Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Agnieszka (Agnes) Siarkowska

Professional Counselor in Gaithersburg, MD · enumerated 2026.

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

National Provider Identifier

1740103639

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Registry record

Entity type Individual (Type 1)

Name Agnieszka (Agnes) Siarkowska

Sex Female

Practice address 16220 Frederick Rd Ste 310, Gaithersburg, MD, 20877

Phone (301) 345-1022

Fax (301) 560-5558

Enumeration date Jul 30, 2026

Last updated in NPPES Jul 30, 2026

Taxonomy & licenses

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 18112 (MD) 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

Where does Agnieszka (Agnes) Siarkowska practice?

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

What is the NPI number for Agnieszka (Agnes) Siarkowska?

The National Provider Identifier (NPI) for Agnieszka (Agnes) Siarkowska is 1740103639, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-07-30.