Practice address Merrick, NY, 11566

Phone (516) 377-4054

Fax (516) 377-4054

Enumeration date Apr 3, 2007

Last updated in NPPES Aug 22, 2012

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 R019597 (NY) Primary

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

Other identifiers

Identifier	Type	State	Issuer
7480975	Other	NY	GHI
P2364003	Other	NY	OXFORD

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 is the NPI number for Barbara Markowitz?

The National Provider Identifier (NPI) for Barbara Markowitz is 1255452504, a Type 1 (individual) record in the CMS NPPES registry.

Where does Barbara Markowitz practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-08-22.