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

Sylvia V Herdt, LCSW

Clinical Social Worker in Sewickley, PA · enumerated 2006.

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

National Provider Identifier

1023033990

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Registry record

Entity type Individual (Type 1)
Name Sylvia V Herdt
Credential LCSW
Sex Female
Practice address Sewickley, PA, 15143
Phone (724) 272-1984
Fax (153) 082-0619
Enumeration date Jul 13, 2006
Last updated in NPPES Nov 15, 2013

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 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
631569 Other PA HIGHMARK
202856 Other - UPMC
673053 Other PA BLUE CROSS BLUE SHIELD PA

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

What is the NPI number for Sylvia Herdt?
The National Provider Identifier (NPI) for Sylvia Herdt is 1023033990, a Type 1 (individual) record in the CMS NPPES registry.
Where does Sylvia Herdt practice?
The practice location on file with NPPES is in Sewickley, PA. 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 2013-11-15.