Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Leslie A. Greskowiak, APN-CNP
Nurse Practitioner in Hinsdale, IL · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1164998332
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Registry record
Entity type Individual (Type 1)
Name Leslie A. Greskowiak
Credential APN-CNP
Sex Female
Practice address 8 Salt Creek Ln Ste 301, Hinsdale, IL, 60521
Phone (331) 221-2550
Enumeration date Oct 15, 2018
Last updated in NPPES May 12, 2026
Taxonomy & licenses
363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209018380 (IL) Primary
363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209.018380 (IL) Secondary
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.
Frequently asked questions
What specialty is Leslie Greskowiak?
Leslie Greskowiak is registered in NPPES with the primary taxonomy of Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-12.