Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark William Lesniewski
Mental Health Counselor in Erie, PA · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1790212975
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Registry record
Entity type Individual (Type 1)
Name Mark William Lesniewski
Sex Male
Practice address 3800 W 12th St Ste 7, Erie, PA, 16505
Phone (814) 482-2209
Enumeration date May 18, 2017
Last updated in NPPES May 25, 2023
Taxonomy & licenses
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
Where does Mark Lesniewski practice?
The practice location on file with NPPES is in Erie, PA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Lesniewski?
The National Provider Identifier (NPI) for Mark Lesniewski is 1790212975, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-25.