Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Agnieszka Katarzyna Kowalska, MD

Neurology Physician in Stony Brook, NY · enumerated 2008 · practices at Stonybrook University Hospital.

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

National Provider Identifier

1538320189

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Registry record

Entity type Individual (Type 1)

Name Mrs. Agnieszka Katarzyna Kowalska

Credential MD

Sex Female

Practice address Stony Brook University Hospital, Dept of Neurology Hsc T12 020, Stony Brook, NY, 11794

Phone (631) 444-2599

Fax (631) 444-1474

Enumeration date Jun 17, 2008

Last updated in NPPES Oct 18, 2013

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 248640 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 Agnieszka Kowalska practice?

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

What is the NPI number for Agnieszka Kowalska?

The National Provider Identifier (NPI) for Agnieszka Kowalska is 1538320189, 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 2013-10-18.